Hi,
On Sat, Feb 28, 2026 at 8:57 AM Masahiko Sawada <[email protected]> wrote:
>
> IIUC earlier patches defined autovacuum_max_parallel_workers with the
> limit by max_worker_processes. Suppose we set:
>
> - max_worker_processes = 8
> - autovacuum_max_parallel_workers = 4
> - max_parallel_workers = 4
>
> If we want to disable all parallel operations, we would need to set
> max_parallel_workers to 0 as well as either
> autovacuum_max_parallel_workers to 0, no? This is because if we set
> only max_parallel_workers to 0, autovacuum workers still can take
> parallel vacuum workers from the max_worker_processes pool. I might be
> missing something though.
>
Even if av_max_parallel_workers is limited by max_worker_processes,
it is enough to set max_parallel_workers to 0 to disable parallel
autovacuum.
When a/v leader wants to create supportive workers, it calls
"RegisterDynamicBackgroundWorker" function, which contain following
logic :
/*
* If this is a parallel worker, check whether there are already too many
* parallel workers; if so, don't register another one.
*/
if (parallel && (BackgroundWorkerData->parallel_register_count -
BackgroundWorkerData->parallel_terminate_count) >=
max_parallel_workers)
{
....
}
Thus, a/v leader cannot launch any workers if max_parallel_workers is set to 0.
> > > If we write the log "%d parallel autovacuum workers have been
> > > released" in AutoVacuumReleaseParallelWorkres(), can we simplify both
> > > tests (4 and 5) further?
> > >
> >
> > It won't help the 4th test, because ReleaseParallelWorkers is called
> > due to both ERROR and shmem_exit, but we want to be sure that
> > workers are released in the try/catch block (i.e. before the shmem_exit).
>
> We already call AutoVacuumReleaseAllParallelWorker() in the PG_CATCH()
> block in do_autovacuum(). If we write the log in
> AutoVacuumReleaseParallelWorkers(), the tap test is able to check the
> log, no?
>
Not quite. Assume that we add "%d workers have been released" log to the
ReleaseAllParallelWorkers. Then we trigger an error for a/v leader and wait
for this log (we are expecting that workers will be released inside the
try/catch block).
Even if there is a bug in the code and a/v leader cannot release parallel
workers due to occured error, one day it will finish vacuuming and call
"proc_exit". During "proc_exit" the "before_shmem_exit_hook" along with
the "ReleaseAllParallelWorkers" will be called.
I.e. we will see the desired log, and we will mistakenly consider this test
passed.
> > Also, I don't know whether the 5th test needs this log at all, because in
> > the end we are checking the number of free parallel workers. If a killed
> > a/v leader doesn't release parallel workers, we'll notice it.
>
> If we can check the log written at process shutdown time, I think we
> can somewhat simplify the test 5 logic by not attaching
> 'autovacuum-start-parallel-vacuum' injection point.
>
> 1. attach 'autovacuum-leader-before-indexes-processing' injection point.
> 2. wait for an av worker to stop at the injection point.
> 3. terminate the av worker.
> 4. verify from the log if the workers have been released.
> 5. disable parallel autovacuum.
> 6. check the free workers (should be 10).
>
> Step 5 and 6 seems to be optional though.
OK, I see your point. But I'm afraid that the "%d released" log can't help
us here for the reason I described above :
"%d released" can be called from several places and we cannot be sure
which one has emitted this log.
I suppose to do the same as we did for try/catch block - add logging inside
the "autovacuum_worker_before_shmem_exit" with some unique message.
Thus, we will be sure that the workers are released precisely in the
"before_shmem_exit_hook".
The alternative is to pass some additional information to the
"ReleaseAllParallelWorkers" function (to supplement the log it emits), but it
doesn't seem like a good solution to me.
**Comments on the 0001 patch**
> + /*
> + * Max number of parallel autovacuum workers. If value is 0 then parallel
> + * degree will computed based on number of indexes.
> + */
> + int autovacuum_parallel_workers;
>
> I'm a bit concerned that the above description doesn't explain what
> number of parallel vacuum workers are used in >0 as it mentioned only
> the maximum number. How about rewording it to:
>
> Target number of parallel autovacuum workers. -1 by default disables
> parallel vacuum during autovacuum. 0 means choose the parallel degree
> based on the number of indexes.
>
I agree.
**Comments on the 0002 patch**
> + PVWorkersUsage workers_usage;
> /* Counters that follow are only for scanned_pages */
> int64 tuples_deleted; /* # deleted from table */
>
> Let's insert a new line between the new line and the existing line.
>
OK
> + if (AmAutoVacuumWorkerProcess())
> + {
> + /* Worker usage stats for parallel autovacuum. */
> + appendStringInfo(&buf,
> + _("parallel workers: index
> vacuum: %d planned, %d reserved, %d launched in total\n"),
> + vacrel->workers_usage.vacuum.nplanned,
> + vacrel->workers_usage.vacuum.nreserved,
> + vacrel->workers_usage.vacuum.nlaunched);
> + }
> + else
> + {
> + /* Worker usage stats for manual VACUUM (PARALLEL). */
> + appendStringInfo(&buf,
> + _("parallel workers: index
> vacuum: %d planned, %d launched in total\n"),
> + vacrel->workers_usage.vacuum.nplanned,
> + vacrel->workers_usage.vacuum.nlaunched);
> + }
> + }
>
> These comments are very obvious so I don't think we need them.
I agree.
> Instead, I think it would be good to explain why we don't need to
> report "reserved" numbers in the manual vacuum cases.
>
I think that we can clarify somewhere why the "reserved" statistic
is collected only for autovacuum. PVWorkersStats is an appropriate
place for it. Thus, there will be no need to write something during
constructing the log.
> ---
> + if (vacrel->workers_usage.vacuum.nplanned > 0)
> + {
> + /* Stats for vacuum phase of index vacuuming. */
>
> and
>
> + if (vacrel->workers_usage.cleanup.nplanned > 0)
> + {
> + /* Stats for cleanup phase of index vacuuming. */
> +
>
> I don't think we need these comments (the second one has a typo
> though) as it's obvious.
>
I agree.
> */
> void
> parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long
> num_table_tuples,
> - int num_index_scans)
> + int num_index_scans, PVWorkersUsage
> *wusage)
>
> Please add a brief description of wusage to the function comment. We
> can add comments to both parallel_vacuum_bulkldel_all_indexes() and
> parallel_vacuum_cleanup_all_indexes() or only
> parallel_vacuum_process_all_indexes().
>
OK. I think that adding a comment only to the
parallel_vacuum_process_all_indexes will be more appropriate.
(I'm not sure if the comment I came up with looks good, but I couldn't
formulate it better).
>
> PVWorkersUsage is added twice
>
Oops
**Comments on the 0003 patch**
>
> +#define VacCostParamsEquals(params) \
> + (vacuum_cost_delay == (params).cost_delay && \
> + vacuum_cost_limit == (params).cost_limit && \
> + VacuumCostPageDirty == (params).cost_page_dirty && \
> + VacuumCostPageHit == (params).cost_page_hit && \
> + VacuumCostPageMiss == (params).cost_page_miss)
>
> I'm not sure this macro helps reduce lines of code or improve
> readability as it's used only once and it's slightly unnatural to me
> that *Equals macro takes only one argument.
>
I agree, it looks a bit odd. I'll remove it.
Moreover, this shmem state can be updated only by the a/v leader worker,
so I'll allow it to read shared variables without holding a spinlock.
It seems pretty reliable, what do you think?
**Comments on the 0004 patch**
> +#include "commands/vacuum.h"
> +#include "fmgr.h"
> +#include "miscadmin.h"
> +#include "postmaster/autovacuum.h"
> +#include "storage/shmem.h"
> +#include "storage/ipc.h"
> +#include "storage/lwlock.h"
> +#include "utils/builtins.h"
> +#include "utils/injection_point.h"
>
> We can remove some unnecessary header includes. ISTM we need only
> fmgr.h, autovacuum.h, and injection_point.h.
>
Agree, I'll remove unused includes.
> + const char *msg_format =
> + _("Parallel autovacuum worker cost params: cost_limit=%d,
> cost_delay=%g, cost_page_miss=%d, cost_page_dirty=%d,
> cost_page_hit=%d");
> +
>
> I don't think we need the translation for this message as it's not a
> user-facing one.
>
> We don't capitalize the first letter in the error message.
>
I agree.
> ---
> + ereport(DEBUG2,
> + (errmsg("number of free parallel autovacuum workers is set
> to %u due to config reload",
> + AutoVacuumShmem->av_freeParallelWorkers),
> + errhidecontext(true)));
>
> Why do we need to add errhidecontext(true) here?
>
I thought we don't need to write redundant info to the logfile. But I
don't see that other DEBUG2 messages are hiding context, so
I'll remove it.
BTW, do we want to use "elog" here too?
> ---
> + 'tests': [
> + 't/001_basic.pl',
> + ],
>
> Need to be updated to the new filename.
>
> ---
> + * Copyright (c) 2020-2025, PostgreSQL Global Development Group
>
> Please update the copyright years.
>
Yeah, I forgot about it. Will fix it.
Thank you very much for the review!
Please, see the updated set of patches.
--
Best regards,
Daniil Davydov
From f91c52c22340349f9c2459ff565408e75b4d9197 Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Thu, 15 Jan 2026 23:15:48 +0700
Subject: [PATCH v23 3/5] Cost based parameters propagation for parallel
autovacuum
---
src/backend/commands/vacuum.c | 23 +++-
src/backend/commands/vacuumparallel.c | 163 ++++++++++++++++++++++++++
src/backend/postmaster/autovacuum.c | 2 +-
src/include/commands/vacuum.h | 2 +
src/tools/pgindent/typedefs.list | 2 +
5 files changed, 189 insertions(+), 3 deletions(-)
diff --git a/src/backend/commands/vacuum.c b/src/backend/commands/vacuum.c
index 03932f45c8a..70882544d05 100644
--- a/src/backend/commands/vacuum.c
+++ b/src/backend/commands/vacuum.c
@@ -2430,8 +2430,21 @@ vacuum_delay_point(bool is_analyze)
/* Always check for interrupts */
CHECK_FOR_INTERRUPTS();
- if (InterruptPending ||
- (!VacuumCostActive && !ConfigReloadPending))
+ if (InterruptPending)
+ return;
+
+ if (IsParallelWorker())
+ {
+ /*
+ * Possibly update cost-based delay parameters.
+ *
+ * Do it before checking VacuumCostActive, because its value might be
+ * changed after calling this function.
+ */
+ parallel_vacuum_update_shared_delay_params();
+ }
+
+ if (!VacuumCostActive && !ConfigReloadPending)
return;
/*
@@ -2445,6 +2458,12 @@ vacuum_delay_point(bool is_analyze)
ConfigReloadPending = false;
ProcessConfigFile(PGC_SIGHUP);
VacuumUpdateCosts();
+
+ /*
+ * If we are parallel autovacuum leader and some of cost-based
+ * parameters had changed, let other parallel workers know.
+ */
+ parallel_vacuum_propagate_shared_delay_params();
}
/*
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 643849b2fb8..80b57bf9da3 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -54,6 +54,52 @@
#define PARALLEL_VACUUM_KEY_WAL_USAGE 4
#define PARALLEL_VACUUM_KEY_INDEX_STATS 5
+/*
+ * Helper for the PVSharedCostParams structure (see below), to avoid
+ * repetition.
+ */
+typedef struct VacuumCostParams
+{
+ double cost_delay;
+ int cost_limit;
+ int cost_page_dirty;
+ int cost_page_hit;
+ int cost_page_miss;
+} VacuumCostParams;
+
+#define FillVacCostParams(cost_params) \
+ (cost_params)->cost_delay = vacuum_cost_delay; \
+ (cost_params)->cost_limit = vacuum_cost_limit; \
+ (cost_params)->cost_page_dirty = VacuumCostPageDirty; \
+ (cost_params)->cost_page_hit = VacuumCostPageHit; \
+ (cost_params)->cost_page_miss = VacuumCostPageMiss
+
+/*
+ * Struct for cost-based vacuum delay related parameters to share among an
+ * autovacuum worker and its parallel vacuum workers.
+ */
+typedef struct PVSharedCostParams
+{
+ /*
+ * Each time leader worker updates its parameters, it must increase
+ * generation. Every parallel worker keeps the generation
+ * (shared_params_local_generation) at which it had last time received
+ * parameters from the leader.
+ *
+ * It is enough for worker to compare it's local_generation with the field
+ * below to determine whether it needs to receive new parameters' values.
+ */
+ pg_atomic_uint32 generation;
+
+ slock_t mutex; /* protects all fields below */
+
+ /*
+ * Copies of the corresponding cost-based vacuum delay parameters from
+ * autovacuum leader process.
+ */
+ VacuumCostParams params_data;
+} PVSharedCostParams;
+
/*
* Shared information among parallel workers. So this is allocated in the DSM
* segment.
@@ -123,6 +169,18 @@ typedef struct PVShared
/* Statistics of shared dead items */
VacDeadItemsInfo dead_items_info;
+
+ /*
+ * If 'true' then we are running parallel autovacuum. Otherwise, we are
+ * running parallel maintenence VACUUM.
+ */
+ bool is_autovacuum;
+
+ /*
+ * Struct for syncing cost-based vacuum delay parameters between
+ * supportive parallel autovacuum workers with leader worker.
+ */
+ PVSharedCostParams cost_params;
} PVShared;
/* Status used during parallel index vacuum or cleanup */
@@ -225,6 +283,11 @@ struct ParallelVacuumState
PVIndVacStatus status;
};
+static PVSharedCostParams *pv_shared_cost_params = NULL;
+
+/* See comments for the PVSharedCostParams structure for the explanation. */
+static uint32 shared_params_generation_local = 0;
+
static int parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested,
bool *will_parallel_vacuum);
static void parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scans,
@@ -396,6 +459,17 @@ parallel_vacuum_init(Relation rel, Relation *indrels, int nindexes,
pg_atomic_init_u32(&(shared->active_nworkers), 0);
pg_atomic_init_u32(&(shared->idx), 0);
+ shared->is_autovacuum = AmAutoVacuumWorkerProcess();
+
+ if (shared->is_autovacuum)
+ {
+ FillVacCostParams(&shared->cost_params.params_data);
+ pg_atomic_init_u32(&shared->cost_params.generation, 0);
+ SpinLockInit(&shared->cost_params.mutex);
+
+ pv_shared_cost_params = &(shared->cost_params);
+ }
+
shm_toc_insert(pcxt->toc, PARALLEL_VACUUM_KEY_SHARED, shared);
pvs->shared = shared;
@@ -540,6 +614,92 @@ parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs, long num_table_tup
&wusage->cleanup);
}
+/*
+ * If we are parallel *autovacuum* worker, check whether related to cost-based
+ * vacuum delay parameters had changed in the leader worker. If so,
+ * corresponding parameters will be updated to the values which leader worker
+ * is operating on.
+ *
+ * For non-autovacuum parallel worker this function will have no effect.
+ */
+void
+parallel_vacuum_update_shared_delay_params(void)
+{
+ uint32 params_generation;
+
+ Assert(IsParallelWorker());
+
+ /* Check whether we are running parallel autovacuum */
+ if (pv_shared_cost_params == NULL)
+ return;
+
+ params_generation = pg_atomic_read_u32(&pv_shared_cost_params->generation);
+ Assert(shared_params_generation_local <= params_generation);
+
+ /* Return if parameters had not changed in the leader */
+ if (params_generation == shared_params_generation_local)
+ return;
+
+ SpinLockAcquire(&pv_shared_cost_params->mutex);
+
+ VacuumCostDelay = pv_shared_cost_params->params_data.cost_delay;
+ VacuumCostLimit = pv_shared_cost_params->params_data.cost_limit;
+ VacuumCostPageDirty = pv_shared_cost_params->params_data.cost_page_dirty;
+ VacuumCostPageHit = pv_shared_cost_params->params_data.cost_page_hit;
+ VacuumCostPageMiss = pv_shared_cost_params->params_data.cost_page_miss;
+
+ SpinLockRelease(&pv_shared_cost_params->mutex);
+
+ VacuumUpdateCosts();
+
+ shared_params_generation_local = params_generation;
+}
+
+/*
+ * Function to be called from parallel autovacuum leader in order to propagate
+ * some cost-based vacuum delay parameters to the supportive workers.
+ */
+void
+parallel_vacuum_propagate_shared_delay_params(void)
+{
+ VacuumCostParams *params_data;
+
+ Assert(AmAutoVacuumWorkerProcess());
+
+ /* Check whether we are running parallel autovacuum */
+ if (pv_shared_cost_params == NULL)
+ return;
+
+ /*
+ * Only leader worker can modify this shared structure, so we can read it
+ * without acquiring a lock.
+ */
+ params_data = &pv_shared_cost_params->params_data;
+
+ if (vacuum_cost_delay == params_data->cost_delay &&
+ vacuum_cost_limit == params_data->cost_limit &&
+ VacuumCostPageDirty == params_data->cost_page_dirty &&
+ VacuumCostPageHit == params_data->cost_page_hit &&
+ VacuumCostPageMiss == params_data->cost_page_miss)
+ {
+ /*
+ * We don't need to update shared cost-based vacuum delay params if
+ * they haven't changed.
+ */
+ return;
+ }
+
+ SpinLockAcquire(&pv_shared_cost_params->mutex);
+ FillVacCostParams(&pv_shared_cost_params->params_data);
+ SpinLockRelease(&pv_shared_cost_params->mutex);
+
+ /*
+ * Increase generation of the parameters, i.e. let parallel workers know
+ * that they should re-read shared cost params.
+ */
+ pg_atomic_fetch_add_u32(&pv_shared_cost_params->generation, 1);
+}
+
/*
* Compute the number of parallel worker processes to request. Both index
* vacuum and index cleanup can be executed with parallel workers.
@@ -1109,6 +1269,9 @@ parallel_vacuum_main(dsm_segment *seg, shm_toc *toc)
VacuumSharedCostBalance = &(shared->cost_balance);
VacuumActiveNWorkers = &(shared->active_nworkers);
+ if (shared->is_autovacuum)
+ pv_shared_cost_params = &(shared->cost_params);
+
/* Set parallel vacuum state */
pvs.indrels = indrels;
pvs.nindexes = nindexes;
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index f40abe90ed5..0d78d02bd09 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -1690,7 +1690,7 @@ VacuumUpdateCosts(void)
}
else
{
- /* Must be explicit VACUUM or ANALYZE */
+ /* Must be explicit VACUUM or ANALYZE or parallel autovacuum worker */
vacuum_cost_delay = VacuumCostDelay;
vacuum_cost_limit = VacuumCostLimit;
}
diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h
index 1b1fb625cb2..4bfeba8264d 100644
--- a/src/include/commands/vacuum.h
+++ b/src/include/commands/vacuum.h
@@ -434,6 +434,8 @@ extern void parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs,
int num_index_scans,
bool estimated_count,
PVWorkersUsage *wusage);
+extern void parallel_vacuum_update_shared_delay_params(void);
+extern void parallel_vacuum_propagate_shared_delay_params(void);
extern void parallel_vacuum_main(dsm_segment *seg, shm_toc *toc);
/* in commands/analyze.c */
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 536237ff546..de9f576e0f3 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -2070,6 +2070,7 @@ PVIndStats
PVIndVacStatus
PVOID
PVShared
+PVSharedCostParams
PVWorkersUsage
PVWorkersStats
PX_Alias
@@ -3249,6 +3250,7 @@ VacAttrStatsP
VacDeadItemsInfo
VacErrPhase
VacOptValue
+VacuumCostParams
VacuumParams
VacuumRelation
VacuumStmt
--
2.43.0
From 4b4fe2edb57dc6d910dc7a37161bede4e752d982 Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sun, 23 Nov 2025 01:07:47 +0700
Subject: [PATCH v23 2/5] Logging for parallel autovacuum
---
src/backend/access/heap/vacuumlazy.c | 54 ++++++++++++++++++++++++++-
src/backend/commands/vacuumparallel.c | 32 +++++++++++++---
src/include/commands/vacuum.h | 39 ++++++++++++++++++-
src/tools/pgindent/typedefs.list | 2 +
4 files changed, 117 insertions(+), 10 deletions(-)
diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c
index 5d271d80967..1e2d5be1af2 100644
--- a/src/backend/access/heap/vacuumlazy.c
+++ b/src/backend/access/heap/vacuumlazy.c
@@ -342,6 +342,13 @@ typedef struct LVRelState
int num_index_scans;
int num_dead_items_resets;
Size total_dead_items_bytes;
+
+ /*
+ * Total number of planned and actually launched parallel workers for
+ * index scans.
+ */
+ PVWorkersUsage workers_usage;
+
/* Counters that follow are only for scanned_pages */
int64 tuples_deleted; /* # deleted from table */
int64 tuples_frozen; /* # newly frozen */
@@ -780,6 +787,11 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
vacrel->new_all_visible_all_frozen_pages = 0;
vacrel->new_all_frozen_pages = 0;
+ vacrel->workers_usage.vacuum.nlaunched = 0;
+ vacrel->workers_usage.vacuum.nplanned = 0;
+ vacrel->workers_usage.cleanup.nlaunched = 0;
+ vacrel->workers_usage.cleanup.nplanned = 0;
+
/*
* Get cutoffs that determine which deleted tuples are considered DEAD,
* not just RECENTLY_DEAD, and which XIDs/MXIDs to freeze. Then determine
@@ -1122,6 +1134,42 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
orig_rel_pages == 0 ? 100.0 :
100.0 * vacrel->lpdead_item_pages / orig_rel_pages,
vacrel->lpdead_items);
+ if (vacrel->workers_usage.vacuum.nplanned > 0)
+ {
+ if (AmAutoVacuumWorkerProcess())
+ {
+ appendStringInfo(&buf,
+ _("parallel workers: index vacuum: %d planned, %d reserved, %d launched in total\n"),
+ vacrel->workers_usage.vacuum.nplanned,
+ vacrel->workers_usage.vacuum.nreserved,
+ vacrel->workers_usage.vacuum.nlaunched);
+ }
+ else
+ {
+ appendStringInfo(&buf,
+ _("parallel workers: index vacuum: %d planned, %d launched in total\n"),
+ vacrel->workers_usage.vacuum.nplanned,
+ vacrel->workers_usage.vacuum.nlaunched);
+ }
+ }
+ if (vacrel->workers_usage.cleanup.nplanned > 0)
+ {
+ if (AmAutoVacuumWorkerProcess())
+ {
+ appendStringInfo(&buf,
+ _("parallel workers: index cleanup: %d planned, %d reserved, %d launched\n"),
+ vacrel->workers_usage.cleanup.nplanned,
+ vacrel->workers_usage.cleanup.nreserved,
+ vacrel->workers_usage.cleanup.nlaunched);
+ }
+ else
+ {
+ appendStringInfo(&buf,
+ _("parallel workers: index cleanup: %d planned, %d launched\n"),
+ vacrel->workers_usage.cleanup.nplanned,
+ vacrel->workers_usage.cleanup.nlaunched);
+ }
+ }
for (int i = 0; i < vacrel->nindexes; i++)
{
IndexBulkDeleteResult *istat = vacrel->indstats[i];
@@ -2666,7 +2714,8 @@ lazy_vacuum_all_indexes(LVRelState *vacrel)
{
/* Outsource everything to parallel variant */
parallel_vacuum_bulkdel_all_indexes(vacrel->pvs, old_live_tuples,
- vacrel->num_index_scans);
+ vacrel->num_index_scans,
+ &vacrel->workers_usage);
/*
* Do a postcheck to consider applying wraparound failsafe now. Note
@@ -3099,7 +3148,8 @@ lazy_cleanup_all_indexes(LVRelState *vacrel)
/* Outsource everything to parallel variant */
parallel_vacuum_cleanup_all_indexes(vacrel->pvs, reltuples,
vacrel->num_index_scans,
- estimated_count);
+ estimated_count,
+ &vacrel->workers_usage);
}
/* Reset the progress counters */
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 806a7f48326..643849b2fb8 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -228,7 +228,7 @@ struct ParallelVacuumState
static int parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested,
bool *will_parallel_vacuum);
static void parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scans,
- bool vacuum);
+ bool vacuum, PVWorkersStats *wstats);
static void parallel_vacuum_process_safe_indexes(ParallelVacuumState *pvs);
static void parallel_vacuum_process_unsafe_indexes(ParallelVacuumState *pvs);
static void parallel_vacuum_process_one_index(ParallelVacuumState *pvs, Relation indrel,
@@ -503,7 +503,7 @@ parallel_vacuum_reset_dead_items(ParallelVacuumState *pvs)
*/
void
parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long num_table_tuples,
- int num_index_scans)
+ int num_index_scans, PVWorkersUsage *wusage)
{
Assert(!IsParallelWorker());
@@ -514,7 +514,8 @@ parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long num_table_tup
pvs->shared->reltuples = num_table_tuples;
pvs->shared->estimated_count = true;
- parallel_vacuum_process_all_indexes(pvs, num_index_scans, true);
+ parallel_vacuum_process_all_indexes(pvs, num_index_scans, true,
+ &wusage->vacuum);
}
/*
@@ -522,7 +523,8 @@ parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs, long num_table_tup
*/
void
parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs, long num_table_tuples,
- int num_index_scans, bool estimated_count)
+ int num_index_scans, bool estimated_count,
+ PVWorkersUsage *wusage)
{
Assert(!IsParallelWorker());
@@ -534,7 +536,8 @@ parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs, long num_table_tup
pvs->shared->reltuples = num_table_tuples;
pvs->shared->estimated_count = estimated_count;
- parallel_vacuum_process_all_indexes(pvs, num_index_scans, false);
+ parallel_vacuum_process_all_indexes(pvs, num_index_scans, false,
+ &wusage->cleanup);
}
/*
@@ -616,10 +619,13 @@ parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested,
/*
* Perform index vacuum or index cleanup with parallel workers. This function
* must be used by the parallel vacuum leader process.
+ *
+ * If wstats is not NULL, the statistics it stores will be updated according
+ * to what happens during function execution.
*/
static void
parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scans,
- bool vacuum)
+ bool vacuum, PVWorkersStats *wstats)
{
int nworkers;
PVIndVacStatus new_status;
@@ -656,13 +662,23 @@ parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scan
*/
nworkers = Min(nworkers, pvs->pcxt->nworkers);
+ /* Remember this value, if we asked to */
+ if (wstats != NULL && nworkers > 0)
+ wstats->nplanned += nworkers;
+
/*
* Reserve workers in autovacuum global state. Note that we may be given
* fewer workers than we requested.
*/
if (AmAutoVacuumWorkerProcess() && nworkers > 0)
+ {
AutoVacuumReserveParallelWorkers(&nworkers);
+ /* Remember this value, if we asked to */
+ if (wstats != NULL)
+ wstats->nreserved += nworkers;
+ }
+
/*
* Set index vacuum status and mark whether parallel vacuum worker can
* process it.
@@ -729,6 +745,10 @@ parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scan
/* Enable shared cost balance for leader backend */
VacuumSharedCostBalance = &(pvs->shared->cost_balance);
VacuumActiveNWorkers = &(pvs->shared->active_nworkers);
+
+ /* Remember this value, if we asked to */
+ if (wstats != NULL)
+ wstats->nlaunched += pvs->pcxt->nworkers_launched;
}
if (vacuum)
diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h
index e885a4b9c77..1b1fb625cb2 100644
--- a/src/include/commands/vacuum.h
+++ b/src/include/commands/vacuum.h
@@ -300,6 +300,39 @@ typedef struct VacDeadItemsInfo
int64 num_items; /* current # of entries */
} VacDeadItemsInfo;
+/*
+ * Helper for the PVWorkersUsage structure (see below), to avoid repetition.
+ */
+typedef struct PVWorkersStats
+{
+ /* Number of parallel workers we are planned to launch */
+ int nplanned;
+
+ /*
+ * Number of parallel workers we have managed to reserve.
+ *
+ * Note, that we collect this stats only for the parallel *autovacuum*
+ * since during it we must reserve workers in shared state before actually
+ * trying to launch them (in order to meet the
+ * autovacuum_max_parallel_workers limit). Manual VACUUM (PARALLEL), on
+ * the contrary, doesn't need to reserve workers.
+ */
+ int nreserved;
+
+ /* Number of launched parallel workers */
+ int nlaunched;
+} PVWorkersStats;
+
+/*
+ * PVWorkersUsage stores information about total number of launched, reserved
+ * and planned workers during parallel vacuum (both for vacuum and cleanup).
+ */
+typedef struct PVWorkersUsage
+{
+ PVWorkersStats vacuum;
+ PVWorkersStats cleanup;
+} PVWorkersUsage;
+
/* GUC parameters */
extern PGDLLIMPORT int default_statistics_target; /* PGDLLIMPORT for PostGIS */
extern PGDLLIMPORT int vacuum_freeze_min_age;
@@ -394,11 +427,13 @@ extern TidStore *parallel_vacuum_get_dead_items(ParallelVacuumState *pvs,
extern void parallel_vacuum_reset_dead_items(ParallelVacuumState *pvs);
extern void parallel_vacuum_bulkdel_all_indexes(ParallelVacuumState *pvs,
long num_table_tuples,
- int num_index_scans);
+ int num_index_scans,
+ PVWorkersUsage *wusage);
extern void parallel_vacuum_cleanup_all_indexes(ParallelVacuumState *pvs,
long num_table_tuples,
int num_index_scans,
- bool estimated_count);
+ bool estimated_count,
+ PVWorkersUsage *wusage);
extern void parallel_vacuum_main(dsm_segment *seg, shm_toc *toc);
/* in commands/analyze.c */
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 77e3c04144e..536237ff546 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -2070,6 +2070,8 @@ PVIndStats
PVIndVacStatus
PVOID
PVShared
+PVWorkersUsage
+PVWorkersStats
PX_Alias
PX_Cipher
PX_Combo
--
2.43.0
From 24bef2b3e5736b363d113882fa9a53475c47fc36 Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sun, 23 Nov 2025 01:03:24 +0700
Subject: [PATCH v23 1/5] Parallel autovacuum
---
src/backend/access/common/reloptions.c | 11 ++
src/backend/commands/vacuumparallel.c | 42 ++++-
src/backend/postmaster/autovacuum.c | 164 +++++++++++++++++-
src/backend/utils/init/globals.c | 1 +
src/backend/utils/misc/guc.c | 8 +-
src/backend/utils/misc/guc_parameters.dat | 8 +
src/backend/utils/misc/postgresql.conf.sample | 1 +
src/bin/psql/tab-complete.in.c | 1 +
src/include/miscadmin.h | 1 +
src/include/postmaster/autovacuum.h | 5 +
src/include/utils/rel.h | 8 +
11 files changed, 240 insertions(+), 10 deletions(-)
diff --git a/src/backend/access/common/reloptions.c b/src/backend/access/common/reloptions.c
index 237ab8d0ed9..9459a010cc3 100644
--- a/src/backend/access/common/reloptions.c
+++ b/src/backend/access/common/reloptions.c
@@ -235,6 +235,15 @@ static relopt_int intRelOpts[] =
},
SPGIST_DEFAULT_FILLFACTOR, SPGIST_MIN_FILLFACTOR, 100
},
+ {
+ {
+ "autovacuum_parallel_workers",
+ "Maximum number of parallel autovacuum workers that can be used for processing this table.",
+ RELOPT_KIND_HEAP,
+ ShareUpdateExclusiveLock
+ },
+ -1, -1, 1024
+ },
{
{
"autovacuum_vacuum_threshold",
@@ -1968,6 +1977,8 @@ default_reloptions(Datum reloptions, bool validate, relopt_kind kind)
{"fillfactor", RELOPT_TYPE_INT, offsetof(StdRdOptions, fillfactor)},
{"autovacuum_enabled", RELOPT_TYPE_BOOL,
offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, enabled)},
+ {"autovacuum_parallel_workers", RELOPT_TYPE_INT,
+ offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, autovacuum_parallel_workers)},
{"autovacuum_vacuum_threshold", RELOPT_TYPE_INT,
offsetof(StdRdOptions, autovacuum) + offsetof(AutoVacOpts, vacuum_threshold)},
{"autovacuum_vacuum_max_threshold", RELOPT_TYPE_INT,
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 279108ca89f..806a7f48326 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -1,7 +1,9 @@
/*-------------------------------------------------------------------------
*
* vacuumparallel.c
- * Support routines for parallel vacuum execution.
+ * Support routines for parallel vacuum and autovacuum execution. In the
+ * comments below, the word "vacuum" will refer to both vacuum and
+ * autovacuum.
*
* This file contains routines that are intended to support setting up, using,
* and tearing down a ParallelVacuumState.
@@ -34,6 +36,7 @@
#include "executor/instrument.h"
#include "optimizer/paths.h"
#include "pgstat.h"
+#include "postmaster/autovacuum.h"
#include "storage/bufmgr.h"
#include "storage/proc.h"
#include "tcop/tcopprot.h"
@@ -374,8 +377,9 @@ parallel_vacuum_init(Relation rel, Relation *indrels, int nindexes,
shared->queryid = pgstat_get_my_query_id();
shared->maintenance_work_mem_worker =
(nindexes_mwm > 0) ?
- maintenance_work_mem / Min(parallel_workers, nindexes_mwm) :
- maintenance_work_mem;
+ vac_work_mem / Min(parallel_workers, nindexes_mwm) :
+ vac_work_mem;
+
shared->dead_items_info.max_bytes = vac_work_mem * (size_t) 1024;
/* Prepare DSA space for dead items */
@@ -554,12 +558,17 @@ parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested,
int nindexes_parallel_bulkdel = 0;
int nindexes_parallel_cleanup = 0;
int parallel_workers;
+ int max_workers;
+
+ max_workers = AmAutoVacuumWorkerProcess() ?
+ autovacuum_max_parallel_workers :
+ max_parallel_maintenance_workers;
/*
* We don't allow performing parallel operation in standalone backend or
* when parallelism is disabled.
*/
- if (!IsUnderPostmaster || max_parallel_maintenance_workers == 0)
+ if (!IsUnderPostmaster || max_workers == 0)
return 0;
/*
@@ -598,8 +607,8 @@ parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested,
parallel_workers = (nrequested > 0) ?
Min(nrequested, nindexes_parallel) : nindexes_parallel;
- /* Cap by max_parallel_maintenance_workers */
- parallel_workers = Min(parallel_workers, max_parallel_maintenance_workers);
+ /* Cap by GUC variable */
+ parallel_workers = Min(parallel_workers, max_workers);
return parallel_workers;
}
@@ -647,6 +656,13 @@ parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scan
*/
nworkers = Min(nworkers, pvs->pcxt->nworkers);
+ /*
+ * Reserve workers in autovacuum global state. Note that we may be given
+ * fewer workers than we requested.
+ */
+ if (AmAutoVacuumWorkerProcess() && nworkers > 0)
+ AutoVacuumReserveParallelWorkers(&nworkers);
+
/*
* Set index vacuum status and mark whether parallel vacuum worker can
* process it.
@@ -691,6 +707,16 @@ parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scan
LaunchParallelWorkers(pvs->pcxt);
+ /*
+ * Tell autovacuum that we could not launch all the previously
+ * reserved workers.
+ */
+ if (AmAutoVacuumWorkerProcess() &&
+ pvs->pcxt->nworkers_launched < nworkers)
+ {
+ AutoVacuumReleaseParallelWorkers(nworkers - pvs->pcxt->nworkers_launched);
+ }
+
if (pvs->pcxt->nworkers_launched > 0)
{
/*
@@ -739,6 +765,10 @@ parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scan
for (int i = 0; i < pvs->pcxt->nworkers_launched; i++)
InstrAccumParallelQuery(&pvs->buffer_usage[i], &pvs->wal_usage[i]);
+
+ /* Release all the reserved parallel workers for autovacuum */
+ if (AmAutoVacuumWorkerProcess() && pvs->pcxt->nworkers_launched > 0)
+ AutoVacuumReleaseAllParallelWorkers();
}
/*
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 6fde740465f..f40abe90ed5 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -151,6 +151,13 @@ int Log_autoanalyze_min_duration = 600000;
static double av_storage_param_cost_delay = -1;
static int av_storage_param_cost_limit = -1;
+/*
+ * Tracks the number of parallel workers currently reserved by the
+ * autovacuum worker. This is non-zero only for the parallel autovacuum
+ * leader process.
+ */
+static int av_nworkers_reserved = 0;
+
/* Flags set by signal handlers */
static volatile sig_atomic_t got_SIGUSR2 = false;
@@ -285,6 +292,8 @@ typedef struct AutoVacuumWorkItem
* av_workItems work item array
* av_nworkersForBalance the number of autovacuum workers to use when
* calculating the per worker cost limit
+ * av_freeParallelWorkers the number of free parallel autovacuum workers
+ * av_maxParallelWorkers the maximum number of parallel autovacuum workers
*
* This struct is protected by AutovacuumLock, except for av_signal and parts
* of the worker list (see above).
@@ -299,6 +308,8 @@ typedef struct
WorkerInfo av_startingWorker;
AutoVacuumWorkItem av_workItems[NUM_WORKITEMS];
pg_atomic_uint32 av_nworkersForBalance;
+ uint32 av_freeParallelWorkers;
+ uint32 av_maxParallelWorkers;
} AutoVacuumShmemStruct;
static AutoVacuumShmemStruct *AutoVacuumShmem;
@@ -361,6 +372,7 @@ static void autovac_report_workitem(AutoVacuumWorkItem *workitem,
static void avl_sigusr2_handler(SIGNAL_ARGS);
static bool av_worker_available(void);
static void check_av_worker_gucs(void);
+static void adjust_free_parallel_workers(int prev_max_parallel_workers);
@@ -759,6 +771,8 @@ ProcessAutoVacLauncherInterrupts(void)
if (ConfigReloadPending)
{
int autovacuum_max_workers_prev = autovacuum_max_workers;
+ int autovacuum_max_parallel_workers_prev =
+ autovacuum_max_parallel_workers;
ConfigReloadPending = false;
ProcessConfigFile(PGC_SIGHUP);
@@ -775,6 +789,15 @@ ProcessAutoVacLauncherInterrupts(void)
if (autovacuum_max_workers_prev != autovacuum_max_workers)
check_av_worker_gucs();
+ /*
+ * If autovacuum_max_parallel_workers changed, we must take care of
+ * the correct value of available parallel autovacuum workers in
+ * shmem.
+ */
+ if (autovacuum_max_parallel_workers_prev !=
+ autovacuum_max_parallel_workers)
+ adjust_free_parallel_workers(autovacuum_max_parallel_workers_prev);
+
/* rebuild the list in case the naptime changed */
rebuild_database_list(InvalidOid);
}
@@ -1379,6 +1402,16 @@ avl_sigusr2_handler(SIGNAL_ARGS)
* AUTOVACUUM WORKER CODE
********************************************************************/
+/*
+ * Make sure that all reserved workers are released, even if parallel
+ * autovacuum leader is finishing due to FATAL error.
+ */
+static void
+autovacuum_worker_before_shmem_exit(int code, Datum arg)
+{
+ AutoVacuumReleaseAllParallelWorkers();
+}
+
/*
* Main entry point for autovacuum worker processes.
*/
@@ -2275,6 +2308,12 @@ do_autovacuum(void)
"Autovacuum Portal",
ALLOCSET_DEFAULT_SIZES);
+ /*
+ * Parallel autovacuum can reserve parallel workers. Make sure that all
+ * reserved workers are released even after FATAL error.
+ */
+ before_shmem_exit(autovacuum_worker_before_shmem_exit, 0);
+
/*
* Perform operations on collected tables.
*/
@@ -2456,6 +2495,12 @@ do_autovacuum(void)
}
PG_CATCH();
{
+ /*
+ * Parallel autovacuum can reserve parallel workers. Make sure
+ * that all reserved workers are released.
+ */
+ AutoVacuumReleaseAllParallelWorkers();
+
/*
* Abort the transaction, start a new one, and proceed with the
* next table in our list.
@@ -2856,8 +2901,12 @@ table_recheck_autovac(Oid relid, HTAB *table_toast_map,
*/
tab->at_params.index_cleanup = VACOPTVALUE_UNSPECIFIED;
tab->at_params.truncate = VACOPTVALUE_UNSPECIFIED;
- /* As of now, we don't support parallel vacuum for autovacuum */
- tab->at_params.nworkers = -1;
+
+ /* Decide whether we need to process indexes of table in parallel. */
+ tab->at_params.nworkers = avopts
+ ? avopts->autovacuum_parallel_workers
+ : -1;
+
tab->at_params.freeze_min_age = freeze_min_age;
tab->at_params.freeze_table_age = freeze_table_age;
tab->at_params.multixact_freeze_min_age = multixact_freeze_min_age;
@@ -3334,6 +3383,88 @@ AutoVacuumRequestWork(AutoVacuumWorkItemType type, Oid relationId,
return result;
}
+/*
+ * Reserves parallel workers for autovacuum.
+ *
+ * nworkers is an in/out parameter; the requested number of parallel workers
+ * to reserve by the caller, and set to the actual number of reserved workers.
+ *
+ * The caller must call AutoVacuumRelease[All]ParallelWorkers() to release the
+ * reserved workers.
+ *
+ * NOTE: We will try to provide as many workers as requested, even if caller
+ * will occupy all available workers.
+ */
+void
+AutoVacuumReserveParallelWorkers(int *nworkers)
+{
+ /* Only leader autovacuum worker can call this function. */
+ Assert(AmAutoVacuumWorkerProcess());
+
+ /* The worker must not have any reserved workers yet */
+ Assert(av_nworkers_reserved == 0);
+
+ LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
+
+ /* Provide as many workers as we can. */
+ *nworkers = Min(AutoVacuumShmem->av_freeParallelWorkers, *nworkers);
+ AutoVacuumShmem->av_freeParallelWorkers -= *nworkers;
+
+ LWLockRelease(AutovacuumLock);
+
+ /* Remember how many workers we have reserved. */
+ av_nworkers_reserved = *nworkers;
+}
+
+/*
+ * Releases the reserved parallel workers for autovacuum.
+ *
+ * This function should be used to release the parallel workers that an
+ * autovacuum worker reserved by AutoVacuumReserveParallelWorkers(). nworkers
+ * is the number of workers to release, which must not be greater than the
+ * number of workers currently reserved, av_nworkers_reserved.
+ */
+void
+AutoVacuumReleaseParallelWorkers(int nworkers)
+{
+ /* Only leader worker can call this function. */
+ Assert(AmAutoVacuumWorkerProcess());
+
+ /* Cannot release more workers than reserved */
+ Assert(nworkers <= av_nworkers_reserved);
+
+ LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
+
+ /*
+ * If the maximum number of parallel workers was reduced during execution,
+ * we must cap available workers number by its new value.
+ */
+ AutoVacuumShmem->av_freeParallelWorkers =
+ Min(AutoVacuumShmem->av_freeParallelWorkers + nworkers,
+ AutoVacuumShmem->av_maxParallelWorkers);
+
+ LWLockRelease(AutovacuumLock);
+
+ /* Don't have to remember these workers anymore. */
+ av_nworkers_reserved -= nworkers;
+}
+
+/*
+ * Same as above, but this function releases all the parallel workers that
+ * this autovacuum worker reserved.
+ */
+void
+AutoVacuumReleaseAllParallelWorkers(void)
+{
+ /* Only leader worker can call this function. */
+ Assert(AmAutoVacuumWorkerProcess());
+
+ if (av_nworkers_reserved > 0)
+ AutoVacuumReleaseParallelWorkers(av_nworkers_reserved);
+
+ Assert(av_nworkers_reserved == 0);
+}
+
/*
* autovac_init
* This is called at postmaster initialization.
@@ -3394,6 +3525,10 @@ AutoVacuumShmemInit(void)
Assert(!found);
AutoVacuumShmem->av_launcherpid = 0;
+ AutoVacuumShmem->av_maxParallelWorkers =
+ Min(autovacuum_max_parallel_workers, max_parallel_workers);
+ AutoVacuumShmem->av_freeParallelWorkers =
+ AutoVacuumShmem->av_maxParallelWorkers;
dclist_init(&AutoVacuumShmem->av_freeWorkers);
dlist_init(&AutoVacuumShmem->av_runningWorkers);
AutoVacuumShmem->av_startingWorker = NULL;
@@ -3475,3 +3610,28 @@ check_av_worker_gucs(void)
errdetail("The server will only start up to \"autovacuum_worker_slots\" (%d) autovacuum workers at a given time.",
autovacuum_worker_slots)));
}
+
+/*
+ * Adjusts the number of free parallel workers corresponds to the new
+ * autovacuum_max_parallel_workers value.
+ */
+static void
+adjust_free_parallel_workers(int prev_max_parallel_workers)
+{
+ int nfree_workers;
+
+ LWLockAcquire(AutovacuumLock, LW_EXCLUSIVE);
+
+ /*
+ * Cap or increase number of free parallel workers according to the
+ * parameter change.
+ */
+ nfree_workers =
+ autovacuum_max_parallel_workers - prev_max_parallel_workers +
+ AutoVacuumShmem->av_freeParallelWorkers;
+
+ AutoVacuumShmem->av_freeParallelWorkers = Max(nfree_workers, 0);
+ AutoVacuumShmem->av_maxParallelWorkers = autovacuum_max_parallel_workers;
+
+ LWLockRelease(AutovacuumLock);
+}
diff --git a/src/backend/utils/init/globals.c b/src/backend/utils/init/globals.c
index 36ad708b360..8265a82b639 100644
--- a/src/backend/utils/init/globals.c
+++ b/src/backend/utils/init/globals.c
@@ -143,6 +143,7 @@ int NBuffers = 16384;
int MaxConnections = 100;
int max_worker_processes = 8;
int max_parallel_workers = 8;
+int autovacuum_max_parallel_workers = 2;
int MaxBackends = 0;
/* GUC parameters for vacuum */
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index d77502838c4..4a5c73a9e33 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -3326,9 +3326,13 @@ set_config_with_handle(const char *name, config_handle *handle,
*
* Also allow normal setting if the GUC is marked GUC_ALLOW_IN_PARALLEL.
*
- * Other changes might need to affect other workers, so forbid them.
+ * Other changes might need to affect other workers, so forbid them. Note,
+ * that parallel autovacuum leader is an exception, because only
+ * cost-based delays need to be affected also to parallel vacuum workers,
+ * and we will handle it elsewhere if appropriate.
*/
- if (IsInParallelMode() && changeVal && action != GUC_ACTION_SAVE &&
+ if (IsInParallelMode() && !AmAutoVacuumWorkerProcess() && changeVal &&
+ action != GUC_ACTION_SAVE &&
(record->flags & GUC_ALLOW_IN_PARALLEL) == 0)
{
ereport(elevel,
diff --git a/src/backend/utils/misc/guc_parameters.dat b/src/backend/utils/misc/guc_parameters.dat
index 9507778415d..92b69c65e83 100644
--- a/src/backend/utils/misc/guc_parameters.dat
+++ b/src/backend/utils/misc/guc_parameters.dat
@@ -154,6 +154,14 @@
max => '2000000000',
},
+{ name => 'autovacuum_max_parallel_workers', type => 'int', context => 'PGC_SIGHUP', group => 'VACUUM_AUTOVACUUM',
+ short_desc => 'Maximum number of parallel autovacuum workers, that can be taken from bgworkers pool.',
+ variable => 'autovacuum_max_parallel_workers',
+ boot_val => '2',
+ min => '0',
+ max => 'MAX_BACKENDS',
+},
+
{ name => 'autovacuum_max_workers', type => 'int', context => 'PGC_SIGHUP', group => 'VACUUM_AUTOVACUUM',
short_desc => 'Sets the maximum number of simultaneously running autovacuum worker processes.',
variable => 'autovacuum_max_workers',
diff --git a/src/backend/utils/misc/postgresql.conf.sample b/src/backend/utils/misc/postgresql.conf.sample
index f938cc65a3a..ef8126f3790 100644
--- a/src/backend/utils/misc/postgresql.conf.sample
+++ b/src/backend/utils/misc/postgresql.conf.sample
@@ -710,6 +710,7 @@
#autovacuum_worker_slots = 16 # autovacuum worker slots to allocate
# (change requires restart)
#autovacuum_max_workers = 3 # max number of autovacuum subprocesses
+#autovacuum_max_parallel_workers = 2 # limited by max_parallel_workers
#autovacuum_naptime = 1min # time between autovacuum runs
#autovacuum_vacuum_threshold = 50 # min number of row updates before
# vacuum
diff --git a/src/bin/psql/tab-complete.in.c b/src/bin/psql/tab-complete.in.c
index b2dba6d10ab..414c5e61db0 100644
--- a/src/bin/psql/tab-complete.in.c
+++ b/src/bin/psql/tab-complete.in.c
@@ -1423,6 +1423,7 @@ static const char *const table_storage_parameters[] = {
"autovacuum_multixact_freeze_max_age",
"autovacuum_multixact_freeze_min_age",
"autovacuum_multixact_freeze_table_age",
+ "autovacuum_parallel_workers",
"autovacuum_vacuum_cost_delay",
"autovacuum_vacuum_cost_limit",
"autovacuum_vacuum_insert_scale_factor",
diff --git a/src/include/miscadmin.h b/src/include/miscadmin.h
index f16f35659b9..00190c67ecf 100644
--- a/src/include/miscadmin.h
+++ b/src/include/miscadmin.h
@@ -178,6 +178,7 @@ extern PGDLLIMPORT int MaxBackends;
extern PGDLLIMPORT int MaxConnections;
extern PGDLLIMPORT int max_worker_processes;
extern PGDLLIMPORT int max_parallel_workers;
+extern PGDLLIMPORT int autovacuum_max_parallel_workers;
extern PGDLLIMPORT int commit_timestamp_buffers;
extern PGDLLIMPORT int multixact_member_buffers;
diff --git a/src/include/postmaster/autovacuum.h b/src/include/postmaster/autovacuum.h
index 5aa0f3a8ac1..f3783afb51b 100644
--- a/src/include/postmaster/autovacuum.h
+++ b/src/include/postmaster/autovacuum.h
@@ -62,6 +62,11 @@ pg_noreturn extern void AutoVacWorkerMain(const void *startup_data, size_t start
extern bool AutoVacuumRequestWork(AutoVacuumWorkItemType type,
Oid relationId, BlockNumber blkno);
+/* parallel autovacuum stuff */
+extern void AutoVacuumReserveParallelWorkers(int *nworkers);
+extern void AutoVacuumReleaseParallelWorkers(int nworkers);
+extern void AutoVacuumReleaseAllParallelWorkers(void);
+
/* shared memory stuff */
extern Size AutoVacuumShmemSize(void);
extern void AutoVacuumShmemInit(void);
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index 236830f6b93..11dd3aebc6c 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -311,6 +311,14 @@ typedef struct ForeignKeyCacheInfo
typedef struct AutoVacOpts
{
bool enabled;
+
+ /*
+ * Target number of parallel autovacuum workers. -1 by default disables
+ * parallel vacuum during autovacuum. 0 means choose the parallel degree
+ * based on the number of indexes.
+ */
+ int autovacuum_parallel_workers;
+
int vacuum_threshold;
int vacuum_max_threshold;
int vacuum_ins_threshold;
--
2.43.0
From d208fa25894c2c417091aee781df4fd7a45ecc90 Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sun, 23 Nov 2025 02:32:44 +0700
Subject: [PATCH v23 5/5] Documentation for parallel autovacuum
---
doc/src/sgml/config.sgml | 17 +++++++++++++++++
doc/src/sgml/maintenance.sgml | 12 ++++++++++++
doc/src/sgml/ref/create_table.sgml | 20 ++++++++++++++++++++
3 files changed, 49 insertions(+)
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index f670e2d4c31..07139ec7ff2 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -2918,6 +2918,7 @@ include_dir 'conf.d'
<para>
When changing this value, consider also adjusting
<xref linkend="guc-max-parallel-workers"/>,
+ <xref linkend="guc-autovacuum-max-parallel-workers"/>,
<xref linkend="guc-max-parallel-maintenance-workers"/>, and
<xref linkend="guc-max-parallel-workers-per-gather"/>.
</para>
@@ -9380,6 +9381,22 @@ COPY postgres_log FROM '/full/path/to/logfile.csv' WITH csv;
</listitem>
</varlistentry>
+ <varlistentry id="guc-autovacuum-max-parallel-workers" xreflabel="autovacuum_max_parallel_workers">
+ <term><varname>autovacuum_max_parallel_workers</varname> (<type>integer</type>)
+ <indexterm>
+ <primary><varname>autovacuum_max_parallel_workers</varname></primary>
+ <secondary>configuration parameter</secondary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ Sets the maximum number of parallel autovacuum workers that
+ can be used for parallel index vacuuming at one time. Is capped by
+ <xref linkend="guc-max-parallel-workers"/>. The default is 2.
+ </para>
+ </listitem>
+ </varlistentry>
+
</variablelist>
</sect2>
diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index 7c958b06273..c9f9163c551 100644
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -926,6 +926,18 @@ HINT: Execute a database-wide VACUUM in that database.
autovacuum workers' activity.
</para>
+ <para>
+ If an autovacuum worker process comes across a table with the enabled
+ <xref linkend="reloption-autovacuum-parallel-workers"/> storage parameter,
+ it will launch parallel workers in order to vacuum indexes of this table
+ in a parallel mode. Parallel workers are taken from the pool of processes
+ established by <xref linkend="guc-max-worker-processes"/>, limited by
+ <xref linkend="guc-max-parallel-workers"/>.
+ The total number of parallel autovacuum workers that can be active at one
+ time is limited by the <xref linkend="guc-autovacuum-max-parallel-workers"/>
+ configuration parameter.
+ </para>
+
<para>
If several large tables all become eligible for vacuuming in a short
amount of time, all autovacuum workers might become occupied with
diff --git a/doc/src/sgml/ref/create_table.sgml b/doc/src/sgml/ref/create_table.sgml
index 982532fe725..4894de021cd 100644
--- a/doc/src/sgml/ref/create_table.sgml
+++ b/doc/src/sgml/ref/create_table.sgml
@@ -1718,6 +1718,26 @@ WITH ( MODULUS <replaceable class="parameter">numeric_literal</replaceable>, REM
</listitem>
</varlistentry>
+ <varlistentry id="reloption-autovacuum-parallel-workers" xreflabel="autovacuum_parallel_workers">
+ <term><literal>autovacuum_parallel_workers</literal> (<type>integer</type>)
+ <indexterm>
+ <primary><varname>autovacuum_parallel_workers</varname> storage parameter</primary>
+ </indexterm>
+ </term>
+ <listitem>
+ <para>
+ Sets the maximum number of parallel autovacuum workers that can process
+ indexes of this table.
+ The default value is -1, which means no parallel index vacuuming for
+ this table. If value is 0 then parallel degree will computed based on
+ number of indexes.
+ Note that the computed number of workers may not actually be available at
+ run time. If this occurs, the autovacuum will run with fewer workers
+ than expected.
+ </para>
+ </listitem>
+ </varlistentry>
+
<varlistentry id="reloption-autovacuum-vacuum-threshold" xreflabel="autovacuum_vacuum_threshold">
<term><literal>autovacuum_vacuum_threshold</literal>, <literal>toast.autovacuum_vacuum_threshold</literal> (<type>integer</type>)
<indexterm>
--
2.43.0
From 438f0b699f63bdeee7e0da17859d401cc8df92da Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sun, 23 Nov 2025 01:08:14 +0700
Subject: [PATCH v23 4/5] Tests for parallel autovacuum
---
src/backend/access/heap/vacuumlazy.c | 9 +
src/backend/commands/vacuumparallel.c | 30 ++
src/backend/postmaster/autovacuum.c | 38 +++
src/include/postmaster/autovacuum.h | 1 +
src/test/modules/Makefile | 1 +
src/test/modules/meson.build | 1 +
src/test/modules/test_autovacuum/.gitignore | 2 +
src/test/modules/test_autovacuum/Makefile | 28 ++
src/test/modules/test_autovacuum/meson.build | 36 +++
.../t/001_parallel_autovacuum.pl | 299 ++++++++++++++++++
.../test_autovacuum/test_autovacuum--1.0.sql | 12 +
.../modules/test_autovacuum/test_autovacuum.c | 35 ++
.../test_autovacuum/test_autovacuum.control | 3 +
13 files changed, 495 insertions(+)
create mode 100644 src/test/modules/test_autovacuum/.gitignore
create mode 100644 src/test/modules/test_autovacuum/Makefile
create mode 100644 src/test/modules/test_autovacuum/meson.build
create mode 100644 src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl
create mode 100644 src/test/modules/test_autovacuum/test_autovacuum--1.0.sql
create mode 100644 src/test/modules/test_autovacuum/test_autovacuum.c
create mode 100644 src/test/modules/test_autovacuum/test_autovacuum.control
diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c
index 1e2d5be1af2..510e5846cd2 100644
--- a/src/backend/access/heap/vacuumlazy.c
+++ b/src/backend/access/heap/vacuumlazy.c
@@ -152,6 +152,7 @@
#include "storage/latch.h"
#include "storage/lmgr.h"
#include "storage/read_stream.h"
+#include "utils/injection_point.h"
#include "utils/lsyscache.h"
#include "utils/pg_rusage.h"
#include "utils/timestamp.h"
@@ -872,6 +873,14 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
lazy_check_wraparound_failsafe(vacrel);
dead_items_alloc(vacrel, params.nworkers);
+#ifdef USE_INJECTION_POINTS
+ /*
+ * Trigger injection point, if parallel autovacuum is about to be started.
+ */
+ if (AmAutoVacuumWorkerProcess() && ParallelVacuumIsActive(vacrel))
+ INJECTION_POINT("autovacuum-start-parallel-vacuum", NULL);
+#endif
+
/*
* Call lazy_scan_heap to perform all required heap pruning, index
* vacuuming, and heap vacuuming (plus related processing)
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 80b57bf9da3..1d352b44e44 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -40,6 +40,7 @@
#include "storage/bufmgr.h"
#include "storage/proc.h"
#include "tcop/tcopprot.h"
+#include "utils/injection_point.h"
#include "utils/lsyscache.h"
#include "utils/rel.h"
@@ -925,6 +926,19 @@ parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scan
pvs->pcxt->nworkers_launched, nworkers)));
}
+#ifdef USE_INJECTION_POINTS
+ /*
+ * To be able to exercise whether all reserved parallel workers are being
+ * released anyway, allow injection points to trigger a failure at this
+ * point.
+ *
+ * This injection point is also used to wait until parallel workers
+ * finishes their part of index processing.
+ */
+ if (nworkers > 0)
+ INJECTION_POINT("autovacuum-leader-before-indexes-processing", NULL);
+#endif
+
/* Vacuum the indexes that can be processed by only leader process */
parallel_vacuum_process_unsafe_indexes(pvs);
@@ -1302,6 +1316,22 @@ parallel_vacuum_main(dsm_segment *seg, shm_toc *toc)
/* Process indexes to perform vacuum/cleanup */
parallel_vacuum_process_safe_indexes(&pvs);
+#ifdef USE_INJECTION_POINTS
+ /*
+ * If we are parallel autovacuum worker, we can consume delay parameters
+ * during index processing (via vacuum_delay_point call). This logging
+ * allows tests to ensure this.
+ */
+ if (shared->is_autovacuum)
+ elog(DEBUG2,
+ "parallel autovacuum worker cost params: cost_limit=%d, cost_delay=%g, cost_page_miss=%d, cost_page_dirty=%d, cost_page_hit=%d",
+ vacuum_cost_limit,
+ vacuum_cost_delay,
+ VacuumCostPageMiss,
+ VacuumCostPageDirty,
+ VacuumCostPageHit);
+#endif
+
/* Report buffer/WAL usage during parallel execution */
buffer_usage = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_BUFFER_USAGE, false);
wal_usage = shm_toc_lookup(toc, PARALLEL_VACUUM_KEY_WAL_USAGE, false);
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 0d78d02bd09..d17fc92e783 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -1409,7 +1409,18 @@ avl_sigusr2_handler(SIGNAL_ARGS)
static void
autovacuum_worker_before_shmem_exit(int code, Datum arg)
{
+ int nreserved_old = av_nworkers_reserved;
+
AutoVacuumReleaseAllParallelWorkers();
+
+ if (nreserved_old > 0)
+ {
+ elog(DEBUG2,
+ ngettext("autovacuum worker before_shmem_exit: %d parallel worker has been released",
+ "autovacuum worker before_shmem_exit: %d parallel workers has been released",
+ nreserved_old - av_nworkers_reserved),
+ nreserved_old - av_nworkers_reserved);
+ }
}
/*
@@ -2495,12 +2506,20 @@ do_autovacuum(void)
}
PG_CATCH();
{
+ int nreserved_workers = av_nworkers_reserved;
+
/*
* Parallel autovacuum can reserve parallel workers. Make sure
* that all reserved workers are released.
*/
AutoVacuumReleaseAllParallelWorkers();
+ if (nreserved_workers > 0)
+ ereport(DEBUG2,
+ (errmsg("%d parallel autovacuum workers has been released after occured error",
+ nreserved_workers),
+ errhidecontext(true)));
+
/*
* Abort the transaction, start a new one, and proceed with the
* next table in our list.
@@ -3465,6 +3484,21 @@ AutoVacuumReleaseAllParallelWorkers(void)
Assert(av_nworkers_reserved == 0);
}
+/*
+ * Get number of free autovacuum parallel workers.
+ */
+uint32
+AutoVacuumGetFreeParallelWorkers(void)
+{
+ uint32 nfree_workers;
+
+ LWLockAcquire(AutovacuumLock, LW_SHARED);
+ nfree_workers = AutoVacuumShmem->av_freeParallelWorkers;
+ LWLockRelease(AutovacuumLock);
+
+ return nfree_workers;
+}
+
/*
* autovac_init
* This is called at postmaster initialization.
@@ -3633,5 +3667,9 @@ adjust_free_parallel_workers(int prev_max_parallel_workers)
AutoVacuumShmem->av_freeParallelWorkers = Max(nfree_workers, 0);
AutoVacuumShmem->av_maxParallelWorkers = autovacuum_max_parallel_workers;
+ elog(DEBUG2,
+ "number of free parallel autovacuum workers is set to %u due to config reload",
+ AutoVacuumShmem->av_freeParallelWorkers);
+
LWLockRelease(AutovacuumLock);
}
diff --git a/src/include/postmaster/autovacuum.h b/src/include/postmaster/autovacuum.h
index f3783afb51b..52be260e15f 100644
--- a/src/include/postmaster/autovacuum.h
+++ b/src/include/postmaster/autovacuum.h
@@ -66,6 +66,7 @@ extern bool AutoVacuumRequestWork(AutoVacuumWorkItemType type,
extern void AutoVacuumReserveParallelWorkers(int *nworkers);
extern void AutoVacuumReleaseParallelWorkers(int nworkers);
extern void AutoVacuumReleaseAllParallelWorkers(void);
+extern uint32 AutoVacuumGetFreeParallelWorkers(void);
/* shared memory stuff */
extern Size AutoVacuumShmemSize(void);
diff --git a/src/test/modules/Makefile b/src/test/modules/Makefile
index 44c7163c1cd..937dbb64fd2 100644
--- a/src/test/modules/Makefile
+++ b/src/test/modules/Makefile
@@ -16,6 +16,7 @@ SUBDIRS = \
plsample \
spgist_name_ops \
test_aio \
+ test_autovacuum \
test_binaryheap \
test_bitmapset \
test_bloomfilter \
diff --git a/src/test/modules/meson.build b/src/test/modules/meson.build
index 2634a519935..5ac8d87702d 100644
--- a/src/test/modules/meson.build
+++ b/src/test/modules/meson.build
@@ -16,6 +16,7 @@ subdir('plsample')
subdir('spgist_name_ops')
subdir('ssl_passphrase_callback')
subdir('test_aio')
+subdir('test_autovacuum')
subdir('test_binaryheap')
subdir('test_bitmapset')
subdir('test_bloomfilter')
diff --git a/src/test/modules/test_autovacuum/.gitignore b/src/test/modules/test_autovacuum/.gitignore
new file mode 100644
index 00000000000..716e17f5a2a
--- /dev/null
+++ b/src/test/modules/test_autovacuum/.gitignore
@@ -0,0 +1,2 @@
+# Generated subdirectories
+/tmp_check/
diff --git a/src/test/modules/test_autovacuum/Makefile b/src/test/modules/test_autovacuum/Makefile
new file mode 100644
index 00000000000..32254c53a5d
--- /dev/null
+++ b/src/test/modules/test_autovacuum/Makefile
@@ -0,0 +1,28 @@
+# src/test/modules/test_autovacuum/Makefile
+
+PGFILEDESC = "test_autovacuum - test code for parallel autovacuum"
+
+MODULE_big = test_autovacuum
+OBJS = \
+ $(WIN32RES) \
+ test_autovacuum.o
+
+EXTENSION = test_autovacuum
+DATA = test_autovacuum--1.0.sql
+
+TAP_TESTS = 1
+
+EXTRA_INSTALL = src/test/modules/injection_points
+
+export enable_injection_points
+
+ifdef USE_PGXS
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+else
+subdir = src/test/modules/test_autovacuum
+top_builddir = ../../../..
+include $(top_builddir)/src/Makefile.global
+include $(top_srcdir)/contrib/contrib-global.mk
+endif
diff --git a/src/test/modules/test_autovacuum/meson.build b/src/test/modules/test_autovacuum/meson.build
new file mode 100644
index 00000000000..75b24814b13
--- /dev/null
+++ b/src/test/modules/test_autovacuum/meson.build
@@ -0,0 +1,36 @@
+# Copyright (c) 2024-2025, PostgreSQL Global Development Group
+
+test_autovacuum_sources = files(
+ 'test_autovacuum.c',
+)
+
+if host_system == 'windows'
+ test_autovacuum_sources += rc_lib_gen.process(win32ver_rc, extra_args: [
+ '--NAME', 'test_autovacuum',
+ '--FILEDESC', 'test_autovacuum - test code for parallel autovacuum',])
+endif
+
+test_autovacuum = shared_module('test_autovacuum',
+ test_autovacuum_sources,
+ kwargs: pg_test_mod_args,
+)
+test_install_libs += test_autovacuum
+
+test_install_data += files(
+ 'test_autovacuum.control',
+ 'test_autovacuum--1.0.sql',
+)
+
+tests += {
+ 'name': 'test_autovacuum',
+ 'sd': meson.current_source_dir(),
+ 'bd': meson.current_build_dir(),
+ 'tap': {
+ 'env': {
+ 'enable_injection_points': get_option('injection_points') ? 'yes' : 'no',
+ },
+ 'tests': [
+ 't/001_parallel_autovacuum.pl',
+ ],
+ },
+}
diff --git a/src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl b/src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl
new file mode 100644
index 00000000000..edfbde73aac
--- /dev/null
+++ b/src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl
@@ -0,0 +1,299 @@
+# Test parallel autovacuum behavior
+
+use warnings FATAL => 'all';
+use PostgreSQL::Test::Cluster;
+use PostgreSQL::Test::Utils;
+use Test::More;
+
+if ($ENV{enable_injection_points} ne 'yes')
+{
+ plan skip_all => 'Injection points not supported by this build';
+}
+
+# Before each test we should disable autovacuum for 'test_autovac' table and
+# generate some dead tuples in it.
+
+sub prepare_for_next_test
+{
+ my ($node, $test_number) = @_;
+
+ $node->safe_psql('postgres', qq{
+ ALTER TABLE test_autovac SET (autovacuum_enabled = false);
+ });
+
+ $node->safe_psql('postgres', qq{
+ UPDATE test_autovac SET col_1 = $test_number;
+ });
+}
+
+
+my $psql_out;
+
+my $node = PostgreSQL::Test::Cluster->new('node1');
+$node->init;
+
+# Configure postgres, so it can launch parallel autovacuum workers, log all
+# information we are interested in and autovacuum works frequently
+$node->append_conf('postgresql.conf', qq{
+ max_worker_processes = 20
+ max_parallel_workers = 20
+ max_parallel_maintenance_workers = 20
+ autovacuum_max_parallel_workers = 20
+ log_min_messages = debug2
+ log_autovacuum_min_duration = 0
+ autovacuum_naptime = '1s'
+ min_parallel_index_scan_size = 0
+ shared_preload_libraries=test_autovacuum
+});
+$node->start;
+
+# Check if the extension injection_points is available, as it may be
+# possible that this script is run with installcheck, where the module
+# would not be installed by default.
+if (!$node->check_extension('injection_points'))
+{
+ plan skip_all => 'Extension injection_points not installed';
+}
+
+# Create all functions needed for testing
+$node->safe_psql('postgres', qq{
+ CREATE EXTENSION test_autovacuum;
+ CREATE EXTENSION injection_points;
+});
+
+my $indexes_num = 4;
+my $initial_rows_num = 10_000;
+my $autovacuum_parallel_workers = 2;
+
+# Create table and fill it with some data
+$node->safe_psql('postgres', qq{
+ CREATE TABLE test_autovac (
+ id SERIAL PRIMARY KEY,
+ col_1 INTEGER, col_2 INTEGER, col_3 INTEGER, col_4 INTEGER
+ ) WITH (autovacuum_parallel_workers = $autovacuum_parallel_workers);
+
+ INSERT INTO test_autovac
+ SELECT
+ g AS col1,
+ g + 1 AS col2,
+ g + 2 AS col3,
+ g + 3 AS col4
+ FROM generate_series(1, $initial_rows_num) AS g;
+});
+
+# Create specified number of b-tree indexes on the table
+$node->safe_psql('postgres', qq{
+ DO \$\$
+ DECLARE
+ i INTEGER;
+ BEGIN
+ FOR i IN 1..$indexes_num LOOP
+ EXECUTE format('CREATE INDEX idx_col_\%s ON test_autovac (col_\%s);', i, i);
+ END LOOP;
+ END \$\$;
+});
+
+# Test 1 :
+# Our table has enough indexes and appropriate reloptions, so autovacuum must
+# be able to process it in parallel mode. Just check if it can.
+# Also check whether all requested workers:
+# 1) launched
+# 2) correctly released
+
+prepare_for_next_test($node, 1);
+
+$node->safe_psql('postgres', qq{
+ ALTER TABLE test_autovac SET (autovacuum_enabled = true);
+});
+
+# Wait until the parallel autovacuum on table is completed. At the same time,
+# we check that the required number of parallel workers has been started.
+$log_start = $node->wait_for_log(
+ qr/parallel workers: index vacuum: 2 planned, 2 reserved, 2 launched/,
+ $log_start
+);
+
+$psql_out = $node->safe_psql('postgres', qq{
+ SELECT get_parallel_autovacuum_free_workers();
+});
+is($psql_out, 20, 'All parallel workers has been released by the leader');
+
+# Test 2:
+# Check whether parallel autovacuum leader can propagate cost-based parameters
+# to parallel workers.
+
+prepare_for_next_test($node, 2);
+
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_attach('autovacuum-start-parallel-vacuum', 'wait');
+ SELECT injection_points_attach('autovacuum-leader-before-indexes-processing', 'wait');
+
+ ALTER TABLE test_autovac SET (autovacuum_parallel_workers = 1, autovacuum_enabled = true);
+});
+
+# Wait until parallel autovacuum is inited
+$node->wait_for_event(
+ 'autovacuum worker',
+ 'autovacuum-start-parallel-vacuum'
+);
+
+# Reload config - leader worker must update its own parameters during indexes
+# processing
+$node->safe_psql('postgres', qq{
+ ALTER SYSTEM SET vacuum_cost_limit = 500;
+ ALTER SYSTEM SET vacuum_cost_page_miss = 10;
+ ALTER SYSTEM SET vacuum_cost_page_dirty = 10;
+ ALTER SYSTEM SET vacuum_cost_page_hit = 10;
+ SELECT pg_reload_conf();
+});
+
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_wakeup('autovacuum-start-parallel-vacuum');
+});
+
+# Now wait until parallel autovacuum leader completes processing table (i.e.
+# guaranteed to call vacuum_delay_point) and launches parallel worker.
+$node->wait_for_event(
+ 'autovacuum worker',
+ 'autovacuum-leader-before-indexes-processing'
+);
+
+# Check whether parallel worker successfully updated all parameters during
+# index processing
+$log_start = $node->wait_for_log(
+ qr/parallel autovacuum worker cost params: cost_limit=500, cost_delay=2, / .
+ qr/cost_page_miss=10, cost_page_dirty=10, cost_page_hit=10/,
+ $log_start
+);
+
+# Cleanup
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_wakeup('autovacuum-leader-before-indexes-processing');
+
+ SELECT injection_points_detach('autovacuum-start-parallel-vacuum');
+ SELECT injection_points_detach('autovacuum-leader-before-indexes-processing');
+
+ ALTER TABLE test_autovac SET (autovacuum_parallel_workers = $autovacuum_parallel_workers);
+});
+
+# Test 3:
+# Test adjustment of free parallel workers number when changing
+# autovacuum_max_parallel_workers parameter
+
+prepare_for_next_test($node, 4);
+
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_attach('autovacuum-leader-before-indexes-processing', 'wait');
+ ALTER TABLE test_autovac SET (autovacuum_enabled = true);
+});
+
+$node->wait_for_event(
+ 'autovacuum worker',
+ 'autovacuum-leader-before-indexes-processing'
+);
+
+$node->safe_psql('postgres', qq{
+ ALTER SYSTEM SET autovacuum_max_parallel_workers = 1;
+ SELECT pg_reload_conf();
+});
+
+# Since 2 parallel workers already launched and will be released in the future,
+# we are expecting that :
+# 1) number of free workers will be '0' after config reload
+# 2) number of free workers will be '1' after releasing workers
+
+# Check statement (1)
+$log_start = $node->wait_for_log(
+ qr/number of free parallel autovacuum workers is set to 0 due to config reload/,
+ $log_start
+);
+
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_wakeup('autovacuum-leader-before-indexes-processing');
+});
+
+# Wait until the end of parallel processing
+$log_start = $node->wait_for_log(
+ qr/parallel workers: index vacuum: 2 planned, 2 reserved, 2 launched/,
+ $log_start
+);
+
+# Check statement (2)
+$psql_out = $node->safe_psql('postgres', qq{
+ SELECT get_parallel_autovacuum_free_workers();
+});
+is($psql_out, 1, 'Number of free parallel workers is consistent');
+
+# Cleanup
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_detach('autovacuum-leader-before-indexes-processing');
+ ALTER SYSTEM SET autovacuum_max_parallel_workers = 10;
+ SELECT pg_reload_conf();
+});
+
+# Test 4:
+# We want parallel autovacuum workers to be released even if leader gets an
+# error. At first, simulate situation, when leader exits due to an ERROR.
+
+prepare_for_next_test($node, 4);
+
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_attach('autovacuum-leader-before-indexes-processing', 'error');
+ ALTER TABLE test_autovac SET (autovacuum_enabled = true);
+});
+
+$log_start = $node->wait_for_log(
+ qr/error triggered for injection point / .
+ qr/autovacuum-leader-before-indexes-processing/,
+ $log_start
+);
+
+$log_start = $node->wait_for_log(
+ qr/2 parallel autovacuum workers has been released after occured error/,
+ $log_start
+);
+
+# Cleanup
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_detach('autovacuum-leader-before-indexes-processing');
+});
+
+# Test 5:
+# Same as above test, but simulate situation, when leader exits due to FATAL.
+
+prepare_for_next_test($node, 5);
+
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_attach('autovacuum-leader-before-indexes-processing', 'wait');
+ ALTER TABLE test_autovac SET (autovacuum_enabled = true);
+});
+
+# Wait until parallel workers are reserved autovacuum and kill the leader
+$node->wait_for_event(
+ 'autovacuum worker',
+ 'autovacuum-leader-before-indexes-processing'
+);
+
+my $av_pid = $node->safe_psql('postgres', qq{
+ SELECT pid FROM pg_stat_activity
+ WHERE backend_type = 'autovacuum worker'
+ AND wait_event = 'autovacuum-leader-before-indexes-processing'
+ LIMIT 1;
+});
+
+$node->safe_psql('postgres', qq{
+ SELECT pg_terminate_backend('$av_pid');
+});
+
+$log_start = $node->wait_for_log(
+ qr/autovacuum worker before_shmem_exit: 2 parallel workers has been released/,
+ $log_start
+);
+
+# Cleanup
+$node->safe_psql('postgres', qq{
+ SELECT injection_points_detach('autovacuum-leader-before-indexes-processing');
+});
+
+$node->stop;
+done_testing();
diff --git a/src/test/modules/test_autovacuum/test_autovacuum--1.0.sql b/src/test/modules/test_autovacuum/test_autovacuum--1.0.sql
new file mode 100644
index 00000000000..e5646e0def5
--- /dev/null
+++ b/src/test/modules/test_autovacuum/test_autovacuum--1.0.sql
@@ -0,0 +1,12 @@
+/* src/test/modules/test_autovacuum/test_autovacuum--1.0.sql */
+
+-- complain if script is sourced in psql, rather than via CREATE EXTENSION
+\echo Use "CREATE EXTENSION test_autovacuum" to load this file. \quit
+
+/*
+ * Functions for expecting shared autovacuum state
+ */
+
+CREATE FUNCTION get_parallel_autovacuum_free_workers()
+RETURNS INTEGER STRICT
+AS 'MODULE_PATHNAME' LANGUAGE C;
diff --git a/src/test/modules/test_autovacuum/test_autovacuum.c b/src/test/modules/test_autovacuum/test_autovacuum.c
new file mode 100644
index 00000000000..195a6149a5d
--- /dev/null
+++ b/src/test/modules/test_autovacuum/test_autovacuum.c
@@ -0,0 +1,35 @@
+/*-------------------------------------------------------------------------
+ *
+ * test_autovacuum.c
+ * Helpers to write tests for parallel autovacuum
+ *
+ * Copyright (c) 2020-2026, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ * src/test/modules/test_autovacuum/test_autovacuum.c
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#include "postgres.h"
+
+#include "fmgr.h"
+#include "postmaster/autovacuum.h"
+#include "utils/injection_point.h"
+
+PG_MODULE_MAGIC;
+
+PG_FUNCTION_INFO_V1(get_parallel_autovacuum_free_workers);
+Datum
+get_parallel_autovacuum_free_workers(PG_FUNCTION_ARGS)
+{
+ uint32 nfree_workers;
+
+#ifndef USE_INJECTION_POINTS
+ ereport(ERROR, errmsg("injection points not supported"));
+#endif
+
+ nfree_workers = AutoVacuumGetFreeParallelWorkers();
+
+ PG_RETURN_UINT32(nfree_workers);
+}
diff --git a/src/test/modules/test_autovacuum/test_autovacuum.control b/src/test/modules/test_autovacuum/test_autovacuum.control
new file mode 100644
index 00000000000..1b7fad258f0
--- /dev/null
+++ b/src/test/modules/test_autovacuum/test_autovacuum.control
@@ -0,0 +1,3 @@
+comment = 'Test code for parallel autovacuum'
+default_version = '1.0'
+module_pathname = '$libdir/test_autovacuum'
--
2.43.0
From 5fa08ede2171b68b5b4652743d6401e3f6652f98 Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sun, 1 Mar 2026 21:36:00 +0700
Subject: [PATCH 3/3] fixes for 0004 patch
---
src/backend/commands/vacuumparallel.c | 33 ++++---------------
src/backend/postmaster/autovacuum.c | 18 +++++++---
src/test/modules/test_autovacuum/meson.build | 2 +-
.../t/001_parallel_autovacuum.pl | 26 ++-------------
.../modules/test_autovacuum/test_autovacuum.c | 8 +----
5 files changed, 26 insertions(+), 61 deletions(-)
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 54210a4971d..1d352b44e44 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -301,10 +301,6 @@ static bool parallel_vacuum_index_is_parallel_safe(Relation indrel, int num_inde
bool vacuum);
static void parallel_vacuum_error_callback(void *arg);
-#ifdef USE_INJECTION_POINTS
-static inline void parallel_vacuum_report_cost_based_params(void);
-#endif
-
/*
* Try to enter parallel mode and create a parallel context. Then initialize
* shared memory state.
@@ -1327,7 +1323,13 @@ parallel_vacuum_main(dsm_segment *seg, shm_toc *toc)
* allows tests to ensure this.
*/
if (shared->is_autovacuum)
- parallel_vacuum_report_cost_based_params();
+ elog(DEBUG2,
+ "parallel autovacuum worker cost params: cost_limit=%d, cost_delay=%g, cost_page_miss=%d, cost_page_dirty=%d, cost_page_hit=%d",
+ vacuum_cost_limit,
+ vacuum_cost_delay,
+ VacuumCostPageMiss,
+ VacuumCostPageDirty,
+ VacuumCostPageHit);
#endif
/* Report buffer/WAL usage during parallel execution */
@@ -1382,24 +1384,3 @@ parallel_vacuum_error_callback(void *arg)
return;
}
}
-
-#ifdef USE_INJECTION_POINTS
-/*
- * Log values related to cost-based vacuum delay parameters. It is used for
- * testing purpose.
- */
-static inline void
-parallel_vacuum_report_cost_based_params(void)
-{
- const char *msg_format =
- _("Parallel autovacuum worker cost params: cost_limit=%d, cost_delay=%g, cost_page_miss=%d, cost_page_dirty=%d, cost_page_hit=%d");
-
- elog(DEBUG2,
- msg_format,
- vacuum_cost_limit,
- vacuum_cost_delay,
- VacuumCostPageMiss,
- VacuumCostPageDirty,
- VacuumCostPageHit);
-}
-#endif
diff --git a/src/backend/postmaster/autovacuum.c b/src/backend/postmaster/autovacuum.c
index 7b24a5d6e67..d17fc92e783 100644
--- a/src/backend/postmaster/autovacuum.c
+++ b/src/backend/postmaster/autovacuum.c
@@ -1409,7 +1409,18 @@ avl_sigusr2_handler(SIGNAL_ARGS)
static void
autovacuum_worker_before_shmem_exit(int code, Datum arg)
{
+ int nreserved_old = av_nworkers_reserved;
+
AutoVacuumReleaseAllParallelWorkers();
+
+ if (nreserved_old > 0)
+ {
+ elog(DEBUG2,
+ ngettext("autovacuum worker before_shmem_exit: %d parallel worker has been released",
+ "autovacuum worker before_shmem_exit: %d parallel workers has been released",
+ nreserved_old - av_nworkers_reserved),
+ nreserved_old - av_nworkers_reserved);
+ }
}
/*
@@ -3656,10 +3667,9 @@ adjust_free_parallel_workers(int prev_max_parallel_workers)
AutoVacuumShmem->av_freeParallelWorkers = Max(nfree_workers, 0);
AutoVacuumShmem->av_maxParallelWorkers = autovacuum_max_parallel_workers;
- ereport(DEBUG2,
- (errmsg("number of free parallel autovacuum workers is set to %u due to config reload",
- AutoVacuumShmem->av_freeParallelWorkers),
- errhidecontext(true)));
+ elog(DEBUG2,
+ "number of free parallel autovacuum workers is set to %u due to config reload",
+ AutoVacuumShmem->av_freeParallelWorkers);
LWLockRelease(AutovacuumLock);
}
diff --git a/src/test/modules/test_autovacuum/meson.build b/src/test/modules/test_autovacuum/meson.build
index 3441e5e49cf..75b24814b13 100644
--- a/src/test/modules/test_autovacuum/meson.build
+++ b/src/test/modules/test_autovacuum/meson.build
@@ -30,7 +30,7 @@ tests += {
'enable_injection_points': get_option('injection_points') ? 'yes' : 'no',
},
'tests': [
- 't/001_basic.pl',
+ 't/001_parallel_autovacuum.pl',
],
},
}
diff --git a/src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl b/src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl
index 9b80d371f5c..edfbde73aac 100644
--- a/src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl
+++ b/src/test/modules/test_autovacuum/t/001_parallel_autovacuum.pl
@@ -161,7 +161,7 @@ $node->wait_for_event(
# Check whether parallel worker successfully updated all parameters during
# index processing
$log_start = $node->wait_for_log(
- qr/Parallel autovacuum worker cost params: cost_limit=500, cost_delay=2, / .
+ qr/parallel autovacuum worker cost params: cost_limit=500, cost_delay=2, / .
qr/cost_page_miss=10, cost_page_dirty=10, cost_page_hit=10/,
$log_start
);
@@ -264,20 +264,11 @@ $node->safe_psql('postgres', qq{
prepare_for_next_test($node, 5);
$node->safe_psql('postgres', qq{
- SELECT injection_points_attach('autovacuum-start-parallel-vacuum', 'wait');
SELECT injection_points_attach('autovacuum-leader-before-indexes-processing', 'wait');
ALTER TABLE test_autovac SET (autovacuum_enabled = true);
});
-# Wait until parallel autovacuum is inited and wake up the leader
-$node->wait_for_event(
- 'autovacuum worker',
- 'autovacuum-start-parallel-vacuum'
-);
-$node->safe_psql('postgres', qq{
- SELECT injection_points_wakeup('autovacuum-start-parallel-vacuum');
-});
-
+# Wait until parallel workers are reserved autovacuum and kill the leader
$node->wait_for_event(
'autovacuum worker',
'autovacuum-leader-before-indexes-processing'
@@ -295,23 +286,12 @@ $node->safe_psql('postgres', qq{
});
$log_start = $node->wait_for_log(
- qr/terminating autovacuum process due to administrator command/,
+ qr/autovacuum worker before_shmem_exit: 2 parallel workers has been released/,
$log_start
);
-# Now it is safe to check the number of free parallel workers, because even if
-# autovacuum is trying to vacuum table in parallel mode again, the leader
-# worker cannot go any further than "autovacuum-start-parallel-vacuum" point.
-# I.e. no one can interfere and change the number of free parallel workers.
-
-$psql_out = $node->safe_psql('postgres', qq{
- SELECT get_parallel_autovacuum_free_workers();
-});
-is($psql_out, 10, 'All parallel workers has been released by the leader after FATAL');
-
# Cleanup
$node->safe_psql('postgres', qq{
- SELECT injection_points_detach('autovacuum-start-parallel-vacuum');
SELECT injection_points_detach('autovacuum-leader-before-indexes-processing');
});
diff --git a/src/test/modules/test_autovacuum/test_autovacuum.c b/src/test/modules/test_autovacuum/test_autovacuum.c
index 959629c7685..195a6149a5d 100644
--- a/src/test/modules/test_autovacuum/test_autovacuum.c
+++ b/src/test/modules/test_autovacuum/test_autovacuum.c
@@ -3,7 +3,7 @@
* test_autovacuum.c
* Helpers to write tests for parallel autovacuum
*
- * Copyright (c) 2020-2025, PostgreSQL Global Development Group
+ * Copyright (c) 2020-2026, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/test/modules/test_autovacuum/test_autovacuum.c
@@ -13,14 +13,8 @@
#include "postgres.h"
-#include "commands/vacuum.h"
#include "fmgr.h"
-#include "miscadmin.h"
#include "postmaster/autovacuum.h"
-#include "storage/shmem.h"
-#include "storage/ipc.h"
-#include "storage/lwlock.h"
-#include "utils/builtins.h"
#include "utils/injection_point.h"
PG_MODULE_MAGIC;
--
2.43.0
From 57a2f96d489fe9c2b81b0310d7b9efcdd45460bc Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sat, 28 Feb 2026 18:36:08 +0700
Subject: [PATCH 1/3] fixes for 0003 patch
---
src/backend/commands/vacuumparallel.c | 23 +++++++++++++----------
1 file changed, 13 insertions(+), 10 deletions(-)
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 0ee4019f561..80b57bf9da3 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -74,13 +74,6 @@ typedef struct VacuumCostParams
(cost_params)->cost_page_hit = VacuumCostPageHit; \
(cost_params)->cost_page_miss = VacuumCostPageMiss
-#define VacCostParamsEquals(params) \
- (vacuum_cost_delay == (params).cost_delay && \
- vacuum_cost_limit == (params).cost_limit && \
- VacuumCostPageDirty == (params).cost_page_dirty && \
- VacuumCostPageHit == (params).cost_page_hit && \
- VacuumCostPageMiss == (params).cost_page_miss)
-
/*
* Struct for cost-based vacuum delay related parameters to share among an
* autovacuum worker and its parallel vacuum workers.
@@ -669,24 +662,34 @@ parallel_vacuum_update_shared_delay_params(void)
void
parallel_vacuum_propagate_shared_delay_params(void)
{
+ VacuumCostParams *params_data;
+
Assert(AmAutoVacuumWorkerProcess());
/* Check whether we are running parallel autovacuum */
if (pv_shared_cost_params == NULL)
return;
- SpinLockAcquire(&pv_shared_cost_params->mutex);
+ /*
+ * Only leader worker can modify this shared structure, so we can read it
+ * without acquiring a lock.
+ */
+ params_data = &pv_shared_cost_params->params_data;
- if (VacCostParamsEquals(pv_shared_cost_params->params_data))
+ if (vacuum_cost_delay == params_data->cost_delay &&
+ vacuum_cost_limit == params_data->cost_limit &&
+ VacuumCostPageDirty == params_data->cost_page_dirty &&
+ VacuumCostPageHit == params_data->cost_page_hit &&
+ VacuumCostPageMiss == params_data->cost_page_miss)
{
/*
* We don't need to update shared cost-based vacuum delay params if
* they haven't changed.
*/
- SpinLockRelease(&pv_shared_cost_params->mutex);
return;
}
+ SpinLockAcquire(&pv_shared_cost_params->mutex);
FillVacCostParams(&pv_shared_cost_params->params_data);
SpinLockRelease(&pv_shared_cost_params->mutex);
--
2.43.0
From 6242a38164eb1f81fb8735ea508100685a6ffa9a Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sat, 28 Feb 2026 17:33:45 +0700
Subject: [PATCH] fixes for 0001 patch
---
src/include/utils/rel.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/src/include/utils/rel.h b/src/include/utils/rel.h
index 7c5e35a486c..11dd3aebc6c 100644
--- a/src/include/utils/rel.h
+++ b/src/include/utils/rel.h
@@ -313,8 +313,9 @@ typedef struct AutoVacOpts
bool enabled;
/*
- * Max number of parallel autovacuum workers. If value is 0 then parallel
- * degree will computed based on number of indexes.
+ * Target number of parallel autovacuum workers. -1 by default disables
+ * parallel vacuum during autovacuum. 0 means choose the parallel degree
+ * based on the number of indexes.
*/
int autovacuum_parallel_workers;
--
2.43.0
From bc4479dab3a81fc26e15b55f1c053c46c6cc5279 Mon Sep 17 00:00:00 2001
From: Daniil Davidov <[email protected]>
Date: Sat, 28 Feb 2026 18:11:58 +0700
Subject: [PATCH] fixes for 0002 patch
---
src/backend/access/heap/vacuumlazy.c | 9 +--------
src/backend/commands/vacuumparallel.c | 3 +++
src/include/commands/vacuum.h | 21 ++++++++++++++++-----
src/tools/pgindent/typedefs.list | 1 -
4 files changed, 20 insertions(+), 14 deletions(-)
diff --git a/src/backend/access/heap/vacuumlazy.c b/src/backend/access/heap/vacuumlazy.c
index 055ddf566dc..1e2d5be1af2 100644
--- a/src/backend/access/heap/vacuumlazy.c
+++ b/src/backend/access/heap/vacuumlazy.c
@@ -348,6 +348,7 @@ typedef struct LVRelState
* index scans.
*/
PVWorkersUsage workers_usage;
+
/* Counters that follow are only for scanned_pages */
int64 tuples_deleted; /* # deleted from table */
int64 tuples_frozen; /* # newly frozen */
@@ -1135,11 +1136,8 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
vacrel->lpdead_items);
if (vacrel->workers_usage.vacuum.nplanned > 0)
{
- /* Stats for vacuum phase of index vacuuming. */
-
if (AmAutoVacuumWorkerProcess())
{
- /* Worker usage stats for parallel autovacuum. */
appendStringInfo(&buf,
_("parallel workers: index vacuum: %d planned, %d reserved, %d launched in total\n"),
vacrel->workers_usage.vacuum.nplanned,
@@ -1148,7 +1146,6 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
}
else
{
- /* Worker usage stats for manual VACUUM (PARALLEL). */
appendStringInfo(&buf,
_("parallel workers: index vacuum: %d planned, %d launched in total\n"),
vacrel->workers_usage.vacuum.nplanned,
@@ -1157,11 +1154,8 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
}
if (vacrel->workers_usage.cleanup.nplanned > 0)
{
- /* Stats for cleanup phase of index vacuuming. */
-
if (AmAutoVacuumWorkerProcess())
{
- /* Worker usage stats for parallel autovacuum. */
appendStringInfo(&buf,
_("parallel workers: index cleanup: %d planned, %d reserved, %d launched\n"),
vacrel->workers_usage.cleanup.nplanned,
@@ -1170,7 +1164,6 @@ heap_vacuum_rel(Relation rel, const VacuumParams params,
}
else
{
- /* Worker usage stats for manual VACUUM (PARALLEL). */
appendStringInfo(&buf,
_("parallel workers: index cleanup: %d planned, %d launched\n"),
vacrel->workers_usage.cleanup.nplanned,
diff --git a/src/backend/commands/vacuumparallel.c b/src/backend/commands/vacuumparallel.c
index 177264cb2e6..643849b2fb8 100644
--- a/src/backend/commands/vacuumparallel.c
+++ b/src/backend/commands/vacuumparallel.c
@@ -619,6 +619,9 @@ parallel_vacuum_compute_workers(Relation *indrels, int nindexes, int nrequested,
/*
* Perform index vacuum or index cleanup with parallel workers. This function
* must be used by the parallel vacuum leader process.
+ *
+ * If wstats is not NULL, the statistics it stores will be updated according
+ * to what happens during function execution.
*/
static void
parallel_vacuum_process_all_indexes(ParallelVacuumState *pvs, int num_index_scans,
diff --git a/src/include/commands/vacuum.h b/src/include/commands/vacuum.h
index d3dc4e8cc67..1b1fb625cb2 100644
--- a/src/include/commands/vacuum.h
+++ b/src/include/commands/vacuum.h
@@ -305,11 +305,22 @@ typedef struct VacDeadItemsInfo
*/
typedef struct PVWorkersStats
{
- int nplanned; /* # of parallel workers we are planned to
- * launch */
- int nreserved; /* for autovacuum only - # of parallel workers
- * we have managed to reserve */
- int nlaunched; /* # of launched parallel workers */
+ /* Number of parallel workers we are planned to launch */
+ int nplanned;
+
+ /*
+ * Number of parallel workers we have managed to reserve.
+ *
+ * Note, that we collect this stats only for the parallel *autovacuum*
+ * since during it we must reserve workers in shared state before actually
+ * trying to launch them (in order to meet the
+ * autovacuum_max_parallel_workers limit). Manual VACUUM (PARALLEL), on
+ * the contrary, doesn't need to reserve workers.
+ */
+ int nreserved;
+
+ /* Number of launched parallel workers */
+ int nlaunched;
} PVWorkersStats;
/*
diff --git a/src/tools/pgindent/typedefs.list b/src/tools/pgindent/typedefs.list
index 6ceb6cac14f..536237ff546 100644
--- a/src/tools/pgindent/typedefs.list
+++ b/src/tools/pgindent/typedefs.list
@@ -2410,7 +2410,6 @@ PullFilterOps
PushFilter
PushFilterOps
PushFunction
-PVWorkersUsage
PyCFunction
PyMethodDef
PyModuleDef
--
2.43.0
