Commit: 86869ee30c42322090da9e3b93cf8dd663ac042f
Author: Bastien Montagne
Date: Mon May 16 17:15:18 2016 +0200
Branches: compositor-2016
https://developer.blender.org/rB86869ee30c42322090da9e3b93cf8dd663ac042f
BLI_task: Add new 'BLI_task_parallel_range_finalize()'.
Together with the extended loop callback and userdata_chunk, this allows to
perform
cumulative tasks (like aggregation) in a lockfree way using local
userdata_chunk to store temp data,
and once all workers have finished, to merge those userdata_chunks in the
finalize callback
(from calling thread, so no need to lock here either).
Note that this changes how userdata_chunk is handled (now fully from 'main'
thread,
which means a given worker thread will always get the same userdata_chunk,
without
being re-initialized anymore to init value at start of each iter chunk).
===================================================================
M source/blender/blenlib/BLI_task.h
M source/blender/blenlib/intern/task.c
===================================================================
diff --git a/source/blender/blenlib/BLI_task.h
b/source/blender/blenlib/BLI_task.h
index c511ec4..967e0be 100644
--- a/source/blender/blenlib/BLI_task.h
+++ b/source/blender/blenlib/BLI_task.h
@@ -119,11 +119,13 @@ size_t BLI_task_pool_tasks_done(TaskPool *pool);
/* Parallel for routines */
typedef void (*TaskParallelRangeFunc)(void *userdata, const int iter);
typedef void (*TaskParallelRangeFuncEx)(void *userdata, void *userdata_chunk,
const int iter, const int thread_id);
+typedef void (*TaskParallelRangeFuncFinalize)(void *userdata, void
*userdata_chunk);
void BLI_task_parallel_range_ex(
int start, int stop,
void *userdata,
void *userdata_chunk,
- const size_t userdata_chunk_size, TaskParallelRangeFuncEx func_ex,
+ const size_t userdata_chunk_size,
+ TaskParallelRangeFuncEx func_ex,
const bool use_threading,
const bool use_dynamic_scheduling);
void BLI_task_parallel_range(
@@ -132,6 +134,16 @@ void BLI_task_parallel_range(
TaskParallelRangeFunc func,
const bool use_threading);
+void BLI_task_parallel_range_finalize(
+ int start, int stop,
+ void *userdata,
+ void *userdata_chunk,
+ const size_t userdata_chunk_size,
+ TaskParallelRangeFuncEx func_ex,
+ TaskParallelRangeFuncFinalize func_finalize,
+ const bool use_threading,
+ const bool use_dynamic_scheduling);
+
typedef void (*TaskParallelListbaseFunc)(void *userdata,
struct Link *iter,
int index);
diff --git a/source/blender/blenlib/intern/task.c
b/source/blender/blenlib/intern/task.c
index a34d9e9..4ef42dc 100644
--- a/source/blender/blenlib/intern/task.c
+++ b/source/blender/blenlib/intern/task.c
@@ -768,8 +768,6 @@ size_t BLI_task_pool_tasks_done(TaskPool *pool)
typedef struct ParallelRangeState {
int start, stop;
void *userdata;
- void *userdata_chunk;
- size_t userdata_chunk_size;
TaskParallelRangeFunc func;
TaskParallelRangeFuncEx func_ex;
@@ -792,24 +790,16 @@ BLI_INLINE bool parallel_range_next_iter_get(
static void parallel_range_func(
TaskPool * __restrict pool,
- void *UNUSED(taskdata),
+ void *userdata_chunk,
int threadid)
{
ParallelRangeState * __restrict state = BLI_task_pool_userdata(pool);
int iter, count;
- const bool use_userdata_chunk = (state->func_ex != NULL) &&
- (state->userdata_chunk_size != 0) &&
(state->userdata_chunk != NULL);
- void *userdata_chunk = use_userdata_chunk ?
MALLOCA(state->userdata_chunk_size) : NULL;
-
while (parallel_range_next_iter_get(state, &iter, &count)) {
int i;
if (state->func_ex) {
- if (use_userdata_chunk) {
- memcpy(userdata_chunk, state->userdata_chunk,
state->userdata_chunk_size);
- }
-
for (i = 0; i < count; ++i) {
state->func_ex(state->userdata, userdata_chunk,
iter + i, threadid);
}
@@ -820,8 +810,6 @@ static void parallel_range_func(
}
}
}
-
- MALLOCA_FREE(userdata_chunk, state->userdata_chunk_size);
}
/**
@@ -836,6 +824,7 @@ static void task_parallel_range_ex(
const size_t userdata_chunk_size,
TaskParallelRangeFunc func,
TaskParallelRangeFuncEx func_ex,
+ TaskParallelRangeFuncFinalize func_finalize,
const bool use_threading,
const bool use_dynamic_scheduling)
{
@@ -844,6 +833,10 @@ static void task_parallel_range_ex(
ParallelRangeState state;
int i, num_threads, num_tasks;
+ void *userdata_chunk_local = NULL;
+ void *userdata_chunk_array = NULL;
+ const bool use_userdata_chunk = (func_ex != NULL) &&
(userdata_chunk_size != 0) && (userdata_chunk != NULL);
+
if (start == stop) {
return;
}
@@ -859,9 +852,6 @@ static void task_parallel_range_ex(
*/
if (!use_threading) {
if (func_ex) {
- const bool use_userdata_chunk = (userdata_chunk_size !=
0) && (userdata_chunk != NULL);
- void *userdata_chunk_local = NULL;
-
if (use_userdata_chunk) {
userdata_chunk_local =
MALLOCA(userdata_chunk_size);
memcpy(userdata_chunk_local, userdata_chunk,
userdata_chunk_size);
@@ -871,6 +861,10 @@ static void task_parallel_range_ex(
func_ex(userdata, userdata_chunk, i, 0);
}
+ if (func_finalize) {
+ func_finalize(userdata, userdata_chunk);
+ }
+
MALLOCA_FREE(userdata_chunk_local, userdata_chunk_size);
}
else {
@@ -895,8 +889,6 @@ static void task_parallel_range_ex(
state.start = start;
state.stop = stop;
state.userdata = userdata;
- state.userdata_chunk = userdata_chunk;
- state.userdata_chunk_size = userdata_chunk_size;
state.func = func;
state.func_ex = func_ex;
state.iter = start;
@@ -910,15 +902,34 @@ static void task_parallel_range_ex(
num_tasks = min_ii(num_tasks, (stop - start) / state.chunk_size);
atomic_fetch_and_add_uint32((uint32_t *)(&state.iter), 0);
+ if (use_userdata_chunk) {
+ userdata_chunk_array = MALLOCA(userdata_chunk_size * num_tasks);
+ }
+
for (i = 0; i < num_tasks; i++) {
+ if (use_userdata_chunk) {
+ userdata_chunk_local = (char *)userdata_chunk_array +
(userdata_chunk_size * i);
+ memcpy(userdata_chunk_local, userdata_chunk,
userdata_chunk_size);
+ }
+ /* Use this pool's pre-allocated tasks. */
BLI_task_pool_push_from_thread(task_pool,
parallel_range_func,
- NULL, false,
+ userdata_chunk_local, false,
TASK_PRIORITY_HIGH, 0);
}
BLI_task_pool_work_and_wait(task_pool);
BLI_task_pool_free(task_pool);
+
+ if (use_userdata_chunk) {
+ if (func_finalize) {
+ for (i = 0; i < num_tasks; i++) {
+ userdata_chunk_local = (char
*)userdata_chunk_array + (userdata_chunk_size * i);
+ func_finalize(userdata, userdata_chunk_local);
+ }
+ }
+ MALLOCA_FREE(userdata_chunk_array, userdata_chunk_size * num_tasks);
+ }
}
/**
@@ -946,7 +957,7 @@ void BLI_task_parallel_range_ex(
const bool use_dynamic_scheduling)
{
task_parallel_range_ex(
- start, stop, userdata, userdata_chunk, userdata_chunk_size,
NULL, func_ex,
+ start, stop, userdata, userdata_chunk, userdata_chunk_size,
NULL, func_ex, NULL,
use_threading, use_dynamic_scheduling);
}
@@ -967,7 +978,39 @@ void BLI_task_parallel_range(
TaskParallelRangeFunc func,
const bool use_threading)
{
- task_parallel_range_ex(start, stop, userdata, NULL, 0, func, NULL,
use_threading, false);
+ task_parallel_range_ex(start, stop, userdata, NULL, 0, func, NULL,
NULL, use_threading, false);
+}
+
+/**
+ * This function allows to parallelize for loops in a similar way to OpenMP's
'parallel for' statement,
+ * with an additional 'finalize' func called from calling thread once whole
range have been processed.
+ *
+ * \param start First index to process.
+ * \param stop Index to stop looping (excluded).
+ * \param userdata Common userdata passed to all instances of \a func.
+ * \param userdata_chunk Optional, each instance of looping chunks will get a
copy of this data
+ * (similar to OpenMP's firstprivate).
+ * \param userdata_chunk_size Memory size of \a userdata_chunk.
+ * \param func_ex Callback function (advanced version).
+ * \param func_finalize Callback function, called after all workers have
finisehd, useful to finalize accumulative tasks.
+ * \param use_threading If \a true, actually split-execute loop in threads,
else just do a sequential forloop
+ * (allows caller to use any kind of test to switch on
parallelization or not).
+ * \param use_dynamic_scheduling If \a true, the whole range is divided in a
lot of small chunks (of size 32 currently),
+ * otherwise whole range is split in a few big
chunks (num_threads * 2 chunks currently).
+ */
+void BLI_task_parallel_range_finalize(
+ int start, int stop,
+ void *userdata,
+ void *userdata_chunk,
+ const size_t userdata_chunk_size,
+ TaskParallelRangeFuncEx func_ex,
+ TaskParallelRangeFuncFinalize func_finalize,
+ const bool use_threading,
+ const bool use_dynamic_scheduling)
+{
+ task_parallel_range_ex(
+ start, stop, userdata, userdata_chunk, userdata_chunk_size,
NULL, func_ex, func_finalize,
+ use_threading, use_dynamic_scheduling);
}
#undef MALLOCA
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