Changeset: 3a6f13db184e for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=3a6f13db184e
Modified Files:
monetdb5/mal/mal.c
monetdb5/mal/mal.h
monetdb5/mal/mal_dataflow.c
Branch: default
Log Message:
Give delayed threads their own lock
and refine the punishment to include all instructions
when we reached our memory quota.
diffs (83 lines):
diff --git a/monetdb5/mal/mal.c b/monetdb5/mal/mal.c
--- a/monetdb5/mal/mal.c
+++ b/monetdb5/mal/mal.c
@@ -197,6 +197,7 @@ MT_Lock mal_contextLock;
MT_Lock mal_remoteLock;
MT_Lock mal_profileLock ;
MT_Lock mal_copyLock;
+MT_Lock mal_delayLock;
/*
* @-
* Initialization of the MAL context
@@ -234,6 +235,7 @@ int mal_init(void){
MT_lock_init( &mal_remoteLock, "mal_remoteLock");
MT_lock_init( &mal_profileLock, "mal_profileLock");
MT_lock_init( &mal_copyLock, "mal_copyLock");
+ MT_lock_init( &mal_delayLock, "mal_delayLock");
GDKprotect();
tstAligned();
diff --git a/monetdb5/mal/mal.h b/monetdb5/mal/mal.h
--- a/monetdb5/mal/mal.h
+++ b/monetdb5/mal/mal.h
@@ -126,6 +126,7 @@ mal_export MT_Lock mal_contextLock;
mal_export MT_Lock mal_remoteLock;
mal_export MT_Lock mal_profileLock ;
mal_export MT_Lock mal_copyLock ;
+mal_export MT_Lock mal_delayLock ;
mal_export int mal_init(void);
diff --git a/monetdb5/mal/mal_dataflow.c b/monetdb5/mal/mal_dataflow.c
--- a/monetdb5/mal/mal_dataflow.c
+++ b/monetdb5/mal/mal_dataflow.c
@@ -873,21 +873,22 @@ runDFLOWworker(void *t)
else
q_enqueue(task->flow->done, fs);
/* Thread chain context switch decision. */
- /* Delay the threads if too much competition arises */
+ /* Delay the threads if too much competition arises and memory
becomes scarce */
/* If in the mean time memory becomes free, or too many sleep,
re-enable worker */
/* It may happen that all threads enter the wait state. So,
keep one running at all time */
- if ( nxtfs == 0){
+ if ( nxtfs == 0 || MT_getrss() > MEMORY_THRESHOLD *
monet_memory) {
long delay, clk = (GDKusec()- usec)/1000;
+ int rss=0;
double factor = 1.0;
if ( clk > DELAYUNIT ) {
- mal_set_lock(mal_contextLock, "runMALdataflow");
+ mal_set_lock(mal_delayLock, "runMALdataflow");
asleep++;
/* speedup as we see more threads asleep */
clk = (long) (clk * (1.0-
asleep/GDKnr_threads));
/* always keep one running to avoid all waiting
for a chain context switch */
if ( asleep >= GDKnr_threads)
clk = -2 * DELAYUNIT;
- mal_unset_lock(mal_contextLock,
"runMALdataflow");
+ mal_unset_lock(mal_delayLock, "runMALdataflow");
/* if there are no other instructions in the
queue, then simply wait for them */
if ( task->todo->last == 0)
clk = -3 * DELAYUNIT;
@@ -895,16 +896,18 @@ runDFLOWworker(void *t)
PARDEBUG mnstr_printf(GDKstdout,"#delay %d
initial %ld\n", task->id, clk);
while (clk > 0 ){
/* speed up wake up when we have memory
or too many sleepers */
- factor = MT_getrss()/(MEMORY_THRESHOLD
* monet_memory);
+ /* don't call getrss too often */
+ if ( rss++ % 10 == 0)
+ factor =
MT_getrss()/(MEMORY_THRESHOLD * monet_memory);
delay = (long)( DELAYUNIT * (factor >
1.0 ? 1.0:factor));
- //delay = (long) (delay * (1.0 -
asleep/GDKnr_threads));
+ delay = (long) (delay * (1.0 -
(asleep-1)/GDKnr_threads));
if ( delay)
MT_sleep_ms( delay );
clk -= DELAYUNIT;
}
- mal_set_lock(mal_contextLock, "runMALdataflow");
+ mal_set_lock(mal_delayLock, "runMALdataflow");
asleep--;
- mal_unset_lock(mal_contextLock,
"runMALdataflow");
+ mal_unset_lock(mal_delayLock, "runMALdataflow");
PARDEBUG mnstr_printf(GDKstdout,"#delayed
finished thread %d asleep %d\n", task->id, asleep);
}
}
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