Changeset: d7127a6844a1 for MonetDB
URL: http://dev.monetdb.org/hg/MonetDB?cmd=changeset;node=d7127a6844a1
Modified Files:
monetdb5/mal/mal.c
Branch: Feb2013
Log Message:
make mal_parallelism grow linearly with GDKnr_threads
Before we forget it, I implement what I suggested in the log message
of changeset 552e730a8fd0.
diffs (16 lines):
diff --git a/monetdb5/mal/mal.c b/monetdb5/mal/mal.c
--- a/monetdb5/mal/mal.c
+++ b/monetdb5/mal/mal.c
@@ -234,7 +234,11 @@ int mal_init(void){
MT_lock_init( &mal_profileLock, "mal_profileLock");
MT_lock_init( &mal_copyLock, "mal_copyLock");
MT_lock_init( &mal_delayLock, "mal_delayLock");
- MT_sema_init( &mal_parallelism, (GDKnr_threads > 1 ? GDKnr_threads/2:
4), "mal_parallelism");
+ /* "/2" is arbitrarily used / chosen, as on systems with
+ * hyper-threading enabled, using all hardware threads rather than
+ * "only" all physical cores does not necessarily yield a linear
+ * performance benefit */
+ MT_sema_init( &mal_parallelism, (GDKnr_threads > 1 ? GDKnr_threads/2:
1), "mal_parallelism");
tstAligned();
MCinit();
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