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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2016-04-18 13:33:06 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2016-04-18 13:33:06 -0400 |
| commit | 75c24d0f7491f77dfbc0acdf6c18439f288353ef (patch) | |
| tree | 3db8025de40a5597fe8f909d691cf6daf6d66f03 /src/include/pg_config_manual.h | |
| parent | 8ce8307bd4d6028371c6e8b51bdc6ad260baa03a (diff) | |
| download | postgresql-75c24d0f7491f77dfbc0acdf6c18439f288353ef.tar.gz | |
Further reduce the number of semaphores used under --disable-spinlocks.
Per discussion, there doesn't seem to be much value in having
NUM_SPINLOCK_SEMAPHORES set to 1024: under any scenario where you are
running more than a few backends concurrently, you really had better have a
real spinlock implementation if you want tolerable performance. And 1024
semaphores is a sizable fraction of the system-wide SysV semaphore limit
on many platforms. Therefore, reduce this setting's default value to 128
to make it less likely to cause out-of-semaphores problems.
Diffstat (limited to 'src/include/pg_config_manual.h')
| -rw-r--r-- | src/include/pg_config_manual.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/src/include/pg_config_manual.h b/src/include/pg_config_manual.h index ef895211da..8d5a378387 100644 --- a/src/include/pg_config_manual.h +++ b/src/include/pg_config_manual.h @@ -57,7 +57,7 @@ * may improve performance, but supplying a real spinlock implementation is * probably far better. */ -#define NUM_SPINLOCK_SEMAPHORES 1024 +#define NUM_SPINLOCK_SEMAPHORES 128 /* * When we have neither spinlocks nor atomic operations support we're |