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| author | Tom Lane <tgl@sss.pgh.pa.us> | 2016-04-18 13:33:07 -0400 |
|---|---|---|
| committer | Tom Lane <tgl@sss.pgh.pa.us> | 2016-04-18 13:33:07 -0400 |
| commit | c6a5b6677d5f12ccf3c2373117bf630ead30b798 (patch) | |
| tree | 9be708515ae244671dac5454bb7394a384354b16 | |
| parent | e2c183ef808466ed20c2d7877b9c10e13c897e16 (diff) | |
| download | postgresql-c6a5b6677d5f12ccf3c2373117bf630ead30b798.tar.gz postgresql-c6a5b6677d5f12ccf3c2373117bf630ead30b798.zip | |
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.
| -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 e278fa07d3d..91fb134e96f 100644 --- a/src/include/pg_config_manual.h +++ b/src/include/pg_config_manual.h @@ -62,7 +62,7 @@ * 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 |