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Further reduce the number of semaphores used under --disable-spinlocks.

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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.
This commit is contained in:
Tom Lane 2016-04-18 13:33:06 -04:00
parent 8ce8307bd4
commit 75c24d0f74
1 changed files with 1 additions and 1 deletions
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src/include/pg_config_manual.h
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@ -57,7 +57,7 @@
* may improve performance, but supplying a real spinlock implementation is * may improve performance, but supplying a real spinlock implementation is
* probably far better. * probably far better.
*/ */
#define NUM_SPINLOCK_SEMAPHORES 1024 #define NUM_SPINLOCK_SEMAPHORES 128
/* /*
* When we have neither spinlocks nor atomic operations support we're * When we have neither spinlocks nor atomic operations support we're