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Commit 75c24d0

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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.
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‎src/include/pg_config_manual.h

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* may improve performance, but supplying a real spinlock implementation is
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* probably far better.
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*/
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#define NUM_SPINLOCK_SEMAPHORES 1024
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#define NUM_SPINLOCK_SEMAPHORES 128
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/*
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* When we have neither spinlocks nor atomic operations support we're

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