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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 havingNUM_SPINLOCK_SEMAPHORES set to 1024: under any scenario where you arerunning more than a few backends concurrently, you really had better have areal spinlock implementation if you want tolerable performance. And 1024semaphores is a sizable fraction of the system-wide SysV semaphore limiton many platforms. Therefore, reduce this setting's default value to 128to make it less likely to cause out-of-semaphores problems.1 parente2c183e commitc6a5b66
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