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Commitb8ed4cc

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Calculate # of semaphores correctly with --disable-spinlocks.
The old formula didn't take into account that each WAL sender process needsa spinlock. We had also already exceeded the fixed number of spinlocksreserved for misc purposes (10). Bump that to 30.Backpatch to 9.0, where WAL senders were introduced. If I counted correctly,9.0 had exactly 10 predefined spinlocks, and 9.1 exceeded that, but bump thelimit in 9.0 too because 10 is uncomfortably close to the edge.
1 parentf7b0006 commitb8ed4cc

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  • src/backend/storage/lmgr

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‎src/backend/storage/lmgr/spin.c

Lines changed: 11 additions & 3 deletions
Original file line numberDiff line numberDiff line change
@@ -23,6 +23,7 @@
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#include"postgres.h"
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#include"miscadmin.h"
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#include"replication/walsender.h"
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#include"storage/lwlock.h"
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#include"storage/spin.h"
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@@ -50,14 +51,21 @@ SpinlockSemas(void)
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int
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SpinlockSemas(void)
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{
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intnsemas;
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/*
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* It would be cleaner to distribute this logic into the affected modules,
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* similar to the way shmem space estimation is handled.
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*
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* For now, though,we just need a fewspinlocks(10 should be plenty)
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*plus one for each LWLock and one for each buffer header.
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* For now, though,there are few enough users ofspinlocksthat we just
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*keep the knowledge here.
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*/
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returnNumLWLocks()+NBuffers+10;
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nsemas=NumLWLocks();/* one for each lwlock */
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nsemas+=NBuffers;/* one for each buffer header */
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nsemas+=max_wal_senders;/* one for each wal sender process */
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nsemas+=30;/* plus a bunch for other small-scale use */
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returnnsemas;
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}
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/*

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