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Divide the lock manager's shared state into 'partitions', so as to

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reduce contention for the former single LockMgrLock.  Per my recent
proposal.  I set it up for 16 partitions, but on a pgbench test this
gives only a marginal further improvement over 4 partitions --- we need
to test more scenarios to choose the number of partitions.
This commit is contained in:
Tom Lane
2005-12-11 21:02:18 +00:00
parent be8100d64e
commit ec0baf949e
10 changed files with 643 additions and 415 deletions
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5
src/backend/access/transam/twophase.c
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@@ -7,7 +7,7 @@
* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.17 2005/11/22 18:17:07 momjian Exp $
* $PostgreSQL: pgsql/src/backend/access/transam/twophase.c,v 1.18 2005/12/11 21:02:17 tgl Exp $
*
* NOTES
* Each global transaction is associated with a global transaction
@@ -284,7 +284,8 @@ MarkAsPreparing(TransactionId xid, const char *gid,
gxact->proc.lwWaitLink = NULL;
gxact->proc.waitLock = NULL;
gxact->proc.waitProcLock = NULL;
SHMQueueInit(&(gxact->proc.procLocks));
for (i = 0; i < NUM_LOCK_PARTITIONS; i++)
SHMQueueInit(&(gxact->proc.myProcLocks[i]));
/* subxid data must be filled later by GXactLoadSubxactData */
gxact->proc.subxids.overflowed = false;
gxact->proc.subxids.nxids = 0;