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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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6
src/backend/storage/ipc/procarray.c
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@@ -14,8 +14,8 @@
*
* The process array now also includes PGPROC structures representing
* prepared transactions. The xid and subxids fields of these are valid,
* as is the procLocks list. They can be distinguished from regular backend
* PGPROCs at need by checking for pid == 0.
* as are the myProcLocks lists. They can be distinguished from regular
* backend PGPROCs at need by checking for pid == 0.
*
*
* Portions Copyright (c) 1996-2005, PostgreSQL Global Development Group
@@ -23,7 +23,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.8 2005/11/22 18:17:20 momjian Exp $
* $PostgreSQL: pgsql/src/backend/storage/ipc/procarray.c,v 1.9 2005/12/11 21:02:18 tgl Exp $
*
*-------------------------------------------------------------------------
*/