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Move "hot" members of PGPROC into a separate PGXACT array.

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This speeds up snapshot-taking and reduces ProcArrayLock contention.
Also, the PGPROC (and PGXACT) structures used by two-phase commit are
now allocated as part of the main array, rather than in a separate
array, and we keep ProcArray sorted in pointer order.  These changes
are intended to minimize the number of cache lines that must be pulled
in to take a snapshot, and testing shows a substantial increase in
performance on both read and write workloads at high concurrencies.

Pavan Deolasee, Heikki Linnakangas, Robert Haas
This commit is contained in:
Robert Haas
2011-11-25 08:02:10 -05:00
parent 9ed439a9c0
commit ed0b409d22
14 changed files with 356 additions and 208 deletions
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4
src/backend/access/transam/xact.c
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@ -981,7 +981,7 @@ RecordTransactionCommit(void)
* bit fuzzy, but it doesn't matter.
*/
START_CRIT_SECTION();
MyProc->inCommit = true;
MyPgXact->inCommit = true;
SetCurrentTransactionStopTimestamp();
@ -1155,7 +1155,7 @@ RecordTransactionCommit(void)
*/
if (markXidCommitted)
{
MyProc->inCommit = false;
MyPgXact->inCommit = false;
END_CRIT_SECTION();
}