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Make walsender more responsive.

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Per testing by Andres Freund, this improves replication performance
and reduces replication latency and latency jitter.  I was a bit
concerned about moving more work into XLogInsert, but testing seems
to show that it's not a problem in practice.

Along the way, improve comments for WaitLatchOrSocket.

Andres Freund.  Review and stylistic cleanup by me.
This commit is contained in:
Robert Haas
2012-07-02 09:36:34 -04:00
parent 9ad45c18b6
commit f83b59997d
7 changed files with 59 additions and 36 deletions
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7
src/backend/access/transam/xact.c
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@ -1141,13 +1141,6 @@ RecordTransactionCommit(void)
XLogFlush(XactLastRecEnd);
/*
* Wake up all walsenders to send WAL up to the COMMIT record
* immediately if replication is enabled
*/
if (max_wal_senders > 0)
WalSndWakeup();
/*
* Now we may update the CLOG, if we wrote a COMMIT record above
*/