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Reduce CPU utilisation of WALSender process. Process was using 10% CPU

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doing nothing, caused by naptime specified in milliseconds yet units of
pg_usleep() parameter is microseconds. Correctly specifying units
reduces call frequency by 1000. Reduction in CPU consumption verified.
This commit is contained in:
Simon Riggs 2010-03-24 20:11:12 +00:00
parent 16a4186d6a
commit 08882ce74c
1 changed files with 3 additions and 3 deletions
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6
src/backend/replication/walsender.c
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@ -30,7 +30,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.10 2010/03/16 09:09:55 heikki Exp $
* $PostgreSQL: pgsql/src/backend/replication/walsender.c,v 1.11 2010/03/24 20:11:12 sriggs Exp $
*
*-------------------------------------------------------------------------
*/
@ -67,7 +67,7 @@ bool am_walsender = false; /* Am I a walsender process ? */
int MaxWalSenders = 0; /* the maximum number of concurrent walsenders */
int WalSndDelay = 200; /* max sleep time between some actions */
#define NAPTIME_PER_CYCLE 100 /* max sleep time between cycles (100ms) */
#define NAPTIME_PER_CYCLE 100000L /* max sleep time between cycles (100ms) */
/*
* These variables are used similarly to openLogFile/Id/Seg/Off,
@ -396,7 +396,7 @@ WalSndLoop(void)
* sleep into NAPTIME_PER_CYCLE (ms) increments, and check for
* interrupts after each nap.
*/
remain = WalSndDelay;
remain = WalSndDelay * 1000L;
while (remain > 0)
{
if (got_SIGHUP || shutdown_requested || ready_to_stop)