When grilled further on (Wed, 19 May 2004 21:20:20 -0400 (EDT)), Bruce Momjian <[EMAIL PROTECTED]> confessed:
> > Did we ever come to a conclusion about excessive SMP context switching > under load? > I just figured out what was causing the problem on my system Monday. I'm using the pg_autovacuum daemon, and it was not vacuuming my db. I've no idea why and didn't get a chance to investigate. This lack of vacuuming was causing a huge number of context switches and query delays. the queries that normally take .1 seconds were taking 11 seconds, and the context switches were averaging 160k/s, peaking at 190k/s Unfortunately, I was under pressure to fix the db at the time so I didn't get a chance to play with the patch. I restarted the vacuum daemon, and will keep an eye on it to see if it behaves. If the problem re-occurs, is it worth while to attempt the different patch delay settings? Cheers, Rob -- 19:45:40 up 21 days, 2:30, 4 users, load average: 2.03, 2.09, 2.06 Linux 2.6.5-01 #7 SMP Fri Apr 16 22:45:31 MDT 2004
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