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Context switch storm
- From: creimer(at)brturbo(dot)com(dot)br
- To: pgsql-performance(at)postgresql(dot)org
- Subject: Context switch storm
- Date: Fri, 03 Nov 2006 08:32:13 -0200
Hi,
We've migrated one of our servers from pg 7.4 to 8.1 and from times to times (4 hours) the server start doing a lot of context switching and all transactions become very slow.
The average context switching for this server as vmstat shows is 1 but when the problem occurs it goes to 250000.
CPU and memory usage are ok.
What is producing this context switching storms?
It is a box with 16GB RAM and 4 XEON processors running RedHat Enterprise Linux AS.
Should I disable Hyperthreading?
Thank you in advance!
Reimer
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