From: Carlos H. Reimer <carlos.reimer@opendb.com.br>
To: pgsql-performance@postgresql.org
Subject: Context switching
Date: Wed, 1 Nov 2006 03:23:17 -0200
Message-ID: <PEEPKDFEHHEMKBBFPOOKKEDCDGAA.carlos.reimer@opendb.com.br> (raw)
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 can produce this context switching storms?
It is a box with 12GB RAM and 4 processors running RedHat Enterprise Linux
AS.
Thank you in advance!
Reimer
carlos.reimer@opendb.com.br
OpenDB Serviços e Treinamentos PostgreSQL e DB2
Fone: 47 3327-0878 Cel: 47 9602-0151
www.opendb.com.br
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To: pgsql-performance@postgresql.org
Cc: carlos.reimer@opendb.com.br
Subject: Re: Context switching
In-Reply-To: <PEEPKDFEHHEMKBBFPOOKKEDCDGAA.carlos.reimer@opendb.com.br>
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