Context switching

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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@xxxxxxxxxxxxx
OpenDB Serviços e Treinamentos PostgreSQL e DB2
Fone: 47 3327-0878 Cel: 47 9602-0151
www.opendb.com.br

 

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