RES: Context switching

Hi,

Sorry, but this message was already post some days before!

Thank you!

Carlos

-----Mensagem original-----
De: pgsql-performance-owner(at)postgresql(dot)org
[mailto:pgsql-performance-owner(at)postgresql(dot)org]Em nome de Carlos H. Reimer
Enviada em: quarta-feira, 1 de novembro de 2006 03:23
Para: pgsql-performance(at)postgresql(dot)org
Assunto: [PERFORM] Context switching

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(dot)reimer(at)opendb(dot)com(dot)br
OpenDB Serviços e Treinamentos PostgreSQL e DB2
Fone: 47 3327-0878 Cel: 47 9602-0151
www.opendb.com.br