| From: | Eric Soroos <eric-psql(at)soroos(dot)net> |
|---|---|
| To: | Jack Coates <jack(at)lyris(dot)com> |
| Cc: | pgsql-performance <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: tuning questions |
| Date: | 2003-12-04 22:59:45 |
| Message-ID: | 8DABDA81-26AD-11D8-8622-0003930F2A6C@soroos.net |
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| Lists: | pgsql-hackers pgsql-performance |
>
> IO is active, but hardly saturated. CPU load is hefty though, load
> average is at 4 now.
>
> procs memory swap io
> system cpu
> r b w swpd free buff cache si so bi bo in cs
> us sy id
> 0 2 1 2808 11432 39616 1902984 0 0 204 876 788 507
> 3 4 93
You're getting a load average of 4 with 93% idle?
That's a reasonable number of context switches, and if the blocks
you're reading/writing are discontinous, I could see io saturation
rearing it's head.
This looks to me like you're starting and killing a lot of processes.
Is this thrashing psql connections, or is it one big query? What are
your active processes?
Your effective cache size looks to be about 1900 megs (+- binary),
assuming all of it is pg.
eric
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