Re: resource monitoring

Rick Gigger wrote:

> I am running a few web based applications with postgres on the
> backend. We have a few app servers load balanced all connecting to a
> dedicated postgres server. As usage on the applications increases I
> want to monitor my resources so that I can anticipate when I will hit
> bottlenecks on the db server. That way we can do upgrades or
> optimizations before our performance get's unacceptable.
>
> We are monitoring cpu usage, memory usage, and network traffic. I
> would also like to monitor io utilization but am not quite sure how to
> do that. Does anyone here know to effetively monitor io to the raid
> (I'm guessing that this could be measured with the raid management
> software but was hoping their were some standard system commands.) or
> other io that I should be measuring?
>
> What bottlenecks could I hit and what are some good stats to check to
> anticipate when I am moving towards one of those bottlenecks.
>
> Thanks,
>
> Rick
>
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I use top to measure cpu and memory usage, vmstat to measure disk io,
and pg_stat_activity to see which query is hogging the cpu, memory or
io. We don't use raid so I'm not sure how vmstat deals with that.
So your mileage may vary :-)
Ron