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Re: Possible Bug: high CPU usage for stats collector in 8.2

From: Darcy Buskermolen <darcyb(at)commandprompt(dot)com>
To: pgsql-hackers(at)postgresql(dot)org
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Subject: Re: Possible Bug: high CPU usage for stats collector in 8.2
Date: 2007-03-02 21:41:18
Message-ID: 200703021341.19299.darcyb@commandprompt.com (view raw or flat)
Thread:
Lists: pgsql-hackers
On Thursday 01 March 2007 11:57, Tom Lane wrote:
> Darcy Buskermolen <darcyb(at)commandprompt(dot)com> writes:
> > I'm observing high CPU usage (95%) of a 2.6GHz opteron by the stats
> > collector on an 8.2.3 box  investigation has lead me to belive that the
> > stats file is written a lot more often that once every 500ms  the
> > following shows this behavior.
>
> Looks like someone broke the usage of PGSTAT_STAT_INTERVAL between 8.1
> and 8.2 ... it's waiting 500 microseconds, not the intended 500
> milliseconds.

I can confirm that rev 1.140.2.3 of pgstat.c does fix this issue.

The stats collector CPU usage has dropped from inexcess of 95% to 5%

Thanks.

>
> 			regards, tom lane
>
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-- 


Darcy Buskermolen
The PostgreSQL company, Command Prompt Inc.
http://www.commandprompt.com/

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