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On Fri, 22 Feb 2008 12:54:00 -0500
Tom Lane <tgl@sss.pgh.pa.us> wrote:
> "Joshua D. Drake" <jd@commandprompt.com> writes:
> > Tom Lane <tgl@sss.pgh.pa.us> wrote:
> >> IIRC we were speculating that data was being written
> >> in a pattern that required a lot of seeking thus ruining
> >> throughput, but we didn't have any hard evidence of that. Did you
> >> do the strace'ing I suggested?
>
> > Yes, I asked if you wanted counts or the whole output. You didn't
> > answer :). I provided the counts.
>
> Uh, sorry. Counts are useless here, we need to see the sequence of
> write locations to find out if there's a lot of nonconsecutive
> writes happening. BTW, the strace had better run across the whole
> PG process tree --- it's quite possible that there's some interaction
> between the bgwriter and the backend doing COPY, for instance.
So you want an strace on postmaster not the connection?
Sincerely,
Joshua D. Drake
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