From: Christopher Petrilli <petrilli@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: PFC <lists@boutiquenumerique.com>
Cc: Vivek Khera <vivek@khera.org>
Cc: pgsql-performance@postgresql.org
Subject: Re: Impact of checkpoint_segments under continual load conditions
Date: Tue, 19 Jul 2005 14:48:54 -0400
Message-ID: <59d991c40507191148e6f9ec5@mail.gmail.com> (raw)
In-Reply-To: <7843.1121796596@sss.pgh.pa.us>
References: <59d991c4050717100874c08a86@mail.gmail.com>
<op.st52tvunth1vuj@localhost>
<59d991c4050719084460b376f1@mail.gmail.com>
<4541.1121788647@sss.pgh.pa.us>
<59d991c40507190930244ba9bb@mail.gmail.com>
<7224.1121791328@sss.pgh.pa.us>
<59d991c4050719095440cd3de5@mail.gmail.com>
<7436.1121792725@sss.pgh.pa.us>
<59d991c405071910133e28031a@mail.gmail.com>
<7843.1121796596@sss.pgh.pa.us>
On 7/19/05, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Christopher Petrilli <petrilli@gmail.com> writes:
> >> Are you sure the backend is reading directly from the file, and not
> >> through psql? (\copy, or COPY FROM STDIN, would go through psql.)
>
> > The exact command is:
> > COPY test (columnlist...) FROM '/tmp/loadfile';
>
> I tried to replicate this by putting a ton of COPY commands like that
> into a file and doing "psql -f file ...". I don't see more than about
> 0.3% CPU going to psql. So there's something funny about your test
> conditions. How *exactly* are you invoking psql?
It is a subprocess of a Python process, driven using a pexpect
interchange. I send the COPY command, then wait for the '=#' to come
back.
Chris
--
| Christopher Petrilli
| petrilli@gmail.com
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To: pgsql-performance@postgresql.org
Cc: petrilli@gmail.com, tgl@sss.pgh.pa.us, lists@boutiquenumerique.com, vivek@khera.org
Subject: Re: Impact of checkpoint_segments under continual load conditions
In-Reply-To: <59d991c40507191148e6f9ec5@mail.gmail.com>
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