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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Christopher Petrilli <petrilli@gmail.com>
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 14:09:56 -0400
Message-ID: <7843.1121796596@sss.pgh.pa.us> (raw)
In-Reply-To: <59d991c405071910133e28031a@mail.gmail.com>
References: <59d991c4050717100874c08a86@mail.gmail.com>
	<16794.1121718743@sss.pgh.pa.us>
	<59d991c405071907482bb0689b@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>

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?

			regards, tom lane



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