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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: Wed, 20 Jul 2005 11:52:52 -0400
Message-ID: <59d991c405072008523c6914bc@mail.gmail.com> (raw)
In-Reply-To: <59d991c4050719122213ac3d81@mail.gmail.com>
References: <59d991c4050717100874c08a86@mail.gmail.com>
	<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>
	<59d991c40507191148e6f9ec5@mail.gmail.com>
	<8375.1121799193@sss.pgh.pa.us>
	<59d991c4050719122213ac3d81@mail.gmail.com>

On 7/19/05, Christopher Petrilli <petrilli@gmail.com> wrote:
> On 7/19/05, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> > Christopher Petrilli <petrilli@gmail.com> writes:
> > > On 7/19/05, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> > >> 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.
> >
> > Some weird interaction with pexpect maybe?  Try adding "-n" (disable
> > readline) to the psql command switches.
> 
> Um... WOW!
> It doesn't stay QUITE that low, but it stays lower... quite a bit.
> We'll see what happens over time.

here's a look at the difference:

http://blog.amber.org/diagrams/pgsql_readline_impact.png

I'm running additional comparisons AFTER clustering and analyzing the tables... 

Chris
-- 
| Christopher Petrilli
| petrilli@gmail.com



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