From: Guillaume Smet <guillaume.smet@gmail.com>
To: Greg Smith <gsmith@gregsmith.com>
Cc: pgsql-performance <pgsql-performance@postgresql.org>
Subject: Re: More shared buffers causes lower performances
Date: Wed, 26 Dec 2007 22:52:04 +0100
Message-ID: <1d4e0c10712261352j2fbcd25ek1270331468d824b4@mail.gmail.com> (raw)
In-Reply-To: <Pine.GSO.4.64.0712261316580.11546@westnet.com>
References: <1d4e0c10712251606q6f9503deye3da4b68c51bf5e@mail.gmail.com>
<1198668065.4221.288.camel@ebony.site>
<1d4e0c10712260741w1f141fd6x2f482143d526ad48@mail.gmail.com>
<Pine.GSO.4.64.0712261316580.11546@westnet.com>
On Dec 26, 2007 7:23 PM, Greg Smith <gsmith@gregsmith.com> wrote:
> Ah, now this is really interesting, as it rules out all the write
> components and should be easy to replicate even on a smaller server. As
> you've already dumped a bunch of time into this the only other thing I
> would suggest checking is whether the same behavior also happens on 8.2 on
> your server.
Let's go with 8.2.5 on the same server (-s 100 / 16 clients / 50k
transactions per client / only read using -S option):
64MB: 33814 tps
512MB: 35833 tps
1024MB: 36986 tps
It's more consistent with what I expected.
I used PGDG RPMs compiled by Devrim for 8.2.5 and the ones I compiled
myself for 8.3b4 (based on the src.rpm of Devrim). I just asked Devrim
to build a set of x86_64 RPMs for 8.3b4 to see if it's not a
compilation problem (they were compiled on a brand new box freshly
installed so it would be a bit surprising but I want to be sure). He's
kindly uploading them right now so I'll work on new tests using his
RPMs.
I'll keep you informed of the results.
--
Guillaume
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To: pgsql-performance@postgresql.org
Cc: guillaume.smet@gmail.com, gsmith@gregsmith.com
Subject: Re: More shared buffers causes lower performances
In-Reply-To: <1d4e0c10712261352j2fbcd25ek1270331468d824b4@mail.gmail.com>
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