From: Anton Rommerskirchen <atr@atrsoft.de>
To: pgsql-performance@postgresql.org
Subject: Re: strange performance regression between 7.4 and 8.1
Date: Fri, 2 Mar 2007 18:45:44 +0100
Message-ID: <200703021845.44225.atr@atrsoft.de> (raw)
In-Reply-To: <a728f9f90703011244r577d56d7y422ab4bd71bb760e@mail.gmail.com>
References: <a728f9f90703011244r577d56d7y422ab4bd71bb760e@mail.gmail.com>
Am Donnerstag 01 März 2007 21:44 schrieb Alex Deucher:
> Hello,
>
> I have noticed a strange performance regression and I'm at a loss as
> to what's happening. We have a fairly large database (~16 GB). The
> original postgres 7.4 was running on a sun v880 with 4 CPUs and 8 GB
> of ram running Solaris on local scsi discs. The new server is a sun
> Opteron box with 4 cores, 8 GB of ram running postgres 8.1.4 on Linux
> (AMD64) on a 4 Gbps FC SAN volume. When we created the new database
> it was created from scratch rather than copying over the old one,
> however the table structure is almost identical (UTF8 on the new one
> vs. C on the old). The problem is queries are ~10x slower on the new
> hardware. I read several places that the SAN might be to blame, but
> testing with bonnie and dd indicates that the SAN is actually almost
> twice as fast as the scsi discs in the old sun server. I've tried
> adjusting just about every option in the postgres config file, but
> performance remains the same. Any ideas?
>
1. Do you use NUMA ctl for locking the db on one node ?
2. do you use bios to interleave memeory ?
3. do you expand cache over mor than one numa node ?
> Thanks,
>
> Alex
>
> ---------------------------(end of broadcast)---------------------------
> TIP 3: Have you checked our extensive FAQ?
>
> http://www.postgresql.org/docs/faq
--
ATRSoft GmbH
Rosellstrasse 9
D 50354 Hürth
Deutschland
Tel .: +49(0)2233 691324
Geschäftsführer Anton Rommerskirchen
Köln HRB 44927
STNR 224/5701 - 1010
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: atr@atrsoft.de
Subject: Re: strange performance regression between 7.4 and 8.1
In-Reply-To: <200703021845.44225.atr@atrsoft.de>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox