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From: Sven Geisler <sgeisler@aeccom.com>
To: Guillaume Smet <guillaume.smet@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: PostgreSQL and Xeon MP
Date: Thu, 16 Mar 2006 17:36:52 +0100
Message-ID: <44199424.1080107@aeccom.com> (raw)
In-Reply-To: <1d4e0c10603160805n6d727a94ic2ab0ed0bcf56c1a@mail.gmail.com>
References: <1d4e0c10603160245n55128e86t35431a339afcf8cc@mail.gmail.com>
	<44194A4B.3020106@archonet.com>
	<1d4e0c10603160428s1a3c1f4cocbe8489634524387@mail.gmail.com>
	<441963F4.1010607@aeccom.com>
	<1d4e0c10603160617w5d5aadc7o553103694fc3ca08@mail.gmail.com>
	<4419823F.6060205@aeccom.com>
	<1d4e0c10603160805n6d727a94ic2ab0ed0bcf56c1a@mail.gmail.com>

Hi Guillaume,

Guillaume Smet schrieb:
>> How much faster is the XEON DP?
> 
> Well, on high load, PostgreSQL scales well on the DP (load at 40,
> queries slower but still performing well) and is awfully slow on the
> MP box.

I know what you mean with awfully slow.
I think, your application is facing contention. The contention becomes 
larger as more CPU you have. PostgreSQL 8.1 is addressing contention on 
multiprocessor servers as you mentioned before.

I guess, you will see that your 4-way XEON MP isn't that bad if you 
compare both servers with the same PostgreSQL version.

Regards
Sven.

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