Re: New to PostgreSQL, performance considerations - Mailing list pgsql-performance

From Alexander Staubo
Subject Re: New to PostgreSQL, performance considerations
Date
Msg-id 2FC0D8E7-F8ED-452F-BB13-FB665B516E7F@purefiction.net
Whole thread Raw
In response to Re: New to PostgreSQL, performance considerations  ("Daniel van Ham Colchete" <daniel.colchete@gmail.com>)
Responses Re: New to PostgreSQL, performance considerations  (Michael Stone <mstone+postgres@mathom.us>)
List pgsql-performance
On Dec 11, 2006, at 23:22 , Daniel van Ham Colchete wrote:

> I ran this test at a Gentoo test machine I have here. It's a Pentium 4
> 3.0GHz (I don't know witch P4)

Try cat /proc/cpuinfo.

> TESTS RESULTS
> ==============

On a dual-core Opteron 280 with 4G RAM with an LSI PCI-X Fusion-MPT
SAS controller, I am getting wildly uneven results:

tps = 264.775137 (excluding connections establishing)
tps = 160.365754 (excluding connections establishing)
tps = 151.967193 (excluding connections establishing)
tps = 148.010349 (excluding connections establishing)
tps = 260.973569 (excluding connections establishing)
tps = 144.693287 (excluding connections establishing)
tps = 148.147036 (excluding connections establishing)
tps = 259.485717 (excluding connections establishing)

I suspect the hardware's real maximum performance of the system is
~150 tps, but that the LSI's write cache is buffering the writes. I
would love to validate this hypothesis, but I'm not sure how.

Alexander.

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