Postgres benchmarking with pgbench

From: "ml(at)bortal(dot)de" <ml(at)bortal(dot)de>
To: pgsql-performance(at)postgresql(dot)org
Subject: Postgres benchmarking with pgbench
Date: 2009-03-16 10:48:36
Message-ID: 49BE2E84.2040506@bortal.de
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Hello List,

i would like to pimp my postgres setup. To make sure i dont have a slow
hardware, i tested it on three diffrent enviorments:
1.) Native Debian Linux (Dom0) and 4GB of RAM
2.) Debian Linux in Xen (DomU) 4GB of RAM
3.) Blade with SSD Disk 8GB of RAM

Here are my results: http://i39.tinypic.com/24azpxg.jpg

Here is my postgres config: http://pastebin.com/m5e40dbf0

Here is my sysctl:
----------------------------------
kernel.shmmax = 3853361408
kernel.shmall = 99999999

Here is my pgbench benchmark script: http://pastebin.com/m676d0c1b

Here are my hardware details:
========================

On Hardware 1 + 2 (native linux and debian) i have the following
Hardware underneath:
--------------------------------------------------------------------------------------------------------------------------------------------------------
- ARC-1220 8-Port PCI-Express on Raid6 with normal SATA drives 7200RPM
- 1x Quadcore Intel(R) Xeon(R) CPU E5320 @ 1.86GHz

The Blade:
----------------------------
- 2x 16GB SSD set up in striping mode (Raid 0)
- 2x Quardcore Intel(R) Xeon(R) CPU E5420 @ 2.50GHz

Any idea why my performance colapses at 2GB Database size?

Thanks,
Mario

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