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Tuning Postgres 9.1 on Windows

From: "Walker, James Les" <JAWalker(at)cantor(dot)com>
To: "'pgsql-performance(at)postgresql(dot)org'" <pgsql-performance(at)postgresql(dot)org>
Subject: Tuning Postgres 9.1 on Windows
Date: 2012-04-30 13:49:41
Message-ID: 21BFB59709EBB84DB412ED7F739FFD3B19E5E3@TBPINFN0203.cad.local (view raw or flat)
Thread:
Lists: pgsql-performance
I'm trying to benchmark Postgres vs. several other databases on my workstation. My workstation is running 64 bit Windows 7. It has 12 gb of RAM and a W3550 @ 3 Ghz. I installed Postgres 9.1 using the windows installer. The data directory is on a 6Gb/s SATA SSD.

My application is multithreaded and uses pooled connections via JDBC. It's got around 20 threads doing asynchronous transactions against the database. It's about 70% read/30% write. Transactions are very small. There are no long-running transactions. I start with an empty database and I only run about 5,000 business transactions in my benchmark. That results in 10,000 - 15,000 commits.

When I first installed Postgres I did no tuning at all and was able to get around 40 commits per-second which is quite slow. I wanted to establish a top-end so I turned off synchronous commit and ran the same test and got the same performance of 40 commits per second. I turned on the "large system cache" option on Windows 7 and got the same results. There seems to be some resource issues that's limiting me to 40 commits per second but I can't imagine what it could be or how to detect it.

I'm not necessarily looking for advice on how to increase performance, but I at least need to know how to find the bottleneck.

-- Les Walker

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Next:From: Andy ColsonDate: 2012-04-30 16:26:15
Subject: Re: Tuning Postgres 9.1 on Windows
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Subject: Re: NOT EXISTS or LEFT JOIN which one is better?

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