Re: raid array seek performance

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On 09/13/2011 03:13 PM, Samuel Gendler wrote:
Bonnie++ delivered the expected huge throughput for sequential read and write. It seems in line with other benchmarks I found online. However, we are only seeing 180 seeks/sec, but seems quite low.

I wouldn't worry about that if the sequential rates are good. The bonnie++ seeks test has been giving me increasingly useless results recently on modern hardware. And bonnie++ 1.96 continues to give me enough weird values that I'm still using 1.03e as my standard version.

If you want to get a useful measurement of seeks/second, setup pgbench-tools with a SELECT-only test, and create a database that's 2 to 4X as big as RAM. The TPS result you get from that is a much more useful number for real-world seeks than this.

I'm working on a tool to directly benchmark seek performance in a way that's useful for what people really want to know nowadays. That's going live to the world at the end of the month, at #PgWest: http://pgwest2011.sched.org/event/875b87d8d237bef3a53ab27ac9c8057c

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Greg Smith   2ndQuadrant US    greg@xxxxxxxxxxxxxxx   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support  www.2ndQuadrant.us


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