Re: Hyperthreading (was: Two identical systems, radically different performance)

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Craig James <cjames(at)emolecules(dot)com>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: Hyperthreading (was: Two identical systems, radically different performance)
Date: 2012-10-09 20:53:12
Message-ID: 6247.1349815992@sss.pgh.pa.us
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Craig James <cjames(at)emolecules(dot)com> writes:
> I've confirmed that hyperthreading causes a huge drop in performance on a
> 2x4-core Intel Xeon E5620 2.40GHz system. The bottom line is:

Interesting.

> I'll be upgrading to 8.4.14 and making more changes to postgres.conf based
> on feedback. The server is available for a day or so for more tests if
> anyone has suggestions.

It would be nice to see similar tests done with 9.2. 8.4 is kind of old
news as far as server performance is concerned.

regards, tom lane

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