Re: Turn off Hyperthreading! WAS: 60 core performance with 9.3

From: Shaun Thomas <sthomas(at)optionshouse(dot)com>
To: Josh Berkus <josh(at)agliodbs(dot)com>, <pgsql-performance(at)postgresql(dot)org>
Cc: Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>, "Graeme B(dot) Bell" <grb(at)skogoglandskap(dot)no>
Subject: Re: Turn off Hyperthreading! WAS: 60 core performance with 9.3
Date: 2014-08-20 20:36:05
Message-ID: 53F506B5.1040507@optionshouse.com
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On 08/20/2014 02:13 PM, Josh Berkus wrote:

> So we're definitely back to "If you're using PostgreSQL, turn off
> Hyperthreading".

That's so strange. Back when I did my Nehalem tests, we got a very
strong 30%+ increase by enabling HT. We only got a hit when we turned
off turbo, or forgot to disable power saving features.

--
Shaun Thomas
OptionsHouse, LLC | 141 W. Jackson Blvd. | Suite 800 | Chicago IL, 60604
312-676-8870
sthomas(at)optionshouse(dot)com

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