Message-ID: <53F506B5.1040507@optionshouse.com>
Date: Wed, 20 Aug 2014 15:36:05 -0500
From: Shaun Thomas <sthomas@optionshouse.com>
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To: Josh Berkus <josh@agliodbs.com>, <pgsql-performance@postgresql.org>
CC: Mark Kirkwood <mark.kirkwood@catalyst.net.nz>, "Graeme B. Bell"
 <grb@skogoglandskap.no>
Subject: Re: Turn off Hyperthreading! WAS: 60 core performance with
 9.3
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 <WM!d3faee1472c3c4b0fa7a14ce4fee2175ef92f1e0d7e7edb62fe3bcc6fa7e486c99870994a65fa43cc61df990ae549575!@asav-2.01.com>
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 <WM!14a45a34c8080927967621cff2751e173aba58b17a2748a7a628c8fd3be56f3c9596f20e774ed5df15c6863316278466!@asav-2.01.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@optionshouse.com

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