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Re: hyperthreaded cpu still an issue in 8.4?

From: Grzegorz Jaśkiewicz <gryzman(at)gmail(dot)com>
To: Doug Hunley <doug(at)hunley(dot)homeip(dot)net>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: hyperthreaded cpu still an issue in 8.4?
Date: 2009-07-21 13:53:44
Message-ID: 2f4958ff0907210653t5284316ah18320e456fd50b62@mail.gmail.com (view raw or flat)
Thread:
Lists: pgsql-performance
On Tue, Jul 21, 2009 at 1:42 PM, Doug Hunley<doug(at)hunley(dot)homeip(dot)net> wrote:
> Just wondering is the issue referenced in
> http://archives.postgresql.org/pgsql-performance/2005-11/msg00415.php
> is still present in 8.4 or if some tunable (or other) made the use of
> hyperthreading a non-issue. We're looking to upgrade our servers soon
> for performance reasons and am trying to determine if more cpus (no
> HT) or less cpus (with HT) are the way to go. Thx

I wouldn't recommend HT CPUs at all. I think your assumption, that HT
== CPU is wrong in first place.
Please read more about HT on intel's website.



-- 
GJ

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