Hyper threading?

From: Mariusz Czułada <manieq(at)idea(dot)net(dot)pl>
To: pgsql-performance(at)postgresql(dot)org
Subject: Hyper threading?
Date: 2004-09-21 08:54:48
Message-ID: 200409211054.48574.manieq@idea.net.pl
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Hi all,

I searched list archives, but did not found anything about HT of Pentium
4/Xeon processors. I wonder if hyperthreading can boost or decrease
performance. AFAIK for other commercial servers (msssql, oracle) official
documents state something like "faster, but not always, so probably slower,
unless faster". User opinions are generaly more clear: better swhitch off HT.

Do you have any experiance or test results regarding hyperthreading? Or what
additional conditions can make HT useful or pointless?

TIA,

Mariusz

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