[CentOS] HT (Hyper Threading) on CentOS 5.5
Sorin Srbu
sorin.srbu at orgfarm.uu.se
Fri Mar 9 08:05:15 UTC 2012
-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf
Of John R Pierce
Sent: den 9 mars 2012 08:54
To: centos at centos.org
Subject: Re: [CentOS] HT (Hyper Threading) on CentOS 5.5
On 03/08/12 11:44 PM, Sorin Srbu wrote:
> I know there might be some negative performance issues with certain
> applications, but would you notice it in day-to-day use?
if you're using the server for pure floating point compute, don't run
more threads than you have actual cores. high concurrency server
workloads that aren't IO bound generally benefit quite a lot from using
hyperthreads to double the number of active workers. the HT on the
X5600 and such newer Xeons is quite a lot better than the old
netburst/p4 architecture where the benefits were marginal in many cases.
===================
Thanks.
--
/Sorin
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