Re: hyperthread advice needed

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Thu, 19 May 2005 07:02:31 +0000 (UTC)
Message-ID: <d6hdm7$4m7$1@nwrdmz03.dmz.ncs.ea.ibs-infra.bt.com>

"astalavista" <spam_at_nowhere.com> wrote in message news:4285aad7$0$582$626a14ce_at_news.free.fr...
> hi,
>
> I use 10.1.0.3 on Proliant DL380 on Redhat AS 4
> what is the best configuration,
> hyperthread enabled or disabled ?
> Nothing usefull on google and metalink ...
>
> Thanks in advance
>
>
>
>
>

If you are planning to run a typical multi-user type of environment, it is probably better to enable hyperthreading - this allows Oracle to see you have two (logical) CPUs and use some code paths that maximise concurrency.

If a very large fraction of your work is going to be effectively single-user, single-stream, massive CPU crunching, then you may get some benefit by disabling hyperthreading as there seems to be a scheduling overhead at the CPU level when you hyperthread, and you don't want this if you are trying to run just one big CPU task.

-- 
Regards

Jonathan Lewis

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Received on Thu May 19 2005 - 02:02:31 CDT