Re: Processor Speed on Linux
- From: Paul Drake <bdbafh@xxxxxxxxx>
- To: dbvision@xxxxxxxxxxxx
- Date: Wed, 17 Aug 2005 09:40:04 -0400
On 8/17/05, Nuno Souto <dbvision@xxxxxxxxxxxx> wrote:
> Marquez, Chris apparently said,on my timestamp of 17/08/2005 2:30 AM:
> > Be careful...with Intel HYPER THREADING two physical CPU is reported and
> > seen as four physical CPU.
> >
>
>
> When you do cat /proc/cpuinfo, check out the flags field.
> If it has the string "ht" in it, it's a hyper thread chip.
>
> --
> Cheers
> Nuno Souto
> in sunny Sydney, Australia
> dbvision@xxxxxxxxxxxx
Also-
check dmesg for mapping of the hyperthreaded cpu onto the runqueue of
the physical processor. In top, one can see on a lightly loaded
server, processes run on the 2 physical CPUs first (on a RHEL ES
kernel - update 5).
Paul
--
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