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Subject: Re: OT: P4- 3 GHz with hyper-threading

Author: Vincent Diepeveen

Date: 07:53:07 10/31/02

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On October 30, 2002 at 06:59:21, Terje Vagle wrote:

>Hi all,
>
>The new cpu from intel will have a new function called
>hyper-threading.
>
>This will make the operating system able to recognize the cpu as if it was
>2 cpu's.
>
>Could the programs with smp-support make use of this?
>
>Regards,
>
>Terje Vagle

No chessprograms cannot make use of that feature at all. It is sad but
the truth. Hyperthreading is a cool thing for the future but the P4
processor is a too small processor to allow hyperthreading from getting
to work.

Apart from that a major problem is that even if we have a great processor
which really allows hyperthreading to be effective, that the threads
run at unequal speeds.

Hyper threading is supposed to work for 2 threads where 1 is a fast
thread and the other is some kind of background thread eating little cpu
time.

In chessprograms having a second search thread which just runs now and
then in the background is simply impossible to use.





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