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Subject: Re: Hammer info. And som SMP musings.

Author: Tom Kerrigan

Date: 13:09:55 03/23/02

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On March 23, 2002 at 13:38:45, Dan Andersson wrote:

>SMT is of little or no consequence to chess programs. It might even slow it
>down. You don't think it automatically doubles the amount of functional units on
>a given CPU, do you?

You're completely missing the point. SMT was invented and implemented because
most of a chip's functional units are idle at any given point in time--using
them for another thread gives you free performance.

I haven't seen any benchmarks yet, but a quad P4 Xeon will appear to software as
an 8-way system and while it will probably not be as fast as a full-on 8-way
system, it will be much faster than a 4-thread system.

-Tom



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