Re: Hyperthreading and Dual Core

Gian-Carlo Pascutto wrote:
Jud McCranie wrote:
On Wed, 21 Jun 2006 15:51:58 GMT, Gian-Carlo Pascutto
<natrese@xxxxxxxxxxx> wrote:


true multiprocessor. For hyperthreading, the speedups are basically
nonexistant (which isn't surprising, since you really *dont* have extra
processing units).

In tests or other programs, I thin khyperthreading gives a 10-15%
boost.

In terms of nodes-per-second, yes. But no speedup in terms of actually
finding the right moves faster.


Agree.
In fact my tests showed that HyperTreading can be damaging for the play of some engines in some situations. Therefore I started to switch off the 2. tread in all engines smp-capable when playing them on that machine.
.

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