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Subject: Re: Is Fruit 2.2 weakened by additional security code?

Author: Tord Romstad

Date: 02:54:04 10/11/05

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On October 11, 2005 at 04:08:36, Andreas Guettinger wrote:

>What's intersting is that the kn/s on my Athlon64 3400 is quite different
>between Fruit2.1 and Fruit2.2.
>Fruit 2.1 around 900 kn/s in middlegame
>Fruit 2.2 around 550 kn/s in middlegame.
>
>Maybe more knowledge or badly optimized compile?

Fruit 2.2 uses futility pruning and extended futility pruning, which
Fruit 2.1 did not (IIRC).  Futility pruning tends to slow down the n/s
count considerably.

Tord




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