Author: Christophe Theron
Date: 15:39:41 05/28/98
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On May 28, 1998 at 16:02:52, Georg Langrath wrote:
>I have just bought Fritz5, and I am very satisfied with it. But there is
>a disadvantage with it that everybody that want to buy it should be
>aware of. It is enormously memoryhungry. In the manual they recommend 72
>MB! memory for a Pentium 200 in average 3-minutes play. And it is so.
>When the beast has eaten the hashmemory it nearly stops analyzing. To
>analyze longer time for example 15 minutes is impossible for usual
>homecomputers.
>I myself always play on shorter time, so my memory is enough (32MB on
>Pentum133). But if I should like to play tournament level I had to
>upgrade. The formula according to manual is 2 x HZ x minutes.
>
>Georg
Sorry Georg, but unless I understand nothing about computer chess
programming, when the hash table is full the program DOES keep on
analyzing. Maybe you get a few percent slowdown, but the program in no
way stops analyzing!
I guess the manual just warns you that you should have more memory to
get ABSOLUTE optimum performances at longer time controls, but with less
memory you are just a few percent under this optimal curve.
That's all.
This issue has been discussed several times here. Maybe Fritz manual
warns you too much with too heavy words, but thinking that the analysis
nearly stops is a common mistake among computer chess users. I wonder
why...
Anyway, you can be sure that your 32Mb is not that bad.
With my program, Chess Tiger, I usually get a few percent speedup a long
time controls when I increase my hash table size from 16Mb to 32Mb. What
a big deal!
BTW, I have read several times here that Fritz takes advantage of more
hash tables, and need them in fact, but I don't remember somebody kind
enough to post here some real data. Isn't time to show some numbers so
this legend can be verified? I would have done it myself, but I don't
have Fritz5...
If somebody posts real numbers, I will do the same kind of experiment
with Chess Tiger and others programs I have.
Christophe
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