Author: Georg Langrath
Date: 23:50:35 05/28/98
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On May 28, 1998 at 18:39:41, Christophe Theron wrote: >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 Yes I believe you. I took the words of the manual for the truth. One thing that makes you feel something is wrong is the square that says "FULL", when the hashmemory is over. It gets you the feeling that something is wrong. As I see it they will loose buyers if they exaggerate the demands of hardware. I can’t see the point. And now I think I shall test Fritz5 with different hashtables too compare the effect. Georg
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