Author: Christophe Theron
Date: 22:23:32 05/28/98
Go up one level in this thread
On May 28, 1998 at 20:01:08, Enrique Irazoqui wrote:
>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
>
>On a PII/300
> 100MB 50MB 25MB
>BS2830-14 208'' 224'' 301''
>BT2630-09 404'' 406'' 435''
>
>
>On a P200MMX
> 100MB 40MB 22MB
>BT2630-09 524'' 560''
>Fritzmark 174 156 154
>
>Chessbase claim that by increasing hashtables from 40 MB to 100 MB on a
>P200MMX, Fritz 5 is 50 Elo points stronger. It doesn't make sense to me
>that doubling RAM has the same effect as doubling the processor speed.
>After the times above, maybe going from 25 to 100 MB hash Friz 5 can
>become some 20 points stronger.
>
>Enrique
Thanks for the concrete data, Enrique.
So we can see on these positions that Fritz gains 31% in speed on
BS2830-14, and 7% on BT2630-09 when we give it 4x times more hash
tables.
Could you please post the positions in EPD format, so I will be able to
give the results for Tiger as promised?
Christophe
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