Author: Enrique Irazoqui
Date: 03:04:42 05/29/98
Go up one level in this thread
On May 29, 1998 at 01:23:32, Christophe Theron wrote: >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 BS2830-14: r1bqr1k1/pp1n1ppp/5b2/4N1B1/3p3P/8/PPPQ1PP1/2K1RB1R w - - 0 0 bm Nxf7 BT2630-09: r5k1/pp2p1bp/6p1/n1p1P3/2qP1NP1/2PQB3/P5PP/R4K2 b - - 0 0 bm g5 It's true that many more positions are needed to make sure about the influence of hash size on Fritz 5, but I am too lazy to collect so much data. I picked 2 positions where F5 uses an amount of time typical of games at 40/2. Enrique
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