Author: martin fierz
Date: 21:39:19 10/18/02
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On October 19, 2002 at 00:27:44, Koundinya Veluri wrote: >On October 18, 2002 at 18:43:15, Gian-Carlo Pascutto wrote: > >>On October 18, 2002 at 18:35:32, martin fierz wrote: >> >>>so your book doesn't fit into your memory? wow, that thing must be huge! or >>>maybe it's just that i'm spoiled with my GB-machine :-) >> >>On my machine it does, but I don't want to make the assumption it >>will on all machines, so the code uses fseek/fread/fwrite. >> >>I have 768M RAM. The book is 16M, the PGN is 153M. Windows is >>*continously* busy with the disk and my program is getting <5% >>CPU time. That's redicolous. > >If your pgn is too fragmented, that would explain the heavy disk access. Try >defragmenting it. I've built books from some huge pgn files that were much >larger than my ram and still had no problems. Even disabling caching completely >shouldn't slow the program down that much. Probably your pgn file is fragmented >on your windows partition and isn't fragmented on your linux partition. > >Koundinya if his book generator is doing what i think it should be doing (reading in one PGN file after another, and writing the book to disk from time to time), then the read operation is negligible compared to the write of 16MB (which is what he says his book file size is). there is no way that reading games from HD is going to take any time at all - remember, GCP says he is only doing a few 10 games/s, and that kind of lousy performance cannot be due to harddisk reading, however fragmented it is. aloha martin >>The exact same program runs about 10x faster on Linux and barely >>accesses the disk. >> >>-- >>GCP
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