Author: Dave Gomboc
Date: 01:39:38 01/20/00
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On January 20, 2000 at 03:30:03, Jeremiah Penery wrote: >On January 20, 2000 at 03:06:16, Dave Gomboc wrote: > >>[Repost, because apparently the link got trashed somehow.] >> >>Subject: Re: Compressing disk and chess programs perfomance >>From: Dave Gomboc >>E-mail: dave@cs.ualberta.ca >>Message Number: 90155 >>Date: January 19, 2000 at 23:21:54 >> In Reply to: Compressing disk and chess programs perfomance >> Message ID: 90145 >> Posted by: Fernando Villegas >> At: ferdinan@cmet.net >> On: January 19, 2000 at 22:19:45 >> >>On January 19, 2000 at 22:19:45, Fernando Villegas wrote: >> >>>Hi: >>>I am somewhat scarce of hard diks room and so tempted to compress. Anyone has >>>experience about the effect in chess programs perfomance? >>>fernando >> >>The newest tablebases are already compressed, and attempting to compress them >>further won't really get you anywhere. If you use tablebases, you should leave >>them on an uncompressed area. Other than that, a chess-playing program >>shouldn't really be affected (reading in moves from an opening book should be >>fast enough that it is irrelevant, unless your program is playing 200 moves per >>minute on a chess server or something). Obviously, the performance of a chess >>database program running on a compressed disk is a whole different story >>(potentially an ugly one!) > >It may depend on the specific disk-compression you use. > >I can say that for native NTFS (WinNT) disk compression, there was no noticable >impact on performance for any program. I had things like TBs (Edwards) >compressed, and performance wasn't slowed at all. Before Nalimov compression, I >had those compressed that way also, with no noticable performance hit. >I think NTFS compression is a bit conservative, though, and if you use something >else, performance might be a bit less. YMMV. :) > >Jeremiah Probably NTFS was smart enough to detect that it couldn't recompress the data, and consequently left the actual data alone. Some compression implementations are not so clever. Dave
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