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Subject: Re: Compressing disk and chess programs perfomance

Author: Jeremiah Penery

Date: 00:30:03 01/20/00

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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



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