Author: m.d.hurd
Date: 00:05:19 11/29/02
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On November 29, 2002 at 02:05:16, James T. Walker wrote: >On November 28, 2002 at 19:27:19, Jeremiah Penery wrote: > >>On November 28, 2002 at 17:11:08, James T. Walker wrote: >> >>>On November 28, 2002 at 16:54:25, mike schoonover wrote: >>> >>>>could it be that the master drive determines the access speed? >>>>or,the system gives the master priority,hoging resources? >>>>regards >>>>mike >>> >>>Hello Mike, >>>The only problem with that theory is the computer where the TB's are on the >>>"Master" drive is the slow one. The fastest one uses the 8G/5400rpm as drive C >>>(Master) and the 40G/7200rpm as drive D (Slave). The chess programs are on the >>>"C" drive in both cases. >>>Jim >> >>I would guess that the reason for the slowdown is because the virtual memory >>(pagefile) is on the same drive as the tablebases. So, when it caches >>information, it's copying on the same disk, while also trying to access other >>tablebases. On the other machine, it copies to a different disk, which will be >>much faster. >> >>Other things that can affect the access speed of tablebases are disk >>fragmentation and the physical position of the tablebase files on the disk. If >>the files are heavily fragmented on one system, and are contiguous on the other, >>the fragmented ones should be quite a bit slower. Files near the beginning of >>the disk have faster access times and faster transfer rates than files near the >>end of the disk, as well. > >Thanks for trying to help. I did de-frag the drive on the slow computer and it >seemed to help some. It now starts out at almost the same speed but slowly lags >behind. For instance, both computers will reach 14 ply in 15 seconds on one >computer and 16 seconds on the other. But when getting to say 16 ply at 2:15 on >one computer it takes like 3:10 on the other. Also as you might guess, the NPS >on the computers gets further apart with time. >Jim Hello Jim One thing worth checking is the EGTB cache size, which is set in Options. Mine was set at 1 mb. It might be worth experimenting with different sizes to see what difference each size increase makes. The help file says to use a value of 1 to 8 mbs. However I seem to recall someone mentioned 16 mb was a good size to use. I suppose the bigger the cache, up to the optimum figure, the less disk access. Regards Mike.
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