Author: Bo Persson
Date: 10:26:38 12/19/03
Go up one level in this thread
On December 19, 2003 at 02:05:44, Slater Wold wrote: >On December 19, 2003 at 01:37:29, Wayne Lowrance wrote: > >>On December 19, 2003 at 01:28:35, Slater Wold wrote: >> >>>On December 19, 2003 at 01:21:45, Jouni Uski wrote: >>> >>>>After installing more RAM to my Pentium 2,4 GHz I tested Fritz8 in some test >>>>suites with 128MB and 384MB hash (time limit was 10 minutes and positions quite >>>>hard = average solution times around 3-5 minutes): to my surprise >>>>average solution time was shorter with 128MB! Why? Absolutely no hard disk >>>>swapping with 512MB total RAM! >>>> >>>>Jouni >>> >>>Windows is kinda crappy here... >>> >>>I watched Bob go from 384MB to 4096MB hash the other nite, and his NPS did _NOT_ >>>slow down. Not even a FRACTION of a percent. Of course, he was running SuSe >>>(Linux). >>> >>>In Windows, that isn't going to happen. Every single time you edge your hash >>>up, you'll probably see a slowing down of NPS. Why? Swapping. Windows does >>>*too* much of it. >>> >>>Turn your swap file off, and see what happens. ;) >> >>please explain this swapping. >>Thank you > >http://aumha.org/win5/a/xpvm.php > > >Do this test (on 2K & XP). > >Close everything possible. >Run Task Manager, and look at your PF Usage (page file). >Open Crafty, Fritz, whatever, and use 50% of your total physical memory. >Now look at your PF usage. That doesn't tell much. Windows is known to "pre-swap" on its spare time, to have pages potentially available if and when needed. What is interesting is not the size of the swapped area, but if it is used during game play. Bo Persson
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