Author: Robert Hyatt
Date: 20:50:42 08/31/00
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On August 31, 2000 at 22:29:26, pavel wrote: >On August 31, 2000 at 21:10:19, Robert Hyatt wrote: > >>On August 31, 2000 at 19:06:57, Roger Kyte wrote: >> >>>Hello, >>> >>>When a chess engine is running, is there much swapping occuring with the hard >>>drive ?? How much ?? Allot ?? >> >> >>Set up properly, there should be zero swapping. Compare the speed of accessing >>something in memory vs the speed of doing a seek/read from disk. 7 orders of >>magnitude different... > >wow !! are you speaking in martian language? (joke :) ) > >pls explaing, I didnt understand it. >and also what would coz a swapping ? >I did see a lot swapping by giving comet with 514mb of hash ;) > > >thanks > >pavel A good cpu today can go way over one billion instructions per second. A good disk drive can do one I/O every 10 milliseconds or so (100 reads per second, roughly). Divide one billion by 100, and take log10(result) and you get 7. :) If you specify more memory for a program than you actually have, then part of the memory will have to be kept on disk, and paged in as needed. That means you turn what would normally be a memory access (very fast) into a disk access (very slow).
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