Author: Pham Hong Nguyen
Date: 21:19:28 02/07/04
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On February 07, 2004 at 23:35:01, Robert Hyatt wrote: >On February 07, 2004 at 22:03:25, Pham Hong Nguyen wrote: > >>I have seen that in CCT6 Crafty used only 386 MB for hash table on a machine >>with 8 GB physical memory. > >Where did you see this? It isn't correct. I actually used 2x that much memory >as you can see in the cct6 log files on my ftp machine... Oops, that information I pick up from address: http://www.vrichey.de/cct6/ >It means that a huge memory (at least 7 GB) is almost >>redundant. I think in coming time, the situation will be worse: more physical >>memory could not be used for chess engines. I have been thinking some ways of >>using large size of memory and here may be one: load all 3-4 EGTBs into memory >>(near enough - need little more memory or some selections of EGTBs). Thus, >>instead of searching on HDD, we can search on memory. Some good programs (like >>Crafty) can develop some methods to look up EGTBs not only in main search but in >>qsearch. >> >>Just my two cents. :) >>What do you comment? >>+Pham > > >Linux does this already. If you have extra memory, it will cache up the >filesystem blocks quite readily to avoid doing additional I/O. That was one >reason I avoided using all of memory for hash. A good news :) But how about search in qsearch? Do you think the use of EGTBs in qsearch can help Crafty be stronger?
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