Author: Christopher A. Morgan
Date: 11:54:49 12/31/02
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Bob, Thanks for the clarification. In case (2) does the second program actually have to be executing code, that is running, or just open, for the chess program that is running, to experience the speed up? Seems to me if two different programs are running they both slow down, although I understand under HT with two programs running they would both run faster than on a chip without HT. You also say, “For a non- threaded application, HT will not buy much...” Does this mean even with two non-threaded programs running on HT chip will not speed things up that much? By that I mean either program’s speed on the HT chip compared to its speed running alone on a comparable chip but without HT will be ~ the same. Thanks. Chris On December 31, 2002 at 10:54:54, Robert Hyatt wrote: >On December 31, 2002 at 03:08:54, Christopher A. Morgan wrote: > >> >>Bob, >> >>Are you saying a P4 chip with HT enabled should run 20-30% faster than a P4 chip >>with the same GHz that does not have HT, or anyway to use HT, at least in >>Crafty, and presumably in other chess engines as well? Thanks. >> > >Yes, assuming one of two things: > >(1) the program you run is threaded. IE the "deep" programs, or a program >like Crafty that understands parallel search; > >(2) you run two programs at the same time, so that there are two threads of >executable code ready to run at any instant... > >For either of the above, HT will speed things up significantly. For a non- >threaded application, HT will not buy much... > >> >> >>On December 30, 2002 at 22:13:43, Robert Hyatt wrote: >> >>>On December 30, 2002 at 19:39:23, Frank Koenig wrote: >>> >>>>Two questions. >>>> >>>>One) Will Intel's HT technology be able to help chess programs above and beyond >>>>just allowing one CPU to appear as two? >>>> >>>>Second) If you are running XP, will HT require XP Pro instead of XP Home to take >>>>advantage of it? >>>> >>>>Thanks, >>>> >>>>Frank >>> >>> >>>I can't answer the last question.... As to the first, you can expect a parallel >>>searcher to run 20-30% faster using two "virtual cpus" than using one real cpu. >>> >>>YMMV depending on the program however, as my numbers are numbers produced only >>>by Crafty on a 2.8ghz xeon...
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