Author: Robert Hyatt
Date: 19:32:52 12/30/02
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On December 30, 2002 at 20:29:11, Vincent Diepeveen 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 > >For dual machines you need even newer releases of OSes to still get >released. > >However you can profit from it in a very limited way. It's a speedup of >18% for DIEP at the latest P4 (3.06Ghz), at older P4s the profit is less >(like P4 Xeon 2.8Ghz) and even older P4s the profit is zero or negative. Any chance you will _ever_ "test before talking"? The 2.8 xeon has the _same_ SMT core as the PIV/3.06. The _same_ means "the same", not "something that is not as good as." That is simply a crock statement that is nonsense. From _testing_ on my part... > >So it's progressing but the P4 is a processor not really mature enough: >too little trace cache and too little datacache: just 1024 quadwords; So? 12K micro-ops. 8kb data. Core-speed L2 cache with 512KB unified cache. Seems to work quite well in all the testing I have done. >compare with the 64KB L1 data cache of a K7 which is i guess 16384 >doublewords. what is with all the quadword/doubleword nonsense? I think _most_ here can figure out what 64 KB turns into in your favorite data size... > >It's already having a very small L1 cache and trace cache compared to >the L1 of the K7 (128KB) and now you have to divide that by 2 again. > >So that isn't very positive yet. > >Let's wait for the future if we can see bigger profits. In which case it >gets very interesting of course.
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