Author: Robert Hyatt
Date: 08:26:31 12/29/03
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On December 29, 2003 at 10:48:15, Peter Berger wrote: >Hi, > >this has probably been discussed before - I wonder if it is possible to use >these engines in dual mode on a P4HT 3.06GHz computer and if the answer is yes, >what kind of speedup you can expect. > >TIA, >Peter Crafty used to get about 20-30% faster (raw NPS) by enabling SMT and then using mt=2. The last time I tested it, this had dropped, due to some changes we had made for NUMA that actually made it faster on Intel as well, and by making it faster (read fewer cache misses) it seems that SMT has dropped off a bit, to the 10-20% range. This turns into an actual time-to-ply speedup of 7-14% faster. Of course, you should measure it on your hardware with the current version of Crafty to see what recent changes have done. I don't test this very often.
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