Author: Slater Wold
Date: 19:27:46 05/27/04
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On May 27, 2004 at 20:16:25, Bernardo Wesler wrote: >I wonder why some people say that HT is useless, and some other say it is good? >But the main point at least for me, is to know what is HT really? Which are the >pros and no-pros? Further details, welcome!! >Thx in advance >Dr Wesler I had a P4 (with HTing) and it was a neat feature for "free". It's tricky though. It can help, and it can hinder. It can help in that 2 programs (different programs, and not chess programs) will run better than on a 'standard' CPU. When I say better, I mean if they are both using CPU time, they both will run faster than a 'standard' CPU. It can hinder a chess program, because a lot of people seem to think you can run ponder=on matches; you cannot. Also, most SMP programs will get a 20%ish speedup, but Crafty is now NUMA, and it can actually deteriate performace. So then you'd want to set CPUS=1. Well, then you're going to split it between the physical and logical CPU, and it's going to run like crap. So then you have to set your affnity to a single CPU, and remember to do that everytime. Told you it's tricky.
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