Author: Keith Evans
Date: 20:47:23 04/11/03
Go up one level in this thread
On April 11, 2003 at 23:26:35, Robert Hyatt wrote: >On April 11, 2003 at 16:53:59, Tom Kerrigan wrote: > >>On April 11, 2003 at 10:58:29, Robert Hyatt wrote: >> >>>I have explained "why not" before. >>> >>>My configuration is a dual 2.8. I can't remove a CPU because I don't have a >>>terminator to >>>stick in the socket. So I am stuck with two. I can enable or disable SMT when >>>I boot the >>>machine. >>> >>>now tell me how to run the test. Two copies might run on one physical cpu >>>(using two >>>logical cpus). Or they might run on two physical cpus. I have no control over >>>that. And >>>they will bounce around between processors as they run. >>> >>>Your turn. Tell me how to run a valid test and I'll let 'er rip. >> >>Actually a friend of mine has access to a P4/3.06 and I ran the test myself. >>Took less than 5 minutes. >> >>I opened two instances of my program and had them search the same position >>simultaneously and compared their NPS after ~10 seconds. I did this three times. >>Task Manager showed that both logical processors were pegged. The NPS ratios >>were: >> >>51%-49% >>49%-51% >>48%-52% >> >>It's pretty darn obvious that HT does not favor one logical processor more than >>another. (Contrary to Hyatt and Vincent's assertions.) >> >>You should thank me, Bob. Your hands must be really tired from all that waving. >> >>-Tom > > >First, I didn't say it did or it didn't. I said that tests suggest that there >can be imbalances. > >Second, you found a result for _one_ test. What about one that does a lot of >memory reads? Memory writes? Mixture? > >There are _lots_ of tests to do. Also I believe that he said that HT didn't improve his program's performance. So you may see different behavior for Crafty which is helped by HT.
This page took 0.02 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.