Author: Aaron Gordon
Date: 09:50:32 05/18/03
Go up one level in this thread
On May 18, 2003 at 11:53:57, Robert Hyatt wrote: >On May 17, 2003 at 20:50:52, Aaron Gordon wrote: > >>On May 17, 2003 at 15:21:53, Jeremiah Penery wrote: >> >>>On May 16, 2003 at 07:04:02, Aaron Gordon wrote: >>> >>>>On May 15, 2003 at 21:35:35, Nolan Denson wrote: >>>> >>>>>http://www6.tomshardware.com/cpu/20030513/index.html >>>> >>>>Look at the seti@home benchmarks, tell me nothing looks screwy there... >>>>P4-3GHz w/ the same L2 & bus/memory speed as the P4-2.8 yet it 'magically' does >>>>it in half the time? Riiiggghhhtt.. :) >>> >>>That would probably be because of Hyperthreading. >> >>Seti doesn't support multiple threads, and hyperthreading won't increase >>performance 100%, especially for Seti@home. > > >For the right instruction mix it will double cpu speed. Check out Eugene's >comments about running the tablebase compression utility (two copies) on a >single SMT-enabled CPU. This application apparently has just the right >memory reference pattern and two copies will run in the same time that one >will run... > >That's the only example I have heard of, but I haven't done a lot of checking >to see if there are others... What I was saying was that I've done seti for years now, and have done the testing and know the results tom posted are impossible. Also, other than what you & Eugene have stated I haven't seen HT help out more than 20% and in most cases it hurts performance, which is also what AMD came up with. http://www.theinquirer.net/?article=9475
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