Author: Gabor Szots
Date: 03:17:59 11/01/05
Go up one level in this thread
On November 01, 2005 at 05:58:14, Gian-Carlo Pascutto wrote: >On November 01, 2005 at 05:44:34, Gabor Szots wrote: > >>I just got a new machine with P4 3GHz CPU. Analyzing positons with chess >>programs I looked at task manager and was surprised by seeing that only 50% CPU >>was assigned to the chess program thread while the other 50% was idle. >>I tried the same with Deep Sjeng with 2 processor setting and I saw 2 50% CPU >>threads while the system was idle 0%. Ok, however the Nps was the same as with >>only 1 processor, and test solution times were also the same. >>This all was under WinXP SP2. >> >>How can I exploit full CPU power? Any explanation would be welcome. > >A system with hyperthreading really only has a single processor, it just >pretends there are two. At best you will get a few percent speedup. > >A real dual core processor will give >70-80% speedup. > >-- >GCP The problem is that the system behaves as though the CPU ran at only 1.5 Ghz instead of 3. If there is only 1 thread, why do the chess programs not use 'both' CPU's? I think both halves of the CPU should process that single thread simultaneously, thereby adding their 1.5 Ghz speeds together. I have a feeling that I don't understand this at all. I don't want a speedup, I would like to avoid a slowdown.
This page took 0 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.