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Subject: Hyperthreading - with half speed?

Author: Gabor Szots

Date: 02:44:34 11/01/05

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.

Gábor

• Re: Hyperthreading - with half speed? Robert Hyatt 06:44:34 11/01/05
• Re: Hyperthreading - with half speed? K. Burcham 04:03:00 11/01/05
  • Re: Hyperthreading - with half speed? Gabor Szots 05:47:15 11/01/05
    • Re: Hyperthreading - with half speed? Gabor Szots 23:44:08 11/01/05
      • Re: Hyperthreading - with half speed? Gregory Owett 01:30:41 11/02/05
        • Thanks for the hint. (NT) Gabor Szots 03:34:11 11/02/05
  • Re: Hyperthreading - with half speed? Gabor Szots 04:10:22 11/01/05
• Re: Hyperthreading - with half speed? Gian-Carlo Pascutto 02:58:14 11/01/05
  • Re: Hyperthreading - with half speed? Gabor Szots 03:17:59 11/01/05
    • Thank you, guys. Gabor Szots 04:11:29 11/01/05
    • Re: Hyperthreading - with half speed? Gian-Carlo Pascutto 03:27:09 11/01/05
    • Re: Hyperthreading - with half speed? Martin Baumung 03:24:12 11/01/05

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