Author: Will Singleton
Date: 15:15:04 10/15/03
Go up one level in this thread
On October 15, 2003 at 17:37:21, Robert Hyatt wrote: >On October 15, 2003 at 16:35:39, Will Singleton wrote: > >>On a P4 computer with hyperthreading, my task manager shows the system idle at >>50% and my chess program at 50% cpu. Is this normal? Is it possible to toggle >>hyperthreading? >> >>As long as I'm off-topic, does the Intel 64-bit compiler produce code for the >>Athlon 64? The specs seem to be all geared toward the Itanium. >> >>Will > > >You can usually turn it off in the bios, although it is rarely called >"hyperthreading". On my Dell Poweredge, It is called "logical cpu" and it >is on or off. If you run linux, you can tell the kernel to not use it when >you boot, or you can turn it off in the bios prior to booting. > >If you only run one thread, there is no reason to turn it off. You are >getting 100% of one real cpu. Interrupts will bounce off the other one >and take some resources, but without the other cpu your process gets >dislodged to handle the interrupts so it is a wash. Thanks, Bob. You imply there's a reason to turn it off if running multiple threads. Do you mean, for example, a chess program with a separate thread for i/o would lose performance? Have any info on the compiler question? Will
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.