Author: Robert Hyatt
Date: 14:37:21 10/15/03
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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.
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