topic Re: Hyperthreading support on Linux in Operating System - Linux

Hyperthreading support on Linux

Alpa Shah — Fri, 06 Apr 2007 08:40:26 GMT

Is there any command to know if hyperthreading is supported or not on a specific OS?
Also, if it is supported then how can I enble/disable it?

Thanks in advance

Re: Hyperthreading support on Linux

Steven E. Protter — Fri, 06 Apr 2007 09:14:10 GMT

Shalom,

The kernel supports hyperthreading on most modern distributions of Linux. The way to test it is with a simple test application.

You may see some evidence of the existance of support in the boot sequence for /var/log/messages.

SEP

Re: Hyperthreading support on Linux

Hein van den Heuvel — Fri, 06 Apr 2007 13:55:44 GMT

See prior discussion in:

http://forums1.itrc.hp.com/service/forums/qu
estionanswer.do?threadId=246357

Summary:

#grep flags /proc/cpuinfo

If this gives " ht " as returned flag, then the CPU is ht CAPABLE, but it may have been disabled in bios.

grep -E "processor|physical id" /proc/cpuinfo

Study the numbers...

Hein.