RE: Hyperthreading: easiest userland method?

[Nakajima, Jun]

For licensing purposes, we recommend the number of the physical
packages, rather than the number of logical processors. We can provide a
tool (with source code) that counts the number of the physical packages
in the system.

Thanks,
Jun

> -----Original Message-----
> From: Dan Behman [mailto:dbehman@xxxxxxxxxx]
> Sent: Friday, September 12, 2003 7:41 AM
> To: linux-kernel@xxxxxxxxxxxxxxx
> Subject: Hyperthreading: easiest userland method?
> 
> Hi,
> 
> I have a need to programmatically determine whether or not
hyperthreading
> is enabled (and in use) for licensing reasons in my application.
> Currently, I know of two ways to do this:
> 
> 1) parse /proc/cpuinfo for "processor id"
> 2) port Intel's documented method (written for Windows) to directly
query
> the CPUs
> 
> Both methods have drawbacks - 1) relying on specific text that could
> change
> is a bad idea; 2) this doesn't take into account whether or not Linux
> and/or the BIOS is making use of the hyperthreading.
> 
> From scouring the archives and the net, it doesn't seem like there's
any
> API that currently exists, but perhaps I've missed something.
> /proc/cpuinfo gathers its information from somewhere - is there a way
in
> userland to bypass /proc/cpuinfo and directly get this data manually?
> 
> I'm interested in both 2.4 and 2.6 implementations and would like to
be
> personally CC'ed on any repsonses.
> 
> Thanks in advance!
> 
> Dan Behman.
> IBM Canada Ltd.
> 
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