Locking a pthread to a CPU

[mcg...@bbn.com]

How does one lock a pthread to one CPU in a dual CPU machine. Is there
some notion of a CPU scheduler whereas you can lock a process to CPU0
vs. CPU1?

The environment is a dual Intel P4 running RedHat 7.3 Kernel 2.4.18-3.
Where do I find the tools or apps that would allow me to do this?

Thank you for any help or suggestions.

Michael
mailto:mcg...@bbn.com

[Nils O. Selåsdal]

You currently can't do that. With the upcoming 2.6 kernel, atleast
processes can be bound to a cpu probably threads also.

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Nils Olav Selåsdal
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[Kasper Dupont]

"mcg...@bbn.com" wrote:
>
> How does one lock a pthread to one CPU in a dual CPU machine. Is there
> some notion of a CPU scheduler whereas you can lock a process to CPU0
> vs. CPU1?
>
> The environment is a dual Intel P4 running RedHat 7.3 Kernel 2.4.18-3.
> Where do I find the tools or apps that would allow me to do this?

It should be possible to do it with a kernel module, but I haven't
had oportunity to try it. In 2.6 there will be an ordinary system
call to do it, so you can probably expect the feature to be in
RedHat 9.0, but they may of course backport the syscall to 2.4
kernels. Also read this:

http://www.daimi.au.dk/~kasperd/comp.os.linux.development.faq.html#affinity

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