Re: find the node that a cpu belongs to

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On Tue, Mar 17, 2009 at 11:45:22AM +0100, Andi Kleen wrote:
> On Tue, Mar 17, 2009 at 03:09:10AM +0200, Kornilios Kourtis wrote:
> > Hi,
> > 
> > I was wondering if you would be interested in adding a libnuma function
> > for determing the node that a cpu belongs to.
> 
> Concrete use case please. Why would you want to do that in a program?

My specific case is quite simple: I have a program that creates a number
of threads that are bound to run in specific cpus. I want to pre-allocate
memory in the node of the cpu that the thread will run before the threads
are created using numa_alloc_onnode().

Obviously, there isn't a hard requirement to include such a function in
libnuma, since it could be implemented using existing functions, or make
the allocations after the threads are spawned using numa_alloc_local().

On the other hand I'm guessing that it could be useful to other cases as
well.

cheers,
-- 
Kornilios Kourtis
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