Re: Linux compatible setaffinity.

On Thu, 21 Feb 2008, David Xu wrote:

Robert Watson wrote:

On Wed, 20 Feb 2008, Jeff Roberson wrote:

So perhaps this means a slightly more complex API, but not much more complex. How about:

int cpuaffinity_get(scope, id, length, mask)
int cpuaffinity_getmax(scope, id, length, mask)
int cpuaffinity_set(scope, id, length, mask)
int cpuaffinity_setmax(scope, id, length, mask)


Are these features only for jail or something else which don't care CPU
L2 cache sharing between cores ? since program still can not figure out
L2 sharing information, no way to optimize its thread's cpu arrangement.

These are all for binding to specific cpu sets. Potentially with some support for creating something like solaris psets. This is when you have some static information about what processors to use.

I think a cache aware solution will be the next process. I have a patch which allows the kernel scheduler to understand the cache hierarchies in the system. This information could be exported to userland if that would be useful.


Regards,
David Xu

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