Setting CPU affinity to process( Freebsd smp kernel)

[Daniel Eischen]

On Fri, 23 Feb 2007, Robert Watson wrote:

> On Wed, 21 Feb 2007, Kunze, Aaron wrote:
>
>> Does anyone know if this will change any time soon?  For example, is anyone 
>> working on exposing affinity to user-space applications via extensions of 
>> the pthreads interface?
>> 
>> Sorry to reply to such an old thread...
>
> I know of no work along these lines currently, but it's something a lot of 
> people would like to see happen.  There's a potential for conflict between 
> the kernel's use of pinning and binding for kernel synchronization and the 
> user space affinity model, which will be entirely avoided if done right. :-) 
> For now, it's quite easy to add a sysctl/syscall that allows user space to 
> send the kernel scheduler's notion of thread binding, but this isn't really 
> the right approach.  As I understand it, some systems support setting CPU 
> affinity for a thread as a set of CPUs it is willing to run on ?

I know Solaris has processor_bind(2) and pset_bind(2):

   http://docs.sun.com/app/docs/doc/816-5167/6mbb2jaeu?a=expand#P

-- 
DE