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 ?
Robert N M Watson
Computer Laboratory
University of Cambridge
Aaron
---------------
On Monday 20 November 2006 06:24, Ashok TM wrote:
Hello,
Is there a way to set a process's CPU affinity with freebsd smp
kernel.
By doing so a process is bound to and will only run on the processor
(where
the affinity was set ) even though the other processors are free.
(similar
to sched_setaffinity available on Linux kernel) .
Does freebsd smp scheduler supports setting affinity?
Yes, but currently only in the kernel.
--
John Baldwin
--------------------------
Aaron Kunze
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