Hi :)

On Sat, Feb 5, 2011 at 00:11, Sri Ram Vemulpali [off-list ref] wrote:

Hi all,

? ?I have doubt regarding how the thread affinity (to processor) is
defined in a process (task). If there is only single thread in a
process, then when process calls itself on binding to a core, will let
run on that core forever. But, what if there are multiple threads, in
a process (task). If the main thread calls set affinity to a core, is
it going to get inherited to all other threads, or just the calling
thread in a task. What happens when forked a process with threads that
has affinity to a core.

AFAIK, forked process (or thread) initially inherit the affinity
property of the parent process. As for thread, I think kernel will
make as long as possible (or maybe forbid) the thread to have
different affinity. The reason could be to avoid too many cache
invalidation / ping pong between cores.

-- 
regards,

Mulyadi Santosa
Freelance Linux trainer and consultant

blog: the-hydra.blogspot.com
training: mulyaditraining.blogspot.com