Hang with fair cgroup scheduler (reproducer is attached.)

[Dhaval Giani]

On Fri, Dec 14, 2007 at 01:47:13PM +0100, Dmitry Adamushko wrote:
> On 14/12/2007, KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com> wrote:
> > Here is much easier test.
> > (I'm sorry I'll be absent tomorrow.)
> >
> > the number of cpus is 8. ia64/NUMA.
> >
> > The hang occurs when the number of tasks is not smaller than available cpus.
> > Can be a hint ?
> >
> > [ ... ]
> >
> > [root at rhel51GA testpro]#./batech-test.sh
> > no hang.
> >
> > [root at rhel51GA testpro]#taskset 0f ./batech-test.sh
> > no hang
> >
> > [root at rhel51GA testpro]#taskset 03 ./batech-test.sh
> > hang.
> 
> have you tried :
> 
> [root at rhel51GA testpro]#taskset 01 ./batech-test.sh
> 
> hang?
> 
> just to be sure SMP does matter here (most likely yes, I guess).
> 

NUMA? I am not able to reproduce it here locally on an x86 8 CPU box.


-- 
regards,
Dhaval