From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dhaval Giani Subject: Re: Hang with fair cgroup scheduler (reproducer is attached.) Date: Fri, 14 Dec 2007 19:45:28 +0530 Message-ID: <20071214141528.GA6161@linux.vnet.ibm.com> References: <20071214161834.034e6efe.kamezawa.hiroyu@jp.fujitsu.com> <20071214171759.59f7ba57.kamezawa.hiroyu@jp.fujitsu.com> <20071214094909.GG11266@elte.hu> <20071214195837.0d3511db.kamezawa.hiroyu@jp.fujitsu.com> Reply-To: Dhaval Giani Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Content-Disposition: inline In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org Errors-To: containers-bounces-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org To: Dmitry Adamushko Cc: Peter Zijlstra , vatsa-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, "containers-qjLDD68F18O7TbgM5vRIOg@public.gmane.org" , Ingo Molnar , Andrew Morton List-Id: containers.vger.kernel.org On Fri, Dec 14, 2007 at 01:47:13PM +0100, Dmitry Adamushko wrote: > On 14/12/2007, KAMEZAWA Hiroyuki 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@rhel51GA testpro]#./batech-test.sh > > no hang. > > > > [root@rhel51GA testpro]#taskset 0f ./batech-test.sh > > no hang > > > > [root@rhel51GA testpro]#taskset 03 ./batech-test.sh > > hang. > > have you tried : > > [root@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