Messages in this thread | | | Date | Tue, 25 Feb 2003 02:43:52 -0500 | From | Mike Sullivan <> | Subject | Scheduling with Hyperthreading |
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Sorry, should have been more specific. I am referring to the scheduler. I have noticed that if I run two compute intensive jobs on a Dual Xeon, the processes run on separate physical cpus and can spend a significant amount of time with both on a single cpu. I have seen some patches that try to improve on this and was wondering if they have made it into the production kernel stream. I ran tests on a 2.4.20 kernel and it had the same problem as a 2.4.18 kernel.
Thanks
Mike
William Lee Irwin III wrote:
>On Mon, 24 Feb 2003, Mike Sullivan wrote: > > >>>What kernel versions will attempt to distribute jobs across physical CPUs on >>>Xeon SMP configurations. >>> >>> > >On Mon, Feb 24, 2003 at 10:45:18PM -0700, James Bourne wrote: > > >>From what I've heard, Arjans' user space daemon might be the way >>things are going, it's at http://people.redhat.com/arjanv/irqbalance/ . >>The other way that you might try is the irq load balance patch that Ingo >>produced. There is a patch that is from 2.4.20 at >>http://www.hardrock.org/kernel/2.4.20/ and it is what I'm using at work on >>our current Xeon systems (until I have the chance to test the user space >>daemon at least). >> >> > >I think he's referring to the cpu scheduler, not interrupt load >balancing. mingo might have some insight into current patches for >this and current results thereof. I don't really participate in >the scheduler aside from very occasional bugfixing. > > >-- wli > >
-- ---------------------------------------------------------------------- Mike Sullivan Director Performance Computing @lliance Technologies, Voice: (416) 385-3255, 18 Wynford Dr, Suite 407 Fax: (416) 385-1774 Toronto, ON, Canada, M3C-3S2 Toll Free:1-877-216-3199 http://www.alltec.com
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