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    SubjectScheduling with Hyperthreading


    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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