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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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