Scheduling with Hyperthreading

[Mike Sullivan <mike.sullivan@alltec.com>]

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
>  
>



-- 
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Mike Sullivan                           Director Performance Computing
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