Re: Linux scheduler capabilities for batch jobs.

[Avi Kivity <avi@redhat.com>]

Rik van Riel wrote:
> J Louis wrote:
>
>> If it was possible to tell
>> the scheduler that it was OK not to be fair when scheduling these
>> processes, I think the total runtime could be reduced if it put some
>> of the processes to sleep while others completed.  Is there a way to
>> tell the scheduler it is allowed to do this?  Should there be?
>
> There is no way to do this currently, but I suspect that it
> would not be too difficult to add.
>
> Of course, if you have two tasks that are each a little larger
> than memory, your idea could lead to one of the processes being
> starved forever.  This is probably not acceptable :)
>
> In fact, one single batch process that is swapping could trigger
> the algorithm you described, halting itself.  Your idea would
> need very carefuly implementation to avoid these kinds of issues,
> but I believe it could definately be done.

Some king of interaction between the swap token and the scheduler, 
perhaps, for SCHED_BATCH processes.


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