[Beowulf] scheduler policy design
hahn at mcmaster.ca
Fri Apr 27 11:11:08 EDT 2007
> And I just spotted that KVM supports migration
> (http://kvm.qumranet.com/kvmwiki/Migration) and is integrated in the 2.6.21
I haven't quite figured out whether this is going to wind up acting
differently from, say, Xen on an un-kvm-enabled kernel. (assuming a
normal cluster environment, where no swapping is happening, and jobs
are either entirely compute-bound, or interested mainly in net IO.)
> This would allow the scheduler to schedule on the actual resources being used
> by an application and suspend and/or migrate a job whenever necessary.
as far as I can tell, the scheduler's logic wouldn't really change much:
instead of starting a bare job, it starts the job in its own container.
> Would'nt such an approach be far more superior (in terms of throughput) and
> much easier to use ?
the KVM is still a complete OS instance, afaikt. I don't really understand
whether this winds up being inefficient in memory - for instance, does the
kvm have its own pagecache, or all such things merely shared from the host
has anyone tried using UML to containerize jobs on a cluster? I recently
ran across a moderately old howto on using OpenSSI and UML.
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