Re: [RFC] KVM-Autotest: basic parallel test execution

[Avi Kivity <avi@redhat.com>]

Ryan Harper wrote:
> I took a slightly different approach.  The kvm_tests.cfg file already
> provides a dependency relationship between different tests.  I modified
> the main loop in the control file to walk the entire list of jobs and
> pull out any jobs that don't have any dependencies (ie, install tests).
> And then run N jobs in parallel from that list until it is exhausted;
> then store the results.  Then loop the over the remaining list of jobs
> again finding the jobs that can be run.
>
> On a larger multi core system, one might set the number of parallel jobs
> equal to the number of cores.
>
> I think this works well with using autoserv to farm out different
> kvm_tests.cfg to different machines.
>   

This is my preference as well, though I think scheduling needs to be 
cleverer.  Each test should specify how much memory and how many cores 
(the -m and -smp parameters) it needs, and the scheduler needs to make 
sure we don't over commit the host for tests.

This ensures the best utilization while not interfering with test timing.

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