Re: [Condor-users] suspending jobs - resourse efficiency questions

[Dan Bradley <dan@xxxxxxxxxxxx>]

There is another useful example in the How-to collection on this topic:

http://nmi.cs.wisc.edu/node/1480

I have used something like that policy on dual cpu machines.  Extending 
it to machines with more slots is not difficult.

--Dan

Gary Orser wrote:
> This suspend policy is what I would like to implement.
>
> Anybody done this on blades with dual quad cpu's?
>
> Cheers, Gary
> ------------------------------------------------------
> Gary Orser
> Department of Microbiology
> Montana State University
> 1 Lewis Hall, Bozeman MT, 59717
>
> On Mon, 30 Jun 2008, Dan Bradley wrote:
>
>   
> > Burak Han Alver wrote:
> >
> >     
> > > Hi,
> > >
> > > I have questions about suspending condor jobs in favor of other condor
> > > jobs with configuration similar to the way described in 3.5.10.6
> > > http://www.cs.wisc.edu/condor/manual/v6.8/3_5Startd_Policy.html#SECTION004510600000000000000
> > >
> > > Do I understand correctly that:
> > > 1. The suspended job still uses memory and the running job will need to
> > > use less memory in principle?
> > >
> > >
> > >       
> > The suspended job uses virtual memory, but not necessarily physical
> > RAM.  If the computer is configured to provide extra virtual memory on a
> > disk (aka swap space), then the operating system will likely move the
> > suspended job to disk if there is demand for its space in RAM.
> >
> >     
> > > 2. The suspended job will not use CPU and the running job will be able
> > > to use all of the CPU even though two virtual machines are defined?
> > >
> > >
> > >       
> > Yes.
> >
> >     
> > > 3. Even though the whole CPU is available, the ClassAd for the VM will
> > > advertise half the computing power?
> > >
> > >
> > >       
> > Condor will advertise twice as much computing power as actually exists
> > (because in this example policy, NUM_CPUS is set twice the actualy
> > number of CPUs).  However, the suspension policy ensures that only one
> > job runs on the real CPU at a time.
> >
> > --Dan
> >
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