Re: [Condor-users] Feature Request: ability to set processoraffinity for a slot

[Ian Chesal <ICHESAL@xxxxxxxxxx>]

> 2009/1/8 Ian Chesal <ICHESAL@xxxxxxxxxx>:
> [snip]
>> I'd like to be able to tell Condor, preferrably on a per-job basis
but
>> even on a per-slot basis this would be great, to spawn the job
command
>> with a processor affinity bit mask so the command and any child
threads
>> from it are locked to a particular processor on a machine (or a
>> particular set of processors).
>>
>> Right now I'm handling this by wrapping my *real* command in a higher
>> level command that Condor calls and the wrapper calls my real command
>> with a custom executable I've written that sets the processor
affinity
>> bit mask for the real command.
> [snip]
>
> I'm currently also investigating a similar problem to this. I've got a
> USER_JOB_WRAPPER script that sets processor affinity based on the
> value of the environment variable _CONDOR_SLOT. What I've not yet
> managed to figure out is a way to make this integrate with the
> RequiresWholeMachine mechanism from http://nmi.cs.wisc.edu/node/1482.
>
> Basically putting
> +RequiresWholeMachine = true
> in a job submission causes the job to only run on slot1 and other
> slots on the machine to be set to owner. Which brings me to my real
> question: How can I cause the +RequiresWholeMachine in the job
> submission to set an environment variable for the USER_JOB_WRAPPER
> script?
>
> I slightly optimistically tried using:
> STARTER_JOB_ENVIRONMENT =
> WHOLE_MACHINE_JOB=$$([$(MY.RequiresWholeMachine)])
> Which didn't work, as I suspected.
>
> Any ideas?

You can tell condor_submit to put this in the environment of the job as
part of the submission ticket:

environment = WHOLE_MACHINE_JOB=$(RequiresWholeMachine)

If that doesn't work you can tell the Startd to advertise
RequiresWholeMachine as part of it's ClassAd when I a job starts by
adding the following to your condor_config file on the machine:

STARTD_JOB_EXPRS = $(STARTD_JOB_EXPRS), RequiresWholeMachine

And then putting the following in your submit ticket:

environment = WHOLE_MACHINE_JOB=$$(RequiresWholeMachine)

One of those will work. I think. :)

- Ian

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