[Swift-devel] Functionality request: best effort execution

[Tiberiu Stef-Praun]

I am trying to control for runaway tasks, not just to simulate them.
The scenario is for tasks which are waiting in the queue, in which
case the wrapper script will not be able to implement the timeout
functionality (because the tasks are not executed yet).
For this reason, I wanted Swift to be aware of time-limited jobs, and
give up on them without an error message (by defaulting to a "dummy"
output).

I am wondering if I can use globus::maxwalltime as a timeout mechanism ?
My current solution is to have a task run locally and the other one
remotely, and to use the local tasks' timeout as a barrier to
generating the dummy output or to validating the remote result as the
proper output.

I know I am pushing the limits here, that's what I pretty much do all
the time with Swift.

Tibi

On Mon, Jul 13, 2009 at 7:05 PM, Michael Wilde<wilde at mcs.anl.gov> wrote:
>
>
> On 7/13/09 6:59 PM, Mihael Hategan wrote:
>>
>> That somewhat crosses over the fence of
>> time-agnostic/sequence-independent nature that swift is in.
>>
>> Can you implement this as part of your application (i.e. a wrapper
>> script)?
>
> I agree - I think the logic below could be done in a shell script fairly
> simply, Tibi.
>
> - Mike
>
>>
>> On Mon, 2009-07-13 at 18:21 -0500, Tiberiu Stef-Praun wrote:
>>>
>>> Hi Swift team
>>>
>>> I am curious if there is a way of coding up (or having in the near
>>> future) the following functionality:
>>>
>>> (file output) applicationWrapper(file input){
>>>   appOutput = runAtomicApplication(input);
>>>   dummyOutput = runTimer ();
>>>
>>>   if (Atomic Application Finished First){
>>>      output = appOutput;
>>>  } else {
>>>     output = dummyOutput;
>>>  }
>>> }
>>>
>>>
>>> I am not sure how to tell swift to stop waiting for the second task,
>>> as soon as the first one has completed successfully.
>>>
>>> Thank you
>>> Tibi
>>>
>>
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>



-- 
Tiberiu (Tibi) Stef-Praun, PhD
Computational Sciences Researcher
Computation Institute
5640 S. Ellis Ave, #405
University of Chicago
http://www-unix.mcs.anl.gov/~tiberius/