Cluster with 8 workers runs only one job at a time
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I am using a local cluster (parcluster) to run 6 jobs. When I examine my cluster, I see that it reports 8 workers. Since I'm submitting the 6 jobs simulataneously, I would expect that all six would start running right away. Instead, the jobs are only executed one at a time with the others remaining in a 'queued' state. Is there a way to run more than one job at a time, or (best case) run all jobs simultaneously?
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Edric Ellis
2014-6-18
How are you submitting these jobs? I just tried this using the BATCH command, and saw this:
>> c = parcluster('local');
>> for idx = 1:6, batch(c, 'pause(10)'); end
>> c.Jobs
ans =
6x1 Job array:
ID Type State FinishTime Username Tasks
------------------------------------------------------------------
1 1 independent running eellis 1
2 2 independent running eellis 1
3 3 independent running eellis 1
4 4 independent running eellis 1
5 5 independent running eellis 1
6 6 independent running eellis 1
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Sean de Wolski
2014-6-18
The tasks are not running serially as you expect but are running in parallel and are thus using all of the resources available. This is why the next job has to wait until the previous has finished running all of its tasks.
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