MATLAB: Flag whether or not a program has been called by createTask

Parallel Computing Toolbox

I run certain jobs either as standalone jobs, or in parallel, for example called by createTask. Is there some way to distinguish between these cases? obviously I could use brute force, use dbstack and related tools and check if the calling line had the word createTask in it, but I'd much prefer to do something more general/elegant. Since one can interact with programs in the former case, but not the latter, there must be something matlab knows that I can tap into…

Thanks very much for any help!

Leo

Best Answer

One simple way is to check the return of getCurrentTask. This will always return empty in a desktop MATLAB session, and a parallel.Task object when running on a worker.

Related Solutions

MATLAB: Am I inside a parfor

You can check to see if you are currently running on a worker (aka running in parallel) by using the following commands.

     parfor ii = 1:2
        job = getCurrentJob;
        if isempty(job)
            display('not running in parallel')
        else
            display('running in parallel')
        end
     end

If you are not running in parallel, the function should return an empty. If you are running in parallel, it will return a job object corresponding to the job you are inside.

MATLAB: Do Tasks stay in the ‘queued’ state while their corresponding Job is in the ‘finished’ state when using the Parallel Computing Toolbox 4.1 (R2009a)

In such cases, there is a possibility that the MATLAB code submitted in the Task did not execute and hence the task is still in a 'queued' state.

Execute the following command to view the job's file and check whether MATLAB failed to start up:

getDebugLog(sched,tasks(1))

Best Answer

Related Solutions

MATLAB: Am I inside a parfor

MATLAB: Do Tasks stay in the ‘queued’ state while their corresponding Job is in the ‘finished’ state when using the Parallel Computing Toolbox 4.1 (R2009a)

Related Question