MATLAB: How to retrieve error message when running script on cluster

cluster error remote

Hi,

I am running batch jobs using MATLAB remotely on a cluster. How to view the eventual error messages(where I hope to find the line of code where the problem is)? Thanks in advance.

Best Answer

The task within the job object returned by the batch command has a property called Error which has the error stack. You could do something like this:

job = batch('assert(false)');
wait(job);
getReport(job.Tasks(1).Error)

Also note that if you simply call load on the job you'll see the error.

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MATLAB: Speeding up a batching process that takes too long

You can use parfeval on top of a parallel pool to do this. (Note that by opening a parallel pool of workers, you're actually reducing the number of workers available to run batch jobs - workers can work on either parallel pool things ( parfor, parfeval, and spmd ), or batch - but not both at the same time).

The programming interface to parfeval is broadly similar to batch, so it should not be too difficult to adapt your code to use that instead. parfeval has the advantage of lower overheads once your parallel pool is set up ( batch has to launch a new MATLAB worker process for each task that it executes).

MATLAB: Batch Processing of a Function with Different Arguments

I think code that looks something like this will work:

    for jobIdx = 1:length(nVector)
        jobs(jobIdx) = batch('longjob', 1, {nVector(jobIdx)});
    end
    for jobIdx = 1:length(jobs)
        % Wait for the job to finish running before getting its output
        wait(jobs(jobIdx));
        diary(jobs(jobIdx), ['job' num2str(jobIdx) 'out.txt']);
    end

Best Answer

Related Solutions

MATLAB: Speeding up a batching process that takes too long

MATLAB: Batch Processing of a Function with Different Arguments

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