How to use Task.Diary

Question

Xinyi Shen 2014-5-25

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/131020-how-to-use-task-diary

编辑： Xinyi Shen 2014-6-8

Hi, I have difficulty in outputting information to matlab command window when multi-task are running. Specifically I am using a independent multi-task parallel mode. Below is the way I created my multi-task within one job

    parallel.defaultClusterProfile('local');
    cluster = parcluster();
    job = createJob(cluster);
    createTask(job, funcHandles, numArray, args,'CaptureDiary',true);
    submit(job);
    wait(job);
    results = fetchOutputs(job);

Within each funcHandle, I want to output some text during the execution. It is said that after matlab 2012b, this functionality is enabled through parallel.Task.Diary property. However, I can neither get nor set such property during the running of the task.There is completely no examples or explanation on how to access this property at all.

I know that I can output the info into a log file. But I still prefer to display something in the command window.

Can anyone help me? Thank you.

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Answer 1

Edric Ellis 2014-6-2

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https://ww2.mathworks.cn/matlabcentral/answers/131020-how-to-use-task-diary#answer_139103

在 MATLAB Online 中打开

The task "diary" property is updated automatically when your task function would emit text to the command window. For example:

   c = parcluster('local');
   j = createJob(c);
   t = createTask(j, @disp, 0, {magic(4)}, 'CaptureDiary', true);
   submit(j);
   wait(j);
   t.Diary

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Edric Ellis 2014-6-3

在 MATLAB Online 中打开

You can execute "t.Diary" at any time - including before "wait(j)". So, you might do:

...
submit(j);
while ~strcmp(j.State, 'finished')
  disp(t.Diary);
  pause(5);
end

Of course, that will display the entire diary each time around the "while" loop. You might want to do something more sophisticated like checking the diary to display only the new lines.

Xinyi Shen 2014-6-8