MATLAB PARALLEL COMPUTING TOOLBOX - S Guide de l'utilisateur télécharger pdf (Page 23)

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Introduction to Parallel Solutions

1-9

batch runs your code on a local worker or a cluster worker, but does not require a

parallel pool.

You can use batch to run either scripts or functions. For more details, see the batch

reference page.

Run a Batch Parallel Loop

You can combine the abilities to offload a job and run a parallel loop. In the previous two

examples, you modified a for-loop to make a parfor-loop, and you submitted a script

with a for-loop as a batch job. This example combines the two to create a batch parfor-

loop.

Open your script in the MATLAB Editor:

edit mywave

Modify the script so that the for statement is a parfor statement:

parfor i = 1:1024

A(i) = sin(i*2*pi/1024);

end

Save the file and close the Editor.

Run the script in MATLAB with the batch command as before, but indicate that the

script should use a parallel pool for the loop:

job = batch('mywave','Pool',3)

This command specifies that three workers (in addition to the one running the batch

script) are to evaluate the loop iterations. Therefore, this example uses a total of four

local workers, including the one worker running the batch script. Altogether, there

are five MATLAB sessions involved, as shown in the following diagram.

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 655 656

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