How can I choose which lines of a for loop to send to each worker?

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Marta 2017-4-26

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评论： Marta 2017-4-26

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Hi!

I am running a for loop where I compute 3 variables separately and then add them all up in the end, i.e.

for time=0:endtime
   calculate_a(a,u);
   calculate_b(b,u);
   calculate_c(c,u);
   u=a+b+c;
 end

I would like to parallelise this loop so that each calculation of a, b and c is done by an individual worker and they are all put together for the u calculation, i.e.:

   for time=0:endtime
     calculate_a(a,u); % performed by worker 1
     calculate_b(b,u); % performed by worker 2
     calculate_c(c,u); % performed by worker 3
     % all workers share their outcome and perform
     u=a+b+c;
   end

I am new to parallel computing in Matlab. Can you help me figure out how to go about this? Also, are there any problems in creating a stand-alone program (.exe) from Matlab when using parallel computing?

Many thanks! Marta

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Adam 2017-4-26

If you have a for loop like that I would assume it is more usual to parallelise the for loop with a simple parfor than to parallelise the contents of the loop which I guess would have to be done with batch or spmd commands

Marta 2017-4-26