Parallelization of independent computations to exploit 100% of multicore CPU (all cores)

Question

Martin Rack 2016-9-19

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/303583-parallelization-of-independent-computations-to-exploit-100-of-multicore-cpu-all-cores

编辑： José-Luis 2016-9-19

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I have a Matlab code

SOL=my_code(INPUTS)

I wish to run my code by sweeping the INPUTS variables over a wide range of values.

My PC has 4 cores. When I run my code my task manager indicates that Matlab is using in the range of 20-23% of the CPU. This is normal, it means that my code is being run on one of the four cores, which is running not far from 100% of it's capacity.

To exploit the full power of my CPU I open four Matlab terminals. Just to be clear: the Matlab program is running four times on my PC, I have four Matlab terminal windows. Each Matlab session is used to run my function my_code(INPUTS) in parallel.

My task manager informs me that each Matlab session is using 20-23% of my CPU, indicating that each code is being run by a dedicated core of my processor, and my net simulation speed is increased four fold.

So instead of running the following code with a single Matlab session (which uses max. 25% of CPU) :

for i=1:4
    SOL(i) = my_code( INPUTS(i) );
end

I run in parallel the four following computations, each of which exploits around 25% of CPU:

      % in Matlab session 1
      SOL1 = my_code( INPUTS1 );
----------------------------------------------
      % in Matlab session 2
      SOL2 = my_code( INPUTS2 );
----------------------------------------------
      % in Matlab session 3
      SOL3 = my_code( INPUTS3 );
----------------------------------------------
      % in Matlab session 4
      SOL4 = my_code( INPUTS4 );

This solution works well, but is far from being 'elegant', and opening up four Matlab sessions is a bit annoying, and I end up having a lot of active windows on my PC. I am sure there must be a way to exploit near 100% of my PC's CPU with a single Matlab session, any help would be greatly appreciated.

Thanks in advance,

F.-B.