How can I increase the CPU utilization during the use of the function "matlabFunction"

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Mathias Blandeau 2015-11-6

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回答： Mathias Blandeau 2015-11-23

Hello,

I am working on a linked chain model using symbolic notation with MuPad. After I create the matrix of the model in MuPad, I reassigne it in the Matlab notebook with the function "getVar" then I create a function with "matlabFunction".

The matrix I calculate are quite big (more than 1Mo text) and it can take several hours to write them. When I look at the performance of the computer (I have a intel i7 with 2,6GHz and 8Go of RAM), I realize that matlab only use 25% of the CPU during the writing of the function. I there any way to increase this number during this precise function ?

Thank you in advance.

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Mathias Blandeau 2015-11-6

Yes, I have a dual core with hyper-threading but when i look at the computer performance, the CPU utilization is not attributed to only one core. Still the CPU use by Matlab never goes over 25%

Walter Roberson 2015-11-7

If you have hyper-threading turned on in your system, your process monitor might be reading the 2 cores as being 4 effective cores and calculating the CPU against that. The relevant code is simply not multi-threaded at this time, so you will not get more than a full CPU dedicated to the task.

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Answer 1

Walter Roberson 2015-11-6

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Consider generating the code in MuPAD; see http://www.mathworks.com/help/symbolic/create-matlab-functions-from-mupad-expressions.html#bswkjwe-1

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Mathias Blandeau 2015-11-6

Thanks for the answer, it is very much quicker than with matlab, althought not optimized, I will try to combined it with generate::optimize as advised on the other topic

Now the programme working is mupkern and not matlab but it is still blocked at 25% of the CPU

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Answer 2

Mathias Blandeau 2015-11-23

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Hi, I think I figured out the origin of the problem. To my suprise, the over complexity of the result was du to the function linalg::scalarProduct (??). After I wrote the scalar product manually (u.v = u1*v1 + u2*v2+...) it worked very well, especially during the generation of the function. Thanks again !