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Code optimization with GPU

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POHL Michel 2021-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/718465-code-optimization-with-gpu

评论： Joss Knight 2021-1-16

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Hi everyone, I have the following line of codes which I would like to parallelize on the GPU :

U = zeros(q, M, q, 'gpuArray');
for j=1:q
    U(j,:,j) = my_line_vector;
end

Is there any way to suppress the loop?

Thes are the lines of code that run the slowest in my program.

Thank you in advance

Michel

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Joss Knight 2021-1-16

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https://ww2.mathworks.cn/matlabcentral/answers/718465-code-optimization-with-gpu#answer_599220

编辑：Joss Knight 2021-1-16

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I = reshape(gpuArray.eye(q),q,1,q);
U = I.*my_line_vector;

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POHL Michel 2021-1-16

Thank you, it works!

I did not know that the element wise product worked with matrices with different size.

Joss Knight 2021-1-16

https://uk.mathworks.com/help/matlab/matlab_prog/compatible-array-sizes-for-basic-operations.html

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