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help vectorize code for GPU

Asked by Octavian on 5 Apr 2015
Latest activity Edited by Matt J
on 5 Apr 2015
Dear All,
I have a for loop code snippet which in essence, involves 2D matrix or elementwise multiplication, and 2D matrix addition, for 2D sheets along the 3rd dimension in 3D double arrays. Here is what I mean:
for i=1:M
A(:,:,i)=B(:,:,i)* C(:,:,i);
D(:,:,i)=E(:,:,i).*F(:,:,i);
G(:,:,i)=H(:,:,i)+I(:,:,i);
end
Besides using parfor, is there a way to vectorize this code for GPU use to speed it (A-I are huge matrices).
Thank you, as always, Octavian

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1 Answer

Answer by Matt J
on 5 Apr 2015
Edited by Matt J
on 5 Apr 2015
 Accepted Answer

I assume all the arrays shown are gpuArrays. You can use pagefun for creating A
A=pagefun(@mtimes, B,C);
There is also mtimesx ( Download ) on the File Exchange which optimizes this kind of thing for CPU variables.
The remaining operations are already internally vectorized, both for ordinary CPU array variables and gpuArrays. You can just do
D=E.*F;
G=H+I;

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