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Does GPU coder have only one output?

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lim daehee
lim daehee el 22 de Nov. de 2019
Editada: lim daehee el 27 de Nov. de 2019
I'm changing a function into mex file with GPU coder, and I have a problem while I using the GPU coder.
I want to get two matrices; D, N as the output of fcn_DH.
When I executed GPU coder with a code below, Running test file with MEX is not terminated, thus I cannot make MEX file.
However, When I changed the first line of the function into 'D = fcn_PRM(node,PosMap)', which has only one output, the GPU coder worked fine.
I'm wondering if I can apply the GPU coder to a function and only get one variable as a result.
Otherwise, if GPU coder can multiple outputs, I want to know which part of my code is wrong.
function [D,N] = fcn_PRM(node,PosMap)
n = length(node);
D = coder.nullcopy(zeros(n,n,2));
N = coder.nullcopy(zeros(n,n));
len=(1:n)';
pos_mat=PosMap(node(len),:);
coder.gpu.kernel;
for i=1:n-1
for j=i+1:n
dist=sqrt((pos_mat(i,1)-pos_mat(j,1))^2+(pos_mat(i,2)-pos_mat(j,2))^2+(pos_mat(i,3)-pos_mat(j,3))^2);
B = collisionCheck_SP5(PosMap(node(i),:), PosMap(node(j),:));
D(i,j,1) = dist;
N(i,j) = B;
end
end
  6 comentarios
Pravin Jagtap
Pravin Jagtap el 25 de Nov. de 2019
Hello Lim,
Refer to following documentation to understand GPU coder workflow:
For code generation, we need to define 'primary' function which is 'fcn_PRM' in your case and 'entry-point function' which is used for the defining the input variables.
Still earlier issue persists since you are loading the data from ''dlite_small.mat'' which is not accessible to me. Also, please verify the code and provide all the necessary inputs for reproducing the error by executing the code.
lim daehee
lim daehee el 25 de Nov. de 2019
Hello Parvin,
Thank you for your continuous help.
In my case, the entry-point function is the main code, which starts with loading the dlite_small.mat file. I followed all procedures of GPU coder app on documentation you send to me. However, GPU coder app does not complete at a certain stage on attached figure.
Also, I don't understand why are you cannot accessible to "dlite_small.mat"file. I just confirmed that all files and codes are work well on my computer now. So I attach dlite_small.mat and all codes.
Thanks for your help.
Sincerely.

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Pravin Jagtap
Pravin Jagtap el 25 de Nov. de 2019
Hello Lim,
After analyzing the code, It is clear that you are not able to generate ‘MEX’ because the ‘%#codegendirective is missing in the function definition at beginning. To generate the ‘MEX’ please add the ‘%#codegen’ directive as shown below at the starting of the Entry-Point function:
function [D,N] = fcn_PRM(node_PRM,PosMap) %#codegen
%…
%…
end
Also, make sure that the same function is getting called in the ‘Define Input Type’ stage.
Kind Regards
~Pravin
  3 comentarios
Pravin Jagtap
Pravin Jagtap el 26 de Nov. de 2019
Hello Lim,
One of the possible reasons can be the data copy from Device to Host which can add extra overhead and the size of matrix is also considerable in your case. There can be other possible reasons as well.
~Pravin
lim daehee
lim daehee el 27 de Nov. de 2019
Editada: lim daehee el 27 de Nov. de 2019
Hello Parvin,
I always thanks to you for your help and I have a question about your reply.
Is the matrix size can cause the increase of calculation time?
The map data which I gave you is smaller one.. actual map size is 1701*1701*11 double and size of 'node' is 1900.
If my problem is caused by the size of the map data matrix, I want to know the maximum size of matrix that GPU coder can work properly.
Also, I know that GPU coder don't create kernel for indexing of matrix, is that right?
Plus, I realized that my problem is caused by data size of array N. The data size of N is 576kb. I wonder why the size of array cause the increase of calculation time.
Also, I wonder both maximum size of array and maximum data size of array that GPU coder can work properly.
Sincerely.
Lim.

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