# What is the maximum size of array that GPU coder can works properly?

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lim daehee 2019-11-21

I am trying to make a code with GPU coder, however, there is a problem in my code. I want to execute GPU coder with a code named fcn_DH. fcn_DH has a subfunction named collisionCheck_SP4.
function D = fcn_DH(node,Map_Obs,PosMap,Obs_mat)
n = length(node);
D = 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);
if dist<=25
B = collisionCheck_SP4(PosMap(node(i),:), PosMap(node(j),:), Map_Obs, Obs_mat);
D(i,j)=dist*B;
end
end
end
D=D+D';
function B = collisionCheck_SP4(p1, p2,Map_Obs,Obs_mat)
P1=[round(p1(1)/0.3+1) round(p1(2)/0.3+1) round(p1(3)/0.3+1)];
P2=[round(p2(1)/0.3+1) round(p2(2)/0.3+1) round(p2(3)/0.3+1)];
chk_p=abs(P1-P2);
if (chk_p(1)>=chk_p(2)) && (chk_p(1)>=chk_p(3))
if P1(1)<P2(1)
X=[P1(1):P2(1)]';
else
X=[P2(1):P1(1)]';
end
Y=round(X.*(P2(2)-P1(2))/(P2(1)-P1(1))-(P2(2)-P1(2))/(P2(1)-P1(1))*P1(1)+P1(2));
Z=round(X.*(P2(3)-P1(3))/(P2(1)-P1(1))-(P2(3)-P1(3))/(P2(1)-P1(1))*P1(1)+P1(3));
elseif (chk_p(2)>chk_p(1)) && (chk_p(2)>=chk_p(3))
if P1(2)<P2(2)
Y=[P1(2):P2(2)]';
else
Y=[P2(2):P1(2)]';
end
X=round(Y.*(P2(1)-P1(1))/(P2(2)-P1(2))-(P2(1)-P1(1))/(P2(2)-P1(2))*P1(2)+P1(1));
Z=round(Y.*(P2(3)-P1(3))/(P2(2)-P1(2))-(P2(3)-P1(3))/(P2(2)-P1(2))*P1(2)+P1(3));
else
if P1(3)<P2(3)
Z=[P1(3):P2(3)]';
else
Z=[P2(3):P1(3)]';
end
X=round(Z.*(P2(1)-P1(1))/(P2(3)-P1(3))-(P2(1)-P1(1))/(P2(3)-P1(3))*P1(3)+P1(1));
Y=round(Z.*(P2(2)-P1(2))/(P2(3)-P1(3))-(P2(2)-P1(2))/(P2(3)-P1(3))*P1(3)+P1(2));
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
chk_obs=Map_Obs(Idxpt);
chk_col=sum(chk_obs,2);
if chk_col==size(chk_obs,1)
B=1;
else
B=0;
end
When I executed the GPU coder app with the upper side of the annotation line, GPU coder app worked well.
However, when I contained the code 'chk_obs=Map_Obs(Idxpt);', Running test file with MEX on GPU takes too much time and it does not terminated although there are no issues on CPU.
The line chk_obs=Map_Obs(Idxpt) finds values of indices of Map_Obs are true or false.
I think this problem is caused because of the size of the Map_Obs and the size of Map_Obs is (1701*1701*11 double) and the size of Idxpt is from (50~1500*1 double).
I tried a simple calcualtion with arrays which has the size of (1000x1000), the same problem is occurred.
So I wonder the limits of size that the GPU coder can calcuate..
Sorry for my bad english skills.. I wonder if my article can make you understand..
##### 1 个评论显示 无隐藏 无
Hi Lim,
Could you provide the code generation command and the inputs you used to generated the code?
1701x1701x11 and 1000x1000 are both large, but should be fine for GPU coder. Also, in the code you provided, it seems that Idxpt is not defined anywhere.

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