GPU time slower than CPU

Tiki Tiki

2018 7 20

0 个回答

3 次查看（30 天）

0 个投票

Hi everyone

Can you explain to me my code about gpu time?.

why gpu time is slower than CPU time.

this is my code:

    tic
n = 4096;
m = 1000;
A1 = ones(1,m);
B1 = 2*ones(m,n);
C1 = sum(A1*B1);
% wait(gpu)
toc
    tic
n = 4096;
m = 1000;
A2 = ones(1,m);
B2 = 2*ones(m,n);
C2 = sum(sum(bsxfun(@times,A2',B2)));
% wait(gpu)
toc
tic
n = 4096;
m = 1000;
A3 = gpuArray(ones(1,m));
B3 = gpuArray(2*ones(m,n));
C3 = sum(A3*B3);
% CB = sum(bsxfun(@times,AB',BB));
% wait(gpu)
toc

Thank

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Joss Knight 2018-7-21

Can you double-check your code? Because you're not actually doing the same thing on the GPU. For instance, you do a matrix multiplication on the GPU that you don't do on the CPU. The results aren't even the same dimensions.

请先登录，再进行评论。

请先登录，再回答此问题。

Follow Question