using parallel computing outside a loop

Question

Aref Kalantari 2020-9-28

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/601366-using-parallel-computing-outside-a-loop

评论： Aref Kalantari 2020-9-29

Hi to everyone!

I have to calculate multiple similar inputs with a function that I have written myself and I wondered how i can use parallel computing in this case. I have used parfor in older and other problems already, but i dont know if there are other options to use paralel computing outside loops.

How can I use parallel computing to compute all these simultaneously?

my code is in the comments.

Thanks in advance

1 个评论
显示 -1更早的评论隐藏 -1更早的评论

Aref Kalantari 2020-9-28

在 MATLAB Online 中打开

tic
loop_new1 = ImRegbVal(Data_reg,bVec1(segment),0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc
tic
loop_new2 = ImRegbVal(Data_parts2,bVec2,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc
tic
loop_new3 = ImRegbVal(Data_parts3,bVec3,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc
tic
loop_new4 = ImRegbVal(Data_parts4,bVec4,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc
tic
loop_new5 = ImRegbVal(Data_parts4,bVec4,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc
tic
loop_new6 = ImRegbVal(Data_parts4,bVec4,0); %Plot GUI=1 , No plot GUI = 0    %128*128*2*36
toc

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

Raymond Norris 2020-9-28

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/601366-using-parallel-computing-outside-a-loop#answer_501979

在 MATLAB Online 中打开

Hi Aref,

You don't explain how you're already using parfor -- that could negate what else you can do.

Here's a crude example, there's a little cleanup/verifying to do, but it'll get you started in the right direction. Read more about parfeval to see how it can be used.

p = parpool();
dp = {Data_reg,Data_parts2,Data_parts3,Data_parts4,Data_parts4,Data_parts4};
bv = {bVec1(segment),bVec2,bVec3,bVec4,bVec4,bVec4};
% Submit jobs
for idx = 1:length(dp)
    f(idx) = parfeval(@ImRegbVal,dp{idx},bv{idx},0);
end
% Fetch results
for idx = 1:length(dp)
    [idx, val] = f.fetchNext;
    % Do something with loop # 'idx' and loop value 'val'
    %  ...
end