Broadcast Variable Warning in MATLAB Parallel Computing Toolbox

1 次查看（过去 30 天）
Kareem Elgindy
Kareem Elgindy 2022-4-15
评论： Kareem Elgindy 2022-5-16
When I ran a MATLAB code using MATLAB Parallel Computing Toolbox, I got messages like:
The entire array or structure 'a' is a broadcast variable. This might result in unnecessary communication overhead.
The entire array or structure 'b' is a broadcast variable. This might result in unnecessary communication overhead.
The entire array or structure 'L' is a broadcast variable. This might result in unnecessary communication overhead.
I then got lost. The code is still running though, but I don't know what to do exactly to avoid the messages above. Below is a description of the main part of my code:
a = (5:5:100)'; b = (-0.4:0.1:2)'; L = (0.25:0.25:10)'; la = length(a); lb = length(b); lL = length(L);
parfor jj = 1:2
err1 = zeros(la,lb,lL);
for i = 1:la
if jj == 1, bla bla bla; else, bla bla bla; end
for j = 1:lb
for k = 1:lL
err1(i,j,k) = methods(a(i),b(j),L(k));
end
end
end
end

请先登录，再回答此问题。

采纳的回答

Matt J
Matt J 2022-4-15
编辑：Matt J 2022-4-15
In this case, the warnings can probably be ignored because a, b, and L are very small.
However, I don't really understand the parallelization stratgy, since the outer parfor loop is very short, and you seem to be doing almost nothing with the loop variable jj. If the intensive work is being done by methods(), I would think you would want to paralleilize over (i,j,k).
  9 个评论
显示 7更早的评论
Matt J
Matt J 2022-4-15
编辑：Matt J 2022-4-15
I still need err1 as a matrix of 3 dimensions to do further postprocessing using commands like squeeze along the i dimension, etc. So, reshape here remains useful as suggested by
It should have been 3-dimensional from the beginning and remained so throughout. The shape was established in the declaration line,
err1 = zeros(la,lb,lL);

请先登录，再进行评论。

更多回答（0 个）

类别

在 Help Center 和 File Exchange 中查找有关 Parallel Computing Fundamentals 的更多信息

标签

产品


版本

R2022a

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by