Waitbar in a spmd block in a GUI?

Question

Ben11 2014-1-28

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/114033-waitbar-in-a-spmd-block-in-a-gui

评论： Ben11 2014-1-29

Is there a way to monitor the progress of a calculation inside a spmd block? In the example below I would use a waitbar inside the outermost loop, but they are not allowed in spmd blocks. Any idea on what I could do?

Thanks a lot for your input.

Here is a very simplified version of the code.

   spmd
                % This is the place where I would initialize a waitbar normally.
                for i = 1:A
                    for k =2:B
                      %Do stuff
                    end
                 % This is the place where I would put the waitbar.eg. waitbar(i/...)
                end
    end

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Answer 1

Edric Ellis 2014-1-29

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https://ww2.mathworks.cn/matlabcentral/answers/114033-waitbar-in-a-spmd-block-in-a-gui#answer_122573

In R2013b, there's the new function PARFEVAL which lets you program the pool workers asynchronously - one of the things this allows is to update graphics such as a progress bar.

You can't use PARFEVAL with the communicating features of SPMD such as labSend and labReceive.

There's an example here using PARFEVAL to use pool workers and display a waitbar.