Using NET Assembly in parallel pool/ worker/ parfeval

Question

Ronron 2017-2-16

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325381-using-net-assembly-in-parallel-pool-worker-parfeval

回答： Ronron 2017-2-21

I would like to pass an object from a class of a NET Assymbly in a parallel pool by executing the function via parfeval. I always get the following error.

"Warning: Cannot load an object of class 'MAPort': No matching constructor signature found."

I already tried the following things.

First I loaded the NET Assembly by usind spmd ... end

spmd
    try
        NET.addAssembly('dSPACE.HILAPI.MAPort');
        import ASAM.HILAPI.dSPACE.MAPort.*;
    catch e
        error(e.message)
    end
end

Secondly I tried to load the library by calling parfevalForALL.

F2 = parfevalOnAll(@loadNetAssembly,0);
function loadNetAssembly()
try
    NET.addAssembly('dSPACE.HILAPI.MAPort');
    import ASAM.HILAPI.dSPACE.MAPort.*;
catch e
    error(e.message);
end

I also tried to import the classes everywhere. And after trying a lot yesterday it worked. But today it didn't work again and I didn't change the code. So I really don't know whats the right way. Can anyone help?

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Ronron 2017-2-17

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Answer 1

Ronron 2017-2-21

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/325381-using-net-assembly-in-parallel-pool-worker-parfeval#answer_255700

I can answer to my question myself. Actually the problem is the specific NET Assembly that I wanted to use in the parallel pool. I just found out, that the ASAM.HILAPI does not support multithreading in Matlab. So it is a specific problem according to the Assmebly.