Using parallel.pool.constant with parfeval

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Gerrit Schlömer
Gerrit Schlömer 2016-8-10
回答： Edric Ellis 2016-8-12
I've got large constant topological matrixes, I want to work with in parallel. I'm trying to find out how parfeval work's with a parallel.pool.constant. It's mentioned that it works on http://de.mathworks.com/help/distcomp/parallel.pool.constant.html
Here is my Test_Script.m:
Test = 1;
Testp = parallel.pool.Constant(Test)
for ab = 1:2
F(ab) = parfeval(@Test2,1);
end
parfor ab = 1:2
x(ab,:) = Testp.Value;
end
The function Test2.m ist only
function [out]=Test2()
out = Testp.Value
end
So the parfor-loop works, but the parfeval-loop says, that "Undefined variable "Testp" or class "Testp.Value"." Can you tell me, how it works?

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采纳的回答

Edric Ellis
Edric Ellis 2016-8-12
You need to explicitly pass the instance of parallel.pool.Constant into your parfeval call - it doesn't work like a global variable - it works more like an ordinary variable, but with some behind-the-scenes intelligence to minimise data transfers. So, here's what you'd need to change:
% In your script:
...
F(ab) = parfeval(@Test2, 1, Testp);
...
% In Test2.m:
function [out] = Test2(inConst)
out = inConst.Value;
end

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