Passing composite variable to mex file
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I am running an spmd, and I am wondering if there is a way to pass a composite variable to a mex file without "aggregating" it first. The following is a (simple) example. Say I have the following code.
parpool(2);
spmd
test = labindex + zeros(1000, 2);
end
result = sum([test{:}], 2);
Suppose I would like to replace the sum function with a C/mex implementation of it. It is possible to do something like the following:
test_cellarray = test(:);
result = sum_function(test_cellarray); % Not a built-in function
where sum_function takes in cell arrays. However, in the above "solution", the first line takes up the vast majority of the time.
Is it possible to pass "test" directly to a mex function and access the parts for different workers through pointers?
Thanks for the help.
2 个评论
James Tursa
2022-1-31
What exactly is the test variable? I.e., what does "whos test" show?
Vivek Bhattacharya
2022-1-31
采纳的回答
Edric Ellis
2022-1-31
0 个投票
Unfortunately, there is no way to access the elements of a Composite from a MEX file. Is there any way you could run the MEX file directly on the workers? If you need to run it on each element, that would probably be the best way.
2 个评论
Vivek Bhattacharya
2022-1-31
Edric Ellis
2022-1-31
You might be better off collecting the data on a single worker, and working with it there. Worker-to-worker communication is generally more efficient than worker-to-client. I.e. something like:
spmd
myVal = someComputation();
catDim = 1; % dimension to concatenate results
targetWorker = 1;
allVals = gcat(myVal, catDim, targetWorker);
if labindex == targetWorker
endResult = doStuff(allVals);
end
end
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