Parallel toolbox using parfor loop

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abdullah alzaqebah 2018-4-2

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https://ww2.mathworks.cn/matlabcentral/answers/392198-parallel-toolbox-using-parfor-loop

评论： abdullah alzaqebah 2018-4-4

hello all i have the following part of my code: parpool(8);

 tm00=tic;
 parfor i=1:1:size(sss0,2)
   maxflows((sss0{1,i}(1,:)),(sss0{1,i}(2,:)),(sss0{1,i}(3,:)),source,sink);  
 end
tm01=toc(tm00)

the variable sss0 is a cell array represents a graph in each cell, i am using parallel to speed up the computation, i want to compute the maximum flow for each graph from source to sink. maxflows is a function that i was create it to adjust parameter then use maxflow built in function to calculate it. when i use 8 workers i get longer time from using 1 worker

any suggestions

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回答（1 个）

Matt J 2018-4-2

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编辑：Matt J 2018-4-4

Typically, this is because the processing task is too simple to make the costs of parallelizing the execution worthwhile. If maxflows is doing very little work, for example, the cost of broadcasting the data to the parallel workers could dominate whatever maxflows is doing.