WebMar 4, 2013 · The doMC package provides a parallel backend for the foreach/%dopar% function using the multicore functionality of the parallel package. Now, parallel uses a fork mechanism to spawn identical copies of the R process. Collecting results from separate processes is an expensive task, and this is what you see in your time measurements. WebSep 1, 2016 · I think the issue is around your errorhandling and a bit of a misunderstanding of dopar. First, think of dopar more like a function. It must return an object back to the user by default as a list (it gathers all the output from each worker and the foreach function gathers these and returns them to use, see 'output_list' below).
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foreach - Parallelization in R: %dopar% vs %do%. Why using a …
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