Re: [julia-users] R code to Julia Performance issues with pmap

[Michael Borregaard]

I am not seeing your speed-up in R? elapsed is less time, but user 
significantly more, and it is the sum that counts.
When executing in parallel the language needs to copy the data to the 
workers. If the matrices are large, that takes longer than the speedup of 
the parallel execution. See what happens with a smaller matrix and then 
repeating the operation on the workers.