R version 3.5.0 (2018-04-23) -- "Joy in Playing"
Copyright (C) 2018 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin17.5.0 (64-bit)

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> jobs <- lapply(1:10, FUN = parallel::mcparallel)
> values <- parallel::mccollect(jobs)
> unlist(values)
3805 3806 3807 3808 3809 3810 3811 3812 3813 3814 
   1    2    3    4    5    6    7    8    9   10 
> warnings()
> 
> proc.time()
   user  system elapsed 
  0.322   0.073   0.340