Sent from my phone. Please excuse my brevity.
On December 7, 2016 6:26:55 AM PST, Marc Girondot via R-help <r-help at r-project.org> wrote:
>Hi,
>
> From the documentation of ?options
>
>Options set in package parallel
>These will be set when package parallel (or its namespace) is loaded if
>
>not already set.
>
>mc.cores:
>a integer giving the maximum allowed number of additional R processes
>allowed to be run in parallel to the current R process. Defaults to the
>
>setting of the environment variable MC_CORES if set. Most applications
>which use this assume a limit of 2 if it is unset.
>
>Then I try:
> > getOption("mc.cores")
>NULL
>
>I suspect that my environment variable MC_CORES is not set. I test and
>that's right:
> > Sys.getenv("MC_CORES")
>[1] ""
>
>Then I do:
> > Sys.setenv(MC_CORES=4)
> > Sys.getenv("MC_CORES")
>[1] "4"
>
>But when I try again getOption("mc.cores"); it does not change:
> > getOption("mc.cores")
>NULL
>
>Probably I do something wrong but I don't see what !
>
>Thanks
>
>Marc
>
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