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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