[Rd] makeCluster hangs

[Henrik Bengtsson]

A few quick comments:

* You mention R --vanilla, but make sure to try with
parallel::makeCluster(), so that you don't happen to pick up
snow::makeCluster() if 'snow' is attached and ahead of parallel on the
search() path.

* Try creating a single background worker, i.e. parallel::makeCluster(1L).

* Try with cl <- future::makeClusterPSOCK(1L, verbose = TRUE), which
gives the same thing, but it also show you some details on what it
does internally; that may give some clues where it stalls.

/Henrik

On Sat, Feb 10, 2018 at 12:11 PM, T. Florian Jaeger
<fjaeger at ur.rochester.edu> wrote:
> Hi all,
>
> I can't get the functionality of the package parallel to work. Specifically,
> makeCluster() hangs when I run it. I first noticed the problem when trying
> to run Rstan with multiple cores and the traced it back to the core package
> parallel. The following results in R hanging after the call to makeCluster.
>
> library(parallel)
>
> # Calculate the number of cores
> no_cores <- detectCores() - 1
>
> # Initiate cluster
> cl <- makeCluster(no_cores)
>
> I'm running MacOS High Sierra 10.13.3 (17D47) on a MacbookPro 2017 laptop
> with 4 cores.
>
> platform       x86_64-apple-darwin15.6.0
> arch           x86_64
> os             darwin15.6.0
> system         x86_64, darwin15.6.0
> status
> major          3
> minor          4.3
> year           2017
> month          11
> day            30
> svn rev        73796
> language       R
> version.string R version 3.4.3 (2017-11-30)
> nickname       Kite-Eating Tree
>
> The problem replicates in R --vanilla
>
>
> I've spent hours googling for solutions but can't find any reports of this
> problem. Any help would be appreciated.
>
>
> Florian
>
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