[R] makeCluster() hangs infinitely

[Henrik Bengtsson]

Hi,

did you see my answer on StackOverflow? Specifically, if you set
argument 'outfile = NULL' to either of those two functions, you'll get
a little bit more information that *might* provide some clues.

/Henrik


On Sun, Sep 16, 2018 at 5:38 PM Zhihao Huang <zhhhwang using umich.edu> wrote:
>
> Hi all,
>
> The function makeCluster() of parallel does not work on my laptop. It hangs
> infinitely.
>
> *1. Problem Summary:*
>
> > # Loading parallel packages
>
> > library(parallel)
>
> > cl <- makeCluster(2) # It hangs at this line of code.
> It hangs at the second line of the code.
>
> *2. Potential Reason*
> I also tried to see the details of what it does internally by using the
> following code.
>
> > library(future)
>
> > cl <- future::makeClusterPSOCK(1L, verbose = TRUE) # It hangs at this
> line of code.
> And it returns the following descriptions and hangs.
>
> *Workers: [n = 1] ‘localhost’*
>
> *Base port: 11214*
>
> *Creating node 1 of 1 ...*
>
> *- setting up node*
>
> *Starting worker #1 on ‘localhost’:
> '/Library/Frameworks/R.framework/Resources/bin/Rscript'
> --default-packages=datasets,utils,grDevices,graphics,stats,methods -e
> 'parallel:::.slaveRSOCK()' MASTER=localhost PORT=11214 OUT=/dev/null
> TIMEOUT=2592000 XDR=TRUE*
>
> *Waiting for worker #1 on ‘localhost’ to connect back*
> So the problem is that the "worker #1 on 'local host'" never connects back,
> and that's why it hangs forever. I have no idea what causes this.
>
> *3. my sessionInfo():*
>
> R version 3.5.1 (2018-07-02)
>
> Platform: x86_64-apple-darwin15.6.0 (64-bit)
>
> Running under: macOS High Sierra 10.13.6
>
>
> Matrix products: default
>
> BLAS:
> /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRblas.0.dylib
>
> LAPACK:
> /Library/Frameworks/R.framework/Versions/3.5/Resources/lib/libRlapack.dylib
>
>
> locale:
>
> [1] en_US.UTF-8/en_US.UTF-8/en_US.UTF-8/C/en_US.UTF-8/en_US.UTF-8
>
>
> attached base packages:
>
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
>
> loaded via a namespace (and not attached):
>
> [1] compiler_3.5.1
>
> I spent hours searching for the solutions but failed. It looks like some
> other people met similar problem here
> <http://r.789695.n4.nabble.com/makeCluster-hangs-td4748238.html>. Also, I
> posted this question online here
> <https://stackoverflow.com/questions/52264460/r-parallel-makecluster-hangs-infinitely-on-mac/52284709#52284709>
> a
> week ago.
>
> Any suggestion would be appreciated. Thanks a lot!
>
> Thanks,
> Zhihao
> --
> Zhihao (Daniel) Huang
> Graduate Student
> Department of Statistics,
> University of Michigan, Ann Arbor
> Email: zhhhwang using umich.edu
>
> --
> 黄 之昊
> Zhihao Huang
>
> Graduate Student
> Department of Statistics,
> University of Michigan, Ann Arbor
> Email: zhhhwang using umich.edu
>
>         [[alternative HTML version deleted]]
>
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