[R] makeCluster() hangs infinitely

[Zhihao Huang]

Hi Henrik,

Thanks for the suggestions! I tried your approach, and obtained the
following output, which is pretty similar to the previous ones.

> cl <- future::makeClusterPSOCK(1, outfile = NULL, verbose = TRUE)

*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= TIMEOUT=2592000
XDR=TRUE*

*Waiting for worker #1 on ‘localhost’ to connect back*

starting worker pid=13731 on localhost:11214 at 15:48:41.991
I guess this is a connection problem. I am not sure what these numbers
mean. Do you have any further idea on this? I very much appreciate it!

Thanks,
Zhihao
--
Zhihao (Daniel) Huang
Graduate Student
Department of Statistics,
University of Michigan, Ann Arbor
Email: zhhhwang using umich.edu



On Mon, Sep 17, 2018 at 12:38 AM Henrik Bengtsson <
henrik.bengtsson using gmail.com> wrote:

> 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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>

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