From fjaeger at ur.rochester.edu  Sun Feb 11 21:51:57 2018
From: fjaeger at ur.rochester.edu (T. Florian Jaeger)
Date: Sun, 11 Feb 2018 15:51:57 -0500
Subject: [Rd] makeCluster hangs
In-Reply-To: <CAFDcVCT3LvyfHa+duqD-sjbrr07cgoZ_Z=HymouOP8neWRGdKQ@mail.gmail.com>
References: <d5cb6887-2745-8e8a-a510-302ad736dbad@ur.rochester.edu>
 <CAFDcVCT3LvyfHa+duqD-sjbrr07cgoZ_Z=HymouOP8neWRGdKQ@mail.gmail.com>
Message-ID: <18085b5b-f50e-215d-e879-da94cf1ffcb1@ur.rochester.edu>

Dear Henrik,

thank you, for the quick reply. Bizarrely enough, the problem vanished when
I woke the computer from sleep (I had previously replicated the problem
after several restarts of both R and the MacOS).

I will follow-up if I can again replicate the problem.

Florian


On 2/10/18 4:39 PM, Henrik Bengtsson wrote:
> 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
>>
>> ______________________________________________
>> R-devel at r-project.org mailing list
>> https://urldefense.proofpoint.com/v2/url?u=https-3A__stat.ethz.ch_mailman_listinfo_r-2Ddevel&d=DwIBaQ&c=kbmfwr1Yojg42sGEpaQh5ofMHBeTl9EI2eaqQZhHbOU&r=O6dqVFPEDpdoXY3wkv8u6o0LHKx4WbQ_itn0O87jj5s&m=R7DIWWqYTP2xarhrvKcymtN3XlAQ9vHLFDhPL6FxQ60&s=7F8Lez-XE8iC2JBU4JYsEtF3U0HObhMnCASud5xTgNM&e=
> .
>

-- 
T. Florian Jaeger
Professor of the Brain and Cognitive Sciences,
Computer Science
Alfred P. Sloan Research Fellow
University of Rochester,
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[Rd] makeCluster hangs
T. Florian Jaeger