[R] Problem with makePSOCKcluster R3.0.1

[Prof Brian Ripley]

On 03/10/2013 09:13, Anna Longari wrote:
> Hello,
> I am using function makePSOCKcluster to make parallel computation on 3 EC2
> Amazon machines.
> I have a passwordless between machines and ssh is correct.
> In the R 2.15.1 release this function works correctly.
> Installing R 3.0.1 on my EC2 machines makePSOCKcluster does not produce the
> cluster.
> If I run the function with outfile="" option, I obtain this message
>
> Error in socketConnection(master, port = port, blocking = TRUE, open =
> "a+b",  :
>    cannot open the connection
> Calls: <Anonymous> ... doTryCatch -> recvData -> makeSOCKmaster ->
> socketConnection
> In addition: Warning message:
> In socketConnection(master, port = port, blocking = TRUE, open = "a+b",  :
>    ip-10-158-31-12:11883 cannot be opened
> Execution halted
>
> Can you help me?

No.  The issue is in your configuration -- that sockets cannot be opened 
is not an R issue.

Look at the NEWS file to see what has changed and hence how you might be 
able to address it:

     • The port used by socket clusters is chosen randomly: this should
       help to avoid clashes observed when two users of a multi-user
       machine try to create a cluster at the same time.  To reproduce
       the previous behaviour set environment variable R_PARALLEL_PORT
       to 10187.


>
> Best regards
>
> Anna Longari
>
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
> R-help at r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.

PLEASE do: no HTML mail for a start, and use current R.



-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595