Re: [R] makeSOCKcluster

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Fri 01 Sep 2006 - 05:59:55 GMT

On Fri, 1 Sep 2006, Hrishikesh Rajpathak wrote:

> Hi,
>

> I am a newbie to R and trying to implement parallelism in R. I am

> currently using R-2.3.1, and Cygwin to run R on Windows xp.

Did you build R under Cygwin (which is not a supported platform), or are you running a native Windows build of R? If the latter, you may be being optimistic to expect R to run Unix commands in the same way as under Unix.

I presume you mean this line in package snow:

    system(paste(rshcmd, "-l", user, machine, "env", env, script))  

which appears to be attempting to run a shell script: no shell is used by system() on Windows R. As the return value is not checked, this will not fail.

R under Windows differs from R under Unix in a number of ways, and system() is a major one.

> ssh and all are working fine,
>

> When I try to create a socket connection as

>
> makeSOCKcluster(c("localhost","localhost")),

>
> it just waits for the other prcess on localhost to get created and respond. But this other process is not created.

>
> To debug, I put print statements in the "snow " file in library\snow\r of R after every statement that comes under Socket Implementation. I realized that it does the execution till

>
> system(a<-paste(rshcmd, "-l", user, machine, "env", env, script))

>
> part and then it goes in wait state. It cannot run the next command which is

>
> con <- socketConnection(port = port, server=TRUE, blocking=TRUE,
> open="a+b")
>
> can someone please tell me what exactly could be the problem?
>
> Thank you,
> Rishi

-- 
Brian D. Ripley,                  ripley@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

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Received on Fri Sep 01 16:07:32 2006

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