[R-sig-hpc] Problem Running 'snow' on Several Machines

[Michael Smith]

All,

I want to run the following program:

library("snow")
cl <- makeSOCKcluster(c("localhost", "192.168.1.101"))
clusterCall(cl, function() Sys.info()[c("nodename","machine")])
stopCluster(cl)

I have set up SSH keys so I don't need to type a password when logging
in to 192.168.1.101. I'm using Fedora 13 on both machines.

What happens is that the program somehow hangs after 'makeSOCKcluster'
because it does not return to the R prompt and I have to hit Ctrl-C. It
also fails to establish the cluster:

$ R -q
> library("snow")

Attaching package: 'snow'

The following object(s) are masked from 'package:base':

    enquote

> cl <- makeSOCKcluster(c("localhost", "192.168.1.101"))

Attaching package: 'snow'

The following object(s) are masked from 'package:base':

    enquote


Attaching package: 'snow'

The following object(s) are masked from 'package:base':

    enquote

^C
> clusterCall(cl, function() Sys.info()[c("nodename","machine")])
Error in inherits(cl, "cluster") : object 'cl' not found


When I use makeSOCKcluster(c("localhost", "localhost")) everything works
fine locally.Below is more information on the system.

Thanks,
Michael



> sessionInfo()
R version 2.12.2 (2011-02-25)
Platform: x86_64-redhat-linux-gnu (64-bit)

locale:
 [1] LC_CTYPE=en_US.utf8       LC_NUMERIC=C
 [3] LC_TIME=en_US.utf8        LC_COLLATE=en_US.utf8
 [5] LC_MONETARY=C             LC_MESSAGES=en_US.utf8
 [7] LC_PAPER=en_US.utf8       LC_NAME=C
 [9] LC_ADDRESS=C              LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_US.utf8 LC_IDENTIFICATION=C

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base

other attached packages:
[1] snow_0.3-3
> Sys.getlocale()
[1]
"LC_CTYPE=en_US.utf8;LC_NUMERIC=C;LC_TIME=en_US.utf8;LC_COLLATE=en_US.utf8;LC_MONETARY=C;LC_MESSAGES=en_US.utf8;LC_PAPER=en_US.utf8;LC_NAME=C;LC_ADDRESS=C;LC_TELEPHONE=C;LC_MEASUREMENT=en_US.utf8;LC_IDENTIFICATION=C"
> library(help=snow)




                Information on package 'snow'

Description:

Package:       snow
Title:         Simple Network of Workstations
Version:       0.3-3
Author:        Luke Tierney, A. J. Rossini, Na Li, H. Sevcikova
Description:   Support for simple parallel computing in R.
Maintainer:    Luke Tierney <luke at stat.uiowa.edu>
Suggests:      Rmpi,rpvm,rlecuyer,rsprng,nws
License:       GPL
Depends:       R (>= 2.3), utils
Packaged:      Fri Jul 4 18:07:30 2008; luke
Built:         R 2.12.2; ; 2011-04-21 03:02:00 UTC; unix

Index:

clusterSetupRNG         Uniform Random Number Generation in SNOW
                        Clusters
clusterSplit            Cluster-Level SNOW Functions
getMPIcluster           Starting and Stopping SNOW Clusters
parLapply               Higher Level SNOW Functions