cluster/snow question

Hi Markus,

Many thanks. Is the "cluster" variable you mention below available in the
environment of the nodes ? Specifically, within that environment, how
could one identify the rank of that specific node ?

My code would use that information to partition the problem.

Thanks,
Tolga




Markus Schmidberger <schmidb at ibe.med.uni-muenchen.de>
09/09/2008 07:11
Please respond to
schmidb at ibe.med.uni-muenchen.de


To
tolga.i.uzuner at jpmorgan.com
cc
r-help at r-project.org
Subject
Re: [R] cluster/snow question






Hi Tolga,

in SNOW you have to start a cluster with the command

library(snow)
cluster <- makeCluster(#nodes)

The object "cluster" is a list with an object for each node and each
object again is a list with all informations (rank, comm, tags)
The size of the cluster is the length of the list.

#nodes == length(cluster)

E.g. the rank for node one you can get by

cluster[[1]]$rank

Best
Markus

tolga.i.uzuner at jpmorgan.com schrieb:

Dear R Users,

I am attempting to use the snow package for clustering. Is there a way

to

identfy, in the environment of each node, a rank for that node and also,

the total size of the cluster ?

By way of analogy, I am looking for the functions in snow equivalent to
mpi.comm.rank() and mpi.comm.size() from RMPI, in case that makes things

clearer.

Thanks in advance,
Tolga

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