[R] snow parLapply standard output

[Luke Tierney]

On Tue, 27 Mar 2007, Frank Preiswerk wrote:

> I am slightly confused by the way the standard output is redirected in a R
> snow cluster environment.
> I am using parLapply from the snow package to execute a function on my
> MPI/LAM cluster. How can I redirect standard output (produced using "cat")
> from this function back to the terminal where I invoked it? I intend to
> transmit some status information in advance to the final result of the
> function. I investigated the chain of functions called by parLapply and it
> seems that snow is designed to just retrieve the final result of the
> computation.

The R level only deals with final values.  There is currently no means
within snow to communicate status information back to the master.

By default output is redirected to /dev/null.  You can provide an
alternate destination with the outfile option and monitor those files
from another process.

Best,

luke

>
> Thanks in advance for any hints,
> Frank Preiswerk
>
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>
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-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:      luke at stat.uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu