[R] mpirun question with Rmpi

[Martin Morgan]

"Erin Hodgess" <erinm.hodgess at gmail.com> writes:

> Dear R People:
>
> I'm running Rmpi on a single machine and I have the following
> statement from the command line:
>
>  mpirun -np 3 ./R --no-save < eek1.in >stuff4.out

All three versions of eek1.in write to the same location, over-writing
one another. You happen to see the results of the third process; some
other time you might see the three outputs intermingled.

The solutions are to have eek1.in create an appropriate output file
(e.g., using mpi.comm.rank() to uniquify a base name) or to design
eek1.in so that one of the nodes collates and outputs the results from
all the others (i.e., only one node writes; a typical solution might
include mpi.gather.Robj followed by a conditional based on
mpi.comm.rank).

Hope that helps.

Martin

> The stuff4.out file only contains the third result.  Is there a way to
> fix this such that it shows all 3 sets, please
>
> Thanks in advance,
> Erin
>
> -- 
> Erin Hodgess
> Associate Professor
> Department of Computer and Mathematical Sciences
> University of Houston - Downtown
> mailto: erinm.hodgess at gmail.com
>
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-- 
Martin Morgan
Computational Biology / Fred Hutchinson Cancer Research Center
1100 Fairview Ave. N.
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