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Subject: [OMPI users] Rmpi and LAM
From: Paul Wardman (paul.wardman_at_[hidden])
Date: 2009-01-29 05:57:41

I'm using R on a Ubuntu 8.10 machine, and, in particular, quite a lot of
papply calls to analyse data. I'm currently using the LAM implementation, as
it's the only one I've got to work properly. However, while it works fine on
one PC, it fails with the error message

Error in mpi.comm.spawn(slave = system.file("", package =
"Rmpi"), :
  MPI_Error_string: error spawning process

when I try to run it over a network on two machines. However, I've got
passwordless ssh working fine, and the lamnodes command seems to suggest
I've got all the nodes up and running fine (the other computer is also
Ubuntu 8.10) and lamhosts() from within R shows all the nodes perfectly
well. I've even got mpirun to work on both machines.

Can anyone help with (A) getting my current setup with R to work and / or
(B) suggestions for getting OpenMPI to work at all! (and preferably on
multiple machines).

Many thanks,
Paul Wardman
University of York