Problem with R on dual core under Linux - can not execute mpi.spawn.Rslaves()

Hi

I am trying to utilize my dual core processor (and later a
High-performance clusters (HPC) ) by using the Rmpi, snow, snowfall,
... packages, but I am struggling at the beginning, i.e. to initialise
the "cluster" on my dual core computer. Whenever I try to initialize
it (via sfInit(parallel=TRUE, cpus=2) or mpi.spawn.Rslaves(nslaves=2)
), I get an error message:

sfInit(parallel=TRUE, cpus=2)

Forced parallel. Using session: XXXXXXXXR_rkrug_143706_092708

Error in mpi.comm.spawn(slave = mpitask, slavearg = args, nslaves = count,  :
  MPI_Comm_spawn is not supported.
Error in sfInit(parallel = TRUE, cpus = 2) :
  Starting of snow cluster failed! Error in mpi.comm.spawn(slave =
mpitask, slavearg = args, nslaves = count,  :
  MPI_Comm_spawn is not supported.

and

mpi.spawn.Rslaves(nslaves=2)

Error in mpi.spawn.Rslaves(nslaves = 2) :
  You cannot use MPI_Comm_spawn API

I followed the pdf "Developing parallel programs using snowfall" by
Jochen Knaus,. installed the relevant libraries and programs, but it
does not work.

I am stuck.

Any help appreciated,

Rainer

Rainer M. Krug, PhD (Conservation Ecology, SUN), MSc (Conservation
Biology, UCT), Dipl. Phys. (Germany)

Centre of Excellence for Invasion Biology
Faculty of Science
Natural Sciences Building
Private Bag X1
University of Stellenbosch
Matieland 7602
South Africa