Rmpi (version 0.6-9)

mpi.comm.size: MPI\_Comm\_c2f, MPI\_Comm\_dup, MPI\_Comm\_rank, and MPI\_Comm\_size APIs

Description

mpi.comm.c2f converts the comm (a C communicator) and returns an integer that can be used as the communicator in external FORTRAN code. mpi.comm.dup duplicates (copies) a comm to a new comm. mpi.comm.rank returns its rank in a comm. mpi.comm.size returns the total number of members in a comm.

Usage

mpi.comm.c2f(comm=1)
  mpi.comm.dup(comm, newcomm)
  mpi.comm.rank(comm = 1)
  mpi.comm.size(comm = 1)

Arguments

comm

a communicator number

newcomm

a new communicator number

References

http://www.openmpi.org/

Examples

# NOT RUN {
#Assume that there are some slaves running
mpi.comm.size(comm=1)
mpi.comm.size(comm=0)

mpi.remote.exec(mpi.comm.rank(comm=1))
mpi.remote.exec(mpi.comm.rank(comm=0))

mpi.remote.exec(mpi.comm.size(comm=1))
mpi.remote.exec(mpi.comm.size(comm=0))

mpi.bcast.cmd(mpi.comm.dup(comm=1,newcomm=5))
mpi.comm.dup(comm=1,newcomm=5)
# }