mpi.comm.size {Rmpi}

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

Author(s)

Hao Yu

References

https://www.open-mpi.org/

Examples

#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)