lamhosts finds the host name associated with its node number. Can be used
by mpi.spawn.Rslaves to spawn R slaves on selected hosts. This is
a LAM-MPI specific function.
mpi.is.master checks if it is running on master or slaves.
mpi.hostinfo finds an individual host information including rank and
size in a comm.
slave.hostinfo is executed only by master and find all master and slaves
host information in a comm.
lamhosts()
mpi.is.master()
mpi.hostinfo(comm = 1)
slave.hostinfo(comm = 1, short=TRUE)a communicator number
if true, a short form is printed
lamhosts returns CPUs nodes numbers with their host names.
mpi.is.master returns TRUE if it is on master and FALSE otherwise.
mpi.hostinfo sends to stdio a host name, rank, size and comm.
slave.hostname sends to stdio a list of host, rank, size, and comm
information for all master and slaves. With short=TRUE and 8 slaves or more,
the first 3 and last 2 slaves are shown.