mpi.comm.maxsize, mpi.request.maxsize, and
mpi.status.maxsize find the lengthes of comm, request, and status
arrayes respectively.
mpi.realloc.comm, mpi.realloc.request and
mpi.realloc.status increase the lengthes of comm, request and
status arrayes to newmaxsize respectively if newmaxsize is
bigger than the original maximum size.
mpi.realloc.comm(newmaxsize)
mpi.realloc.request(newmaxsize)
mpi.realloc.status(newmaxsize)
mpi.comm.maxsize()
mpi.request.maxsize()
mpi.status.maxsize()an integer.
When Rmpi is loaded, Rmpi allocs comm array with size 10, request
array with 10,000 and status array with 5,000. They should be enough in
most cases. They use less than 150KB system memory. In rare case, one can
use mpi.realloc.comm, mpi.realloc.request and
mpi.realloc.status to increase them to bigger arrayes.