bigGP.exit terminates the package's execution environment and
detaches the package. After that, you can still work in R.
bigGP.quit terminates the package's execution environment and quits R.
bigGP.exit()
bigGP.quit(save = "no")
the same argument as quit, but defaulting to "no".
These functions should be used to safely leave the "bigGP"
execution context, specifically MPI, when R is started via MPI such as
by calling mpirun or analogous executables. They close the slave
processes and then invoke either mpi.exit or mpi.quit.
If leaving R altogether, one simply uses bigGP.quit.
mpi.exit
mpi.quit