mpi.exit terminates MPI execution environment and detaches the
library Rmpi. After that, you can still work on R.
mpi.quit terminates MPI execution environment and quits R.
mpi.exit()
mpi.quit(save = "no")mpi.exit always returns 1
the same argument as quit but default to "no".
Hao Yu
Normally, mpi.finalize is used to clean all MPI states.
However, it will not detach the library Rmpi. To be more safe leaving MPI,
mpi.exit not only calls mpi.finalize but also detaches the
library Rmpi. This will make reload the library Rmpi impossible.
If leaving MPI and R altogether, one simply uses mpi.quit.
mpi.finalize