[gmx-users] Invalid command line argument: -np

[Mark Abraham]

Chih-Ying Lin wrote:
> Hi
> Since the -np flag is no longer necessary with grompp for the version 4.0,
> how to tell Gromacs the number of the nodes being compiled together ?

It determines the maximum number available from your MPI environment and 
uses that. So your MPI configuration and/or your mpirun command's 
arguments determine it.

Mark