I am running LAMMPs in parallel using the PPPM/tip4p with AIREBO and LJ/longrange/TIP4P potential. Despite specifying the mpirun -n8 setting which specifies 8 processors, the log file still indicates:
orthogonal box = (-97.4982 -97.4982 -61.4878) to (97.4982 97.4982 62.9078)
1 by 1 by 1 processor grid
I do not have this issue when I compute using other potentials.
Also, I have collegues running LAMMPS on other machines and they have had issues computing using the PPPM/tip4p solver in parallel. Sometimes it works, at other times it doesn;t depending on the no. of processors you select.
Anyone have the same issues?