Gerris in parallel run

Example of single run of Gerris

$ gerris3D -m tides.gfs | gfsview3D tides.gfv

In parallel run

$ gerris3D -m -s 1 tides.gfs > tidess.gfs

$ gerris3D -b 4 tidess.gfs > tidesb.gfs

$ mpirun -np 4 gerris3D tidesb.gfs