dump netcdf command¶
dump netcdf/mpiio command¶
dump ID group-ID netcdf N file args dump ID group-ID netcdf/mpiio N file args
ID = user-assigned name for the dump
group-ID = ID of the group of atoms to be imaged
netcdf or netcdf/mpiio = style of dump command (other styles atom or cfg or dcd or xtc or xyz or local or custom are discussed on the dump doc page)
N = dump every this many timesteps
file = name of file to write dump info to
args = list of atom attributes, same as for dump_style custom
dump 1 all netcdf 100 traj.nc type x y z vx vy vz dump_modify 1 append yes at -1 thermo yes dump 1 all netcdf/mpiio 1000 traj.nc id type x y z dump 1 all netcdf 1000 traj.*.nc id type x y z
Dump a snapshot of atom coordinates every N timesteps in Amber-style NetCDF file format. NetCDF files are binary, portable and self-describing. This dump style will write only one file on the root node. The dump style netcdf uses the standard NetCDF library. All data is collected on one processor and then written to the dump file. Dump style netcdf/mpiio uses the parallel NetCDF library and MPI-IO to write to the dump file in parallel; it has better performance on a larger number of processors. Note that style netcdf outputs all atoms sorted by atom tag while style netcdf/mpiio outputs atoms in order of their MPI rank.
NetCDF files can be directly visualized via the following tools:
Ovito (http://www.ovito.org/). Ovito supports the AMBER convention and all extensions of this dump style.
AtomEye (http://www.libatoms.org/). The libAtoms version of AtomEye contains a NetCDF reader that is not present in the standard distribution of AtomEye.
The netcdf and netcdf/mpiio dump styles are part of the USER-NETCDF package. They are only enabled if LAMMPS was built with that package. See the Build package doc page for more info.