LAMMPS (6 Oct 2016) # LAMMPS benchmark of granular flow # chute flow of 32000 atoms with frozen base at 26 degrees variable x index 1 variable y index 1 units lj atom_style sphere boundary p p fs newton off comm_modify vel yes read_data data.chute orthogonal box = (0 0 0) to (40 20 37.2886) 2 by 1 by 2 MPI processor grid reading atoms ... 32000 atoms reading velocities ... 32000 velocities replicate $x $y 1 replicate 2 $y 1 replicate 2 2 1 orthogonal box = (0 0 0) to (80 40 37.2922) 2 by 2 by 1 MPI processor grid 128000 atoms pair_style gran/hooke/history 200000.0 NULL 50.0 NULL 0.5 0 pair_coeff * * neighbor 0.1 bin neigh_modify every 1 delay 0 timestep 0.0001 group bottom type 2 3648 atoms in group bottom group active subtract all bottom 124352 atoms in group active neigh_modify exclude group bottom bottom fix 1 all gravity 1.0 chute 26.0 fix 2 bottom freeze fix 3 active nve/sphere compute 1 all erotate/sphere thermo_style custom step atoms ke c_1 vol thermo_modify norm no thermo 100 run 100 Neighbor list info ... 2 neighbor list requests update every 1 steps, delay 0 steps, check yes max neighbors/atom: 2000, page size: 100000 master list distance cutoff = 1.1 ghost atom cutoff = 1.1 binsize = 0.55 -> bins = 146 73 68 Memory usage per processor = 16.1265 Mbytes Step Atoms KinEng c_1 Volume 0 128000 3136556.5 6404.5051 119335.13 100 128000 3137168.3 6284.3873 119338.83 Loop time of 0.832365 on 4 procs for 100 steps with 128000 atoms Performance: 1038.006 tau/day, 120.140 timesteps/s 99.8% CPU use with 4 MPI tasks x no OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 0.5178 | 0.52208 | 0.52793 | 0.5 | 62.72 Neigh | 0.047003 | 0.047113 | 0.047224 | 0.0 | 5.66 Comm | 0.05233 | 0.052988 | 0.053722 | 0.2 | 6.37 Output | 0.00024986 | 0.00032717 | 0.00036693 | 0.3 | 0.04 Modify | 0.15517 | 0.15627 | 0.15808 | 0.3 | 18.77 Other | | 0.0536 | | | 6.44 Nlocal: 32000 ave 32000 max 32000 min Histogram: 4 0 0 0 0 0 0 0 0 0 Nghost: 5463 ave 5463 max 5463 min Histogram: 4 0 0 0 0 0 0 0 0 0 Neighs: 115133 ave 115133 max 115133 min Histogram: 4 0 0 0 0 0 0 0 0 0 Total # of neighbors = 460532 Ave neighs/atom = 3.59791 Neighbor list builds = 2 Dangerous builds = 0 Total wall time: 0:00:00