LAMMPS (6 Oct 2016) # LAMMPS benchmark of granular flow # chute flow of 32000 atoms with frozen base at 26 degrees 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) 1 by 1 by 1 MPI processor grid reading atoms ... 32000 atoms reading velocities ... 32000 velocities 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 2 912 atoms in group bottom group active subtract all bottom 31088 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 = 73 37 68 Memory usage per processor = 16.0904 Mbytes Step Atoms KinEng c_1 Volume 0 32000 784139.13 1601.1263 29833.783 100 32000 784292.08 1571.0968 29834.707 Loop time of 0.534174 on 1 procs for 100 steps with 32000 atoms Performance: 1617.451 tau/day, 187.205 timesteps/s 99.8% CPU use with 1 MPI tasks x no OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 0.33346 | 0.33346 | 0.33346 | 0.0 | 62.43 Neigh | 0.043902 | 0.043902 | 0.043902 | 0.0 | 8.22 Comm | 0.018391 | 0.018391 | 0.018391 | 0.0 | 3.44 Output | 0.00022411 | 0.00022411 | 0.00022411 | 0.0 | 0.04 Modify | 0.11666 | 0.11666 | 0.11666 | 0.0 | 21.84 Other | | 0.02153 | | | 4.03 Nlocal: 32000 ave 32000 max 32000 min Histogram: 1 0 0 0 0 0 0 0 0 0 Nghost: 5463 ave 5463 max 5463 min Histogram: 1 0 0 0 0 0 0 0 0 0 Neighs: 115133 ave 115133 max 115133 min Histogram: 1 0 0 0 0 0 0 0 0 0 Total # of neighbors = 115133 Ave neighs/atom = 3.59791 Neighbor list builds = 2 Dangerous builds = 0 Total wall time: 0:00:00