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) 2 by 1 by 2 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 = 7.04927 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 0.171815 on 4 procs for 100 steps with 32000 atoms Performance: 5028.653 tau/day, 582.020 timesteps/s 99.7% CPU use with 4 MPI tasks x no OpenMP threads MPI task timing breakdown: Section | min time | avg time | max time |%varavg| %total --------------------------------------------------------------- Pair | 0.093691 | 0.096898 | 0.10005 | 0.8 | 56.40 Neigh | 0.011976 | 0.012059 | 0.012146 | 0.1 | 7.02 Comm | 0.016384 | 0.017418 | 0.018465 | 0.8 | 10.14 Output | 7.7963e-05 | 0.00010747 | 0.00013304 | 0.2 | 0.06 Modify | 0.031744 | 0.031943 | 0.032167 | 0.1 | 18.59 Other | | 0.01339 | | | 7.79 Nlocal: 8000 ave 8008 max 7992 min Histogram: 2 0 0 0 0 0 0 0 0 2 Nghost: 2439 ave 2450 max 2428 min Histogram: 2 0 0 0 0 0 0 0 0 2 Neighs: 29500.5 ave 30488 max 28513 min Histogram: 2 0 0 0 0 0 0 0 0 2 Total # of neighbors = 118002 Ave neighs/atom = 3.68756 Neighbor list builds = 2 Dangerous builds = 0 Total wall time: 0:00:00