SPARTA (23 Dec 2017) # advect particles via free molecular flow on a uniform grid # particles reflect off global box boundaries variable x index 10 variable y index 10 variable z index 10 variable lx equal $x*1.0e-5 variable lx equal 128*1.0e-5 variable ly equal $y*1.0e-5 variable ly equal 80*1.0e-5 variable lz equal $z*1.0e-5 variable lz equal 80*1.0e-5 variable n equal 10*$x*$y*$z variable n equal 10*128*$y*$z variable n equal 10*128*80*$z variable n equal 10*128*80*80 seed 12345 dimension 3 global gridcut 1.0e-5 boundary rr rr rr create_box 0 ${lx} 0 ${ly} 0 ${lz} create_box 0 0.00128 0 ${ly} 0 ${lz} create_box 0 0.00128 0 0.0008 0 ${lz} create_box 0 0.00128 0 0.0008 0 0.0008 Created orthogonal box = (0 0 0) to (0.00128 0.0008 0.0008) create_grid $x $y $z create_grid 128 $y $z create_grid 128 80 $z create_grid 128 80 80 WARNING: Could not acquire nearby ghost cells b/c grid partition is not clumped (../grid.cpp:381) Created 819200 child grid cells parent cells = 1 CPU time = 0.0295031 secs create/ghost percent = 42.27 57.73 balance_grid rcb part Balance grid migrated 818280 cells CPU time = 0.368648 secs reassign/sort/migrate/ghost percent = 80.5769 0.0377048 8.81329 10.5721 species ar.species Ar mixture air Ar vstream 0.0 0.0 0.0 temp 273.15 global nrho 7.07043E22 global fnum 7.07043E6 create_particles air n $n create_particles air n 8192000 Created 8192000 particles CPU time = 0.016037 secs stats 100 compute temp temp stats_style step cpu np nattempt ncoll c_temp # equilibrate with large timestep to unsort particles # then benchmark with normal timestep timestep 7.00E-8 run 30 Memory usage per proc in Mbytes: particles (ave,min,max) = 1.6875 1.6875 1.6875 grid (ave,min,max) = 1.51388 1.51388 1.51388 surf (ave,min,max) = 0 0 0 total (ave,min,max) = 3.20138 3.20138 3.20138 Step CPU Np Natt Ncoll c_temp 0 0 8192000 0 0 273.20841 30 0.40395379 8192000 0 0 273.20841 Loop time of 0.404128 on 1024 procs for 30 steps with 8192000 particles Particle moves = 245760000 (246M) Cells touched = 1221147106 (1.22B) Particle comms = 86483587 (86.5M) Boundary collides = 10747126 (10.7M) Boundary exits = 0 (0K) SurfColl checks = 0 (0K) SurfColl occurs = 0 (0K) Surf reactions = 0 (0K) Collide attempts = 0 (0K) Collide occurs = 0 (0K) Reactions = 0 (0K) Particles stuck = 0 Particle-moves/CPUsec/proc: 593871 Particle-moves/step: 8.192e+06 Cell-touches/particle/step: 4.96886 Particle comm iterations/step: 3.83333 Particle fraction communicated: 0.351903 Particle fraction colliding with boundary: 0.0437302 Particle fraction exiting boundary: 0 Surface-checks/particle/step: 0 Surface-collisions/particle/step: 0 Surf-reactions/particle/step: 0 Collision-attempts/particle/step: 0 Collisions/particle/step: 0 Reactions/particle/step: 0 Move time (%) = 0.259532 (64.2202) Coll time (%) = 0 (0) Sort time (%) = 0 (0) Comm time (%) = 0.143727 (35.5648) Modfy time (%) = 0 (0) Outpt time (%) = 0.000742621 (0.183759) Other time (%) = 0.000126316 (0.0312563) Particles: 8000 ave 8286 max 7696 min Histogram: 3 15 70 140 264 226 174 90 33 9 Cells: 800 ave 800 max 800 min Histogram: 1024 0 0 0 0 0 0 0 0 0 GhostCell: 1290.78 ave 1552 max 640 min Histogram: 8 12 42 56 93 50 283 25 130 325 EmptyCell: 632.784 ave 912 max 0 min Histogram: 1 11 10 49 124 93 246 138 192 160 timestep 7.00E-9 run $t run 100 Memory usage per proc in Mbytes: particles (ave,min,max) = 1.6875 1.6875 1.6875 grid (ave,min,max) = 1.51388 1.51388 1.51388 surf (ave,min,max) = 0 0 0 total (ave,min,max) = 3.20138 3.20138 3.20138 Step CPU Np Natt Ncoll c_temp 30 0 8192000 0 0 273.20841 100 0.18394709 8192000 0 0 273.20841 130 0.26232004 8192000 0 0 273.20841 Loop time of 0.262513 on 1024 procs for 100 steps with 8192000 particles Particle moves = 819200000 (819M) Cells touched = 1143018746 (1.14B) Particle comms = 31480212 (31.5M) Boundary collides = 3578620 (3.58M) Boundary exits = 0 (0K) SurfColl checks = 0 (0K) SurfColl occurs = 0 (0K) Surf reactions = 0 (0K) Collide attempts = 0 (0K) Collide occurs = 0 (0K) Reactions = 0 (0K) Particles stuck = 0 Particle-moves/CPUsec/proc: 3.04747e+06 Particle-moves/step: 8.192e+06 Cell-touches/particle/step: 1.39529 Particle comm iterations/step: 1 Particle fraction communicated: 0.038428 Particle fraction colliding with boundary: 0.00436843 Particle fraction exiting boundary: 0 Surface-checks/particle/step: 0 Surface-collisions/particle/step: 0 Surf-reactions/particle/step: 0 Collision-attempts/particle/step: 0 Collisions/particle/step: 0 Reactions/particle/step: 0 Move time (%) = 0.177874 (67.7582) Coll time (%) = 0 (0) Sort time (%) = 0 (0) Comm time (%) = 0.0827971 (31.5402) Modfy time (%) = 0 (0) Outpt time (%) = 0.00156433 (0.595907) Other time (%) = 0.000277504 (0.105711) Particles: 8000 ave 8232 max 7717 min Histogram: 2 22 56 117 201 220 220 97 68 21 Cells: 800 ave 800 max 800 min Histogram: 1024 0 0 0 0 0 0 0 0 0 GhostCell: 1290.78 ave 1552 max 640 min Histogram: 8 12 42 56 93 50 283 25 130 325 EmptyCell: 632.784 ave 912 max 0 min Histogram: 1 11 10 49 124 93 246 138 192 160