Tree Poisson solver

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Flash 3, BES: speedup speedup (64 x t 64 /t) 700 600 500 400 300 200 100 90 80 70 60 50 hydro multigrid tree, θ lim = 0.5 tree, θ lim = 1.0 64 128 256 512 Number of CPUs Richard Wünsch, Flash workshop at the Hamburg Observatory, 15th February 2012 22/26
Flash 3: time(number of blocks) seconds per time-step 1000 100 10 1 0.1 0.01 64 CPUs, lrefine_min = lrefine_max, ilist=1 hydro tree, θ lim = 1.0 N log(N) N 0.001 64 512 4096 32768 Number of blocks Richard Wünsch, Flash workshop at the Hamburg Observatory, 15th February 2012 23/26
Page 1 and 2: Tree-based self-gravity solver R. W
Page 3 and 4: Communication of grid properties
Page 5 and 6: • for 8 × 8 × 8 blocks: Block t
Page 7 and 8: • 5 types of iteractions: 1. cell
Page 9 and 10: Test: Bonnor-Ebert sphere • mass:
Page 11 and 12: Flash 3: error in Φ (lref min = lr
Page 13 and 14: Flash 3: error in F r (lref min = l
Page 15 and 16: Flash 3: error in F r (lref min = 1
Page 17 and 18: Flash 2: error in F r (lref min = 1
Page 19 and 20: Flash 3, BES: relative time 1 other
Page 21: Flash 2, shell: time(nCPUs) 70,000
Page 25 and 26: GPU version • tree walk ported to
Page 27: Download at: http://galaxy.asu.cas.

Tree Poisson solver

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