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Simulations, Data Analysis and Algorithms

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Table 1 Parameters and some runtime statistics for the 1,024 task runs of the experiment

From: PHEW: a parallel segmentation algorithm for three-dimensional AMR datasets

\(N_{\mathrm{parts}}\) 5123 1,0243
\(N_{\mathrm{tasks}}\) 1,024 1,024
Density threshold \(80 \rho_{\mathrm{crit}}\) \(80 \rho_{\mathrm{crit}}\)
Relevance threshold 3 3
Saddle threshold \(200 \rho_{\mathrm{crit}}\) \(200 \rho_{\mathrm{crit}}\)
Number of test cells 104,360,968 835,609,288
Number of density peaks 6,714,764 53,994,995
Number of relevant clumps 1,311,208 10,612,079
Number of haloes* 521,185 4,234,746
Runtime 8.0 s 38.9 s
Number of iterations for…   
…watershed segmentation 7 9
…noise removal   
Level 1 7 7
Level 2 5 6
Level 3 4 4
Level 4 2 3
Level 5 1 2
Level 6 1 1
Level 7 1 1
Level 8   1
…substructure merging   
Level 1 4 3
Level 2 3 4
Level 3 3 3
Level 4 2 2
Level 5 1 2
Level 6 1 1
Level 7   1
  1. *Note that we do only count the objects that contain more than 10 dark matter particles.
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