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Explosion in a Box - Variation of GuC-Factor (situation at time t=0.5)

Problem description       Results:   2 Levels        3 Levels       Variation of Distribution     Variation of GuC-Factor
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The Grid-Unit-Coarsening-Factor defines the minimal size of a unit of the base grid that is used for partitioning. For instance, a GuC-Factor =4 means, that units of 4x4 base cells are used. Higher GuC-Factors simplify partitioning, but usually lead to load-imbalance. If a relatively fine base grid is used, larger GuC-Factors can speed up the partitioner drastically (see example Backward facing step). The default value is 2.


Workload for different GuC-factors - Distribution with Hilbert space filling curve. 4 computing nodes are used.

GuC-Factor
P1
P2
P3
P4
2
0.932
1.062
1.044
0.962
4
0.914
1.097
1.057
0.931
8
0.778
1.433
0.843
0.946


 
      GuC-Factor=2
    		       GuC-Factor=4
      GuC-Factor=8


Benchmark

Task
GuC-Factor=2
GuC-Factor=4
GuC-Factor=8
s
%
s
%
s
%
Integration
 2246
 67.2
 2182
   65.8
 2163
   60.2
Flux correction
  180
  5.4
  201
    6.1
  275
    7.6
Boundary setting
  315
  9.4
  386
   11.6
  636
   17.7
Recomposition
  496
 14.9
  453
   13.7
  426
   11.8
Clustering
   37
  1.1
   34
    1.0
   32
    0.9
Misc.
   56
  2.0
   52
    1.9
   52
    1.7
Total / Parallel Efficiency
 3329
 85.1
 3307
 85.7
 3733
 75.9

P=4

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last update: 6/1/04