Skip to topic | Skip to bottom
Home

Start of topic | Skip to actions

2D Euler equations - Explosion in a Box

Variation of GuC-Factor (situation at time t=0.5)

Results: 2 Levels / 3 Levels / Variation of Distribution / Variation of GuC-Factor


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

box3_d1.gif


GuC-Factor=4

box3_guc4.gif


GuC-Factor=8

box3_guc8.gif




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


<--- Problem description



-- RalfDeiterding - 04 Dec 2004

You are here: Amroc > ClawpackHome > ClawpackExamples > ClawpackEuler2dBox > ClawpackEuler2dBoxGuC

to top

Copyright © 1997-2024 California Institute of Technology.