2D Euler equations - Backward facing step

3 Grid Levels (density at time t = 0.75)

Results: 2 Levels / 3 Levels

Contour lines of density on refinement grids (P=1)

	Level 0	Level 1	Level 2
Grids	2	48	111
Cells	67500	25792	187248

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Benchmark

Task	P=1		P=2, GuC-Factor=2		P=4, GuC-Factor=2		P=2, GuC-Factor=1		P=4, GuC-Factor=1
	s	%	s	%	s	%	s	%	s	%
Integration	3930	73.1	1848	62.0	930	53.5	2077	43.6	1045	38.3
Flux correction	95	1.8	66	2.2	63	3.6	91	1.9	78	2.9
Boundary setting	657	12.2	660	22.1	463	26.7	704	14.8	458	16.8
Recomposition	271	5.0	231	7.7	176	10.1	1685	35.4	1015	37.2
Clustering	177	3.3	67	2.2	35	2.0	69	1.4	36	1.3
Misc.	243	4.5	110	3.7	70	4.0	131	3.0	85	3.5
Total / Parallel Efficiency	5373	100.0	2982	90.1	1737	77.3	4756	56.5	2717	49.4

If a relatively fine base grid is used, the choice of a larger GuC-Factor can decrease the overhead for partitioning and recomposition significantly. In this example, the partitioner can use up to 67500 units for GuC-Factor=1, while for GuC-Factor=2 only up to 16875 units are allowed.

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-- RalfDeiterding - 04 Dec 2004