2D Euler equations - Backward facing step

2 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
Grids	2	52
Cells	67500	22556

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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	332	58.8	170	41.8	81	33.1	218	23.9	104	22.0
Flux correction	41	7.3	27	6.6	15	6.1	31	3.4	19	4.0
Boundary setting	23	4.1	97	23.8	70	28.6	93	10.2	62	13.2
Recomposition	27	4.1	97	23.8	70	28.6	483	53.0	227	48.1
Clustering	40	7.0	19	4.7	10	4.1	19	2.1	10	2.2
Misc.	102	18.0	44	10.8	30	12.2	58	7.4	40	10.5
Total / Parallel Efficiency	565	100.0	407	69.4	245	57.7	901	31.4	462	30.6

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