Specialize Copy/CopySubRange for TBB. (!931) · Merge requests · VTK / VTK-m · GitLab

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Allison Vacanti requested to merge allisonvacanti/vtk-m:173_tbb_copy into master Sep 15, 2017

Scaling isn't great on 4 cores + HT (except for UInt8 for some reason, which scales amazingly well), but there is an improvement over the old implementation (including UInt8, which sees performance double).

Speedup	Warn	serial	parallel	Benchmark (Type)
1.103	!!!	0.001691 +- 0.000115	0.001533 +- 0.000070	Copy 2097152 values (vtkm::Float32)
1.116	!!!	0.003537 +- 0.000401	0.003169 +- 0.000135	Copy 2097152 values (vtkm::Float64)
1.057	!!!	0.001631 +- 0.000112	0.001542 +- 0.000087	Copy 2097152 values (vtkm::Int32)
1.079	!!!	0.003488 +- 0.000200	0.003231 +- 0.000143	Copy 2097152 values (vtkm::Int64)
1.045	!!!	0.001635 +- 0.000111	0.001565 +- 0.000094	Copy 2097152 values (vtkm::UInt32)
7.990		0.002501 +- 0.000186	0.000313 +- 0.000022	Copy 2097152 values (vtkm::UInt8)
1.113	!!!	0.006937 +- 0.000569	0.006232 +- 0.000153	Copy 2097152 values (vtkm::Vec< vtkm::Float32, 4 >)
1.143	!!!	0.010736 +- 0.001137	0.009390 +- 0.000203	Copy 2097152 values (vtkm::Vec< vtkm::Float64, 3 >)
1.035	!!!	0.003322 +- 0.000200	0.003210 +- 0.000140	Copy 2097152 values (vtkm::Vec< vtkm::Int32, 2 >)
1.080	!!!	0.001662 +- 0.000090	0.001539 +- 0.000077	Copy 2097152 values (vtkm::Vec< vtkm::UInt8, 4 >)