Stephen Adams a4294c354c Benchmark for comparing reading Uint8List vs UnmodifiableUint8ListView ... The benchmark reports per-element times for summing the elements of a typed-data List. ---- The VM implementation is quite good but it looks like there is still a little room for improvement since the views are 2x slower than a simple array. dart compile exe: TypedDataPoly.mono.array.2(RunTime): 1.9670880036279512 ns. TypedDataPoly.A_V.array.2(RunTime): 4.392355 ns. TypedDataPoly.A_V.view.2(RunTime): 5.730097499999999 ns. TypedDataPoly.A_UV.array.2(RunTime): 4.455393750000001 ns. TypedDataPoly.A_UV.view.2(RunTime): 5.811122500000001 ns. TypedDataPoly.A_VUV.array.2(RunTime): 4.386336250000001 ns. TypedDataPoly.A_VUV.view.2(RunTime): 5.7639675 ns. TypedDataPoly.A_UVx5.array.2(RunTime): 4.62768 ns. TypedDataPoly.A_UVx5.view.2(RunTime): 5.7099649999999995 ns. TypedDataPoly.mega.array.2(RunTime): 5.272632499999999 ns. TypedDataPoly.mega.mixed.2(RunTime): 5.62861 ns. TypedDataPoly.mono.array.100(RunTime): 0.6455633088733822 ns. TypedDataPoly.A_V.array.100(RunTime): 3.1558100965636964 ns. TypedDataPoly.A_V.view.100(RunTime): 4.476973567105732 ns. TypedDataPoly.A_UV.array.100(RunTime): 3.149724878714137 ns. TypedDataPoly.A_UV.view.100(RunTime): 4.500062299750802 ns. TypedDataPoly.A_VUV.array.100(RunTime): 3.1438380581862146 ns. TypedDataPoly.A_VUV.view.100(RunTime): 4.499246259421757 ns. TypedDataPoly.A_UVx5.array.100(RunTime): 3.1570175999999996 ns. TypedDataPoly.A_UVx5.view.100(RunTime): 4.482889818440727 ns. TypedDataPoly.mega.array.100(RunTime): 3.649420567570034 ns. TypedDataPoly.mega.mixed.100(RunTime): 4.068594455581881 ns. On the other hand, there is a massive performance tax for using UnmodifiableUint8ListView on the web, especially views of views. https://github.com/dart-lang/sdk/issues/50255 discusses how this might be fixed. compile js -O3: TypedDataPoly.mono.array.2(RunTime): 2.209502118308509 ns. TypedDataPoly.A_V.array.2(RunTime): 2.58625 ns. TypedDataPoly.A_V.view.2(RunTime): 2.32 ns. TypedDataPoly.A_UV.array.2(RunTime): 51.633530557495135 ns. TypedDataPoly.A_UV.view.2(RunTime): 302.4986387561256 ns. TypedDataPoly.A_VUV.array.2(RunTime): 52.19476512355694 ns. TypedDataPoly.A_VUV.view.2(RunTime): 302.84394312113756 ns. TypedDataPoly.A_UVx5.array.2(RunTime): 55.649763488505165 ns. TypedDataPoly.A_UVx5.view.2(RunTime): 849.458699173131 ns. TypedDataPoly.mega.array.2(RunTime): 59.75952192382461 ns. TypedDataPoly.mega.mixed.2(RunTime): 142.7126082991336 ns. TypedDataPoly.mono.array.100(RunTime): 0.9815000000000002 ns. TypedDataPoly.A_V.array.100(RunTime): 1.1626947678735444 ns. TypedDataPoly.A_V.view.100(RunTime): 1.2075 ns. TypedDataPoly.A_UV.array.100(RunTime): 17.17602868362643 ns. TypedDataPoly.A_UV.view.100(RunTime): 231.5 ns. TypedDataPoly.A_VUV.array.100(RunTime): 16.85678073510773 ns. TypedDataPoly.A_VUV.view.100(RunTime): 229.7 ns. TypedDataPoly.A_UVx5.array.100(RunTime): 17.01657458563536 ns. TypedDataPoly.A_UVx5.view.100(RunTime): 697.5524475524476 ns. TypedDataPoly.mega.array.100(RunTime): 22.770700636942674 ns. TypedDataPoly.mega.mixed.100(RunTime): 94.4 ns. Change-Id: If8878efd4c57bbd87effcd1d3f1339bc0cffbd75 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/264897 Commit-Queue: Stephen Adams <sra@google.com> Reviewed-by: Sigmund Cherem <sigmund@google.com>		2022-10-21 00:53:59 +00:00
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TypedDataPoly.dart	Benchmark for comparing reading Uint8List vs UnmodifiableUint8ListView	2022-10-21 00:53:59 +00:00