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[perf] System.Memory.Span.** and System.Memory.ReadOnly.** performance regressions in Mono AOT x64 microbenchmarks from Preview 5 to Preview 7 #89247
Description
Description
The following performance regressions occurred between the Preview 4 snapshot (May 2nd, 2023) and Preview 7 snapshot (July 19th, 2023).
The configuration used for the benchmarks is Mono AOT with LLVM on x64 ubuntu 18.04.
| Name | Baseline Value | Compare Value | % Difference |
|---|---|---|---|
| System.Net.Tests.Perf_WebUtility.HtmlDecode_Entities | 793.41 | 1068.41 | 34.66 |
| System.Memory.Span<Int32>.LastIndexOfValue(Size: 4) | 10.6 | 30.11 | 184.06 |
| System.Memory.Span<Int32>.IndexOfValue(Size: 512) | 186.47 | 610.48 | 227.39 |
| System.Memory.Span<Int32>.IndexOfValue(Size: 4) | 11.31 | 40.59 | 258.89 |
| System.Memory.Span<Int32>.BinarySearch(Size: 4) | 20.89 | 21.95 | 5.07 |
| System.Memory.Span<Char>.SequenceEqual(Size: 4) | 23.92 | 33.69 | 40.84 |
| System.Memory.Span<Char>.Reverse(Size: 4) | 11.19 | 14.47 | 29.31 |
| System.Memory.Span<Char>.LastIndexOfValue(Size: 4) | 10.6 | 12.61 | 18.96 |
| System.Memory.Span<Char>.IndexOfValue(Size: 512) | 186.48 | 340.74 | 82.72 |
| System.Memory.Span<Char>.IndexOfValue(Size: 33) | 20.49 | 65.79 | 221.08 |
| System.Memory.Span<Char>.IndexOfAnyFourValues(Size: 4) | 28.18 | 39.38 | 39.74 |
| System.Memory.Span<Byte>.Reverse(Size: 4) | 23.92 | 27.06 | 13.13 |
| System.Memory.Span<Byte>.LastIndexOfAnyValues(Size: 4) | 12.2 | 19.55 | 60.25 |
| System.Memory.Span<Byte>.IndexOfAnyTwoValues(Size: 4) | 13.28 | 20.79 | 56.55 |
| System.Memory.Span<Byte>.IndexOfAnyFourValues(Size: 4) | 29.86 | 38.39 | 28.57 |
| System.Memory.ReadOnlySpan.IndexOfString(input: だだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだxだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだ, value: x, comparisonType: Ordinal) | 359.55 | 615.97 | 71.32 |
| System.Memory.ReadOnlySpan.IndexOfString(input: だだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだすだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだだ, value: す, comparisonType: Ordinal) | 46.6 | 112.47 | 141.35 |
| System.Memory.ReadOnlySpan.IndexOfString(input: Hello Worldbbbbbbbbbbbbbbcbbbbbbbbbbbbbbbbbbba!, value: y, comparisonType: Ordinal) | 44.77 | 81.37 | 81.75 |
| System.Memory.ReadOnlySpan.IndexOfString(input: Hello WorldbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbareallyreallylongHello WorldbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbareallyreallylongHello Worldbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbareallyreallylong!xyz, value: ~, comparisonType: Ordinal) | 143.47 | 237.72 | 65.69 |
| System.Memory.ReadOnlySequence.Slice_Start(Segment: Single) | 10.32 | 12.79 | 23.93 |
Activity
kotlarmilos commentedon Jul 20, 2023
@EgorBo @MihaZupan We are trying to narrow down changes between May 2nd, 2023 and July 19th, 2023 that may have caused the regressions. If you are aware of any changes that might have potentially caused these regressions, please let us know.
/cc: @vargaz
MihaZupan commentedon Jul 20, 2023
@kotlarmilos possibly #88101 or #86655 if the extra code affects Mono codegen somehow.
In case Mono cares about
AggressiveOptimization, #85819 removed that from a few of these.