Performance regression: Utf8String.IsAscii (x86 only) #41388
Description
Repro
git clone https://github.com/dotnet/performance.git
py .\scripts\benchmarks_ci.py -f netcoreapp3.1 netcoreapp5.0 --filter System.Text.Perf_Utf8String.IsAscii --architecture x86@eiriktsarpalis @GrabYourPitchforks @carlossanlop @pgovind I am setting 5.0 milestone to make sure that it gets triaged within the next few weeks.
There was a similar issue, but I've verified that #41198 is not fixing this problem.
@GrabYourPitchforks @eerhardt The benchmark throws for all other documents for 3.1.6 which might be a bug in .NET Standard implementation of Utf8String:
System.Reflection.TargetInvocationException: Exception has been thrown by the target of an invocation.
---> System.ArgumentException: The input buffer contained ill-formed UTF-16 data. (Parameter 'value')
at System.Utf8String.InitializeBuffer(ReadOnlySpan`1 value)
at System.Utf8String..ctor(String value)
at System.Text.Perf_Utf8String.Setup() in C:\Projects\performance\src\benchmarks\micro\libraries\System.Utf8String\Perf.Utf8String.cs:line 21[2020/08/26 12:11:48][INFO]
System.Text.Perf_Utf8String.IsAscii(Input: EnglishAllAscii)
| Conclusion | Base | Diff | Base/Diff | Modality | Operating System | Bit | Processor Name | Base Runtime | Diff Runtime |
|---|---|---|---|---|---|---|---|---|---|
| Same | 21236.28 | 21117.76 | 1.01 | Windows 10.0.18363.1016 | Arm | Microsoft SQ1 3.0 GHz | .NET Core 3.1.6 | 5.0.100-rc.1.20418.3 | |
| Same | 3660.66 | 3453.20 | 1.06 | Windows 10.0.18363.959 | X64 | Intel Xeon CPU E5-1650 v4 3.60GHz | .NET Core 3.1.6 | 5.0.100-rc.1.20418.3 | |
| Faster | 3780.81 | 3095.66 | 1.22 | Windows 10.0.19041.450 | X64 | Intel Core i7-6700 CPU 3.40GHz (Skylake) | .NET Core 3.1.6 | 5.0.100-rc.1.20419.9 | |
| Slower | 3548.77 | 7006.60 | 0.51 | Windows 10.0.18363.959 | X86 | Intel Xeon CPU E5-1650 v4 3.60GHz | .NET Core 3.1.6 | 5.0.100-rc.1.20420.14 | |
| Slower | 4134.58 | 7835.15 | 0.53 | Windows 10.0.19041.450 | X86 | Intel Core i7-5557U CPU 3.10GHz (Broadwell) | .NET Core 3.1.6 | 5.0.100-rc.1.20419.5 | |
| Same | 30655.72 | 42199.20 | 0.73 | bimodal | ubuntu 18.04 | Arm64 | Unknown processor | .NET Core 3.1.6 | 6.0.100-alpha.1.20421.6 |
Docs
Profiling workflow for dotnet/runtime repository
Benchmarking workflow for dotnet/runtime repository
@DrewScoggins this regression did not get detected by the bot because benchmark was added just a few days ago, so everything is 👍