dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 112 Regressions on 8/25/2026 10:44:15 PM +00:00

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arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro os-linux perf-regression runkind-micro runtimetype-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [df846d69e1666f9c6060f2487975b568f3ed93bb](https://github.com/dotnet/runtime/commit/df846d69e1666f9c6060f2487975b568f3ed93bb)
Compare | [9f18a550aaa91ecd032ac024b67e03559df9e766](https://github.com/dotnet/runtime/commit/9f18a550aaa91ecd032ac024b67e03559df9e766)
Diff | [Diff](https://github.com/dotnet/runtime/compare/df846d69e1666f9c6060f2487975b568f3ed93bb...9f18a550aaa91ecd032ac024b67e03559df9e766)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Tests.Perf_Double

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 12.96 μs | 17.22 μs | 1.33 | 0.26 | False | | |
|
  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 13.30 μs | 17.48 μs | 1.31 | 0.23 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.81 μs | 24.02 μs | 1.28 | 0.27 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 22.61 μs | 28.73 μs | 1.27 | 0.19 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 23.76 μs | 29.89 μs | 1.26 | 0.21 | False | | |
|
  • [ToStringWithCultureInfo - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 25.47 μs | 31.25 μs | 1.23 | 0.18 | False | | |
|
  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 13.81 μs | 16.88 μs | 1.22 | 0.24 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 26.33 μs | 32.16 μs | 1.22 | 0.20 | False | | |
|
  • [ToString - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 26.78 μs | 32.69 μs | 1.22 | 0.20 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 26.81 μs | 32.43 μs | 1.21 | 0.15 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.65 μs | 22.53 μs | 1.21 | 0.21 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 27.38 μs | 33.01 μs | 1.21 | 0.19 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 13.56 μs | 16.26 μs | 1.20 | 0.27 | False | | |
|
  • [ToString - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 27.28 μs | 32.60 μs | 1.20 | 0.15 | False | | |
|
  • [Parse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.37 μs | 9.92 μs | 1.19 | 0.16 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 28.66 μs | 33.19 μs | 1.16 | 0.23 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 19.18 μs | 21.74 μs | 1.13 | 0.22 | False | | |
|
  • [ToStringWithCultureInfo - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 28.17 μs | 31.76 μs | 1.13 | 0.19 | False | | |
|
  • [TryParse - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.37 μs | 9.39 μs | 1.12 | 0.19 | False | | |
|
  • [ToStringWithFormat - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.21 μs | 16.72 μs | 1.10 | 0.19 | False | | |

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[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Tests.Perf_Double*'
```

### System.Tests.Perf_Double.TryParse(value: "-1.7976931348623157e+308")

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### System.Tests.Perf_Double.Parse(value: "-1.7976931348623157e+308")

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### System.Tests.Perf_Double.ToStringWithFormat(value: -1.7976931348623157E+308, format: "E")

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### System.Tests.Perf_Double.ToStringWithFormat(value: -1.7976931348623157E+308, format: "G17")

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### System.Tests.Perf_Double.ToStringWithFormat(value: 1.7976931348623157E+308, format: "G17")

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### System.Tests.Perf_Double.ToStringWithCultureInfo(value: 1.7976931348623157E+308, culture: zh)

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### System.Tests.Perf_Double.Parse(value: "1.7976931348623157e+308")

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### System.Tests.Perf_Double.ToStringWithFormat(value: 1.7976931348623157E+308, format: "G")

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### System.Tests.Perf_Double.ToString(value: 1.7976931348623157E+308)

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### System.Tests.Perf_Double.ToStringWithFormat(value: -1.7976931348623157E+308, format: "G")

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### System.Tests.Perf_Double.ToStringWithFormat(value: 1.7976931348623157E+308, format: "E")

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### System.Tests.Perf_Double.ToStringWithFormat(value: 1.7976931348623157E+308, format: "R")

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### System.Tests.Perf_Double.TryParse(value: "1.7976931348623157e+308")

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### System.Tests.Perf_Double.ToString(value: -1.7976931348623157E+308)

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### System.Tests.Perf_Double.Parse(value: "12345")

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### System.Tests.Perf_Double.ToStringWithFormat(value: -1.7976931348623157E+308, format: "R")

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### System.Tests.Perf_Double.ToStringWithFormat(value: 12345, format: "E")

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### System.Tests.Perf_Double.ToStringWithCultureInfo(value: -1.7976931348623157E+308, culture: zh)

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### System.Tests.Perf_Double.TryParse(value: "12345")

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### System.Tests.Perf_Double.ToStringWithFormat(value: 12345, format: "G")

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### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

---

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [8baacb006f5615ebd705bdf9de98ca5df7bf1ba1](https://github.com/dotnet/runtime/commit/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1)
Compare | [9f18a550aaa91ecd032ac024b67e03559df9e766](https://github.com/dotnet/runtime/commit/9f18a550aaa91ecd032ac024b67e03559df9e766)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8baacb006f5615ebd705bdf9de98ca5df7bf1ba1...9f18a550aaa91ecd032ac024b67e03559df9e766)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Buffers.Text.Tests.Utf8FormatterTests

Benchmark | Baseline | Test | Test/Base | Test Quality | Edge Detector | Baseline IR | Compare IR | IR Ratio
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [FormatterDateTimeOffsetNow - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 4.01 μs | 16.94 μs | 4.23 | 0.11 | False | | |
|
  • [FormatterUInt64 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.08 μs | 18.54 μs | 3.05 | 0.18 | False | | |
|
  • [FormatterInt64 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.26 μs | 19.05 μs | 3.04 | 0.20 | False | | |
|
  • [FormatterInt64 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.67 μs | 17.16 μs | 3.03 | 0.18 | False | | |
|
  • [FormatterUInt32 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.70 μs | 10.80 μs | 2.92 | 0.18 | False | | |
|
  • [FormatterInt32 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.69 μs | 10.67 μs | 2.89 | 0.16 | False | | |
|
  • [FormatterDecimal - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.42 μs | 38.23 μs | 2.19 | 0.21 | False | | |
|
  • [FormatterUInt64 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.89 μs | 5.97 μs | 2.06 | 0.12 | False | | |
|
  • [FormatterUInt32 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.75 μs | 5.57 μs | 2.03 | 0.12 | False | | |
|
  • [FormatterInt32 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.79 μs | 5.62 μs | 2.02 | 0.16 | False | | |
|
  • [FormatterInt64 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.94 μs | 5.90 μs | 2.00 | 0.15 | False | | |
|
  • [FormatterDouble - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 26.33 μs | 32.67 μs | 1.24 | 0.26 | False | | |
|
  • [FormatterDouble - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 26.08 μs | 29.53 μs | 1.13 | 0.22 | False | | |

![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
![graph]()
[Test Report]()

### Repro
General Docs link: https://github.com/dotnet/performance/blob/main/docs/benchmarking-workflow-dotnet-runtime.md

```cmd
git clone https://github.com/dotnet/performance.git
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Text.Tests.Utf8FormatterTests*'
```

### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterDateTimeOffsetNow(value: 12/30/2017 3:45:22 AM -08:00)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterUInt64(value: 18446744073709551615)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterInt64(value: -9223372036854775808)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterInt64(value: 9223372036854775807)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterUInt32(value: 4294967295)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterInt32(value: 2147483647)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterDecimal(value: 123456.78900000000430736690760)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterUInt64(value: 12345)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterUInt32(value: 12345)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterInt32(value: 12345)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterInt64(value: 12345)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterDouble(value: -1.7976931348623157E+308)

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### System.Buffers.Text.Tests.Utf8FormatterTests.FormatterDouble(value: 1.7976931348623157E+308)

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### Docs

[Profiling workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/profiling-workflow-dotnet-runtime.md)
[Benchmarking workflow for dotnet/runtime repository](https://github.com/dotnet/performance/blob/master/docs/benchmarking-workflow-dotnet-runtime.md)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the listed regression reports and the benchmark source in dotnet/performance/src/benchmarks/micro/libraries/System.Runtime/Perf.Double.cs, especially lines 56-79. Reproduce the affected Parse, TryParse, and ToStringWithFormat cases under the wasm microbenchmark configuration, comparing the baseline and compare commits. Done means the regression cause is identified and the affected benchmarks are restored or the result is explained.

Written by the indexing model from the issue text.

Assessment

Tech stack
linux, ubuntu, wasm
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
35/100

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