[Perf] Linux/x64: 13 Regressions on 6/25/2026 3:50:04 PM +00:00

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#75,292 opened on Jun 30, 2026 2 comments 0 reactions 0 assignees View on GitHub

arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro Look Again os-linux perf-regression runkind-micro untriaged

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Forks: 8
PR merge metrics: PR metrics pending

Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [818cfd5edcda78ac3eb201af392fd301ab9ad46b](https://github.com/dotnet/runtime/commit/818cfd5edcda78ac3eb201af392fd301ab9ad46b)
Compare | [4e28c96c3bd32ce2811ef7128641e8926874020e](https://github.com/dotnet/runtime/commit/4e28c96c3bd32ce2811ef7128641e8926874020e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/818cfd5edcda78ac3eb201af392fd301ab9ad46b...4e28c96c3bd32ce2811ef7128641e8926874020e)
Configs | CompilationMode:wasm, RunKind:micro

### Regressions in System.MathBenchmarks.Single

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

[Cbrt - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 40.53 μs | 62.48 μs | 1.54 | 0.04 | False | | |
|

[Acosh - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 56.05 μs | 81.04 μs | 1.45 | 0.02 | False | | |
|

[Asinh - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 81.15 μs | 108.71 μs | 1.34 | 0.09 | False | | |
|

[Atanh - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 61.17 μs | 66.07 μs | 1.08 | 0.01 | False | | |

![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.MathBenchmarks.Single*'
```

### System.MathBenchmarks.Single.Cbrt

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Acosh

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Asinh

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Atanh

#### ETL Files

#### Histogram

#### JIT Disasms

### 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

### Regressions in System.Threading.Tests.Perf_CancellationToken

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

[RegisterAndUnregister_Serial - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 236.41 ns | 305.32 ns | 1.29 | 0.23 | False | | |
|

[CreateLinkedTokenSource1 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 321.43 ns | 396.52 ns | 1.23 | 0.25 | False | | |
|

[CreateLinkedTokenSource2 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 594.16 ns | 707.94 ns | 1.19 | 0.22 | False | | |

![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.Threading.Tests.Perf_CancellationToken*'
```

### System.Threading.Tests.Perf_CancellationToken.RegisterAndUnregister_Serial

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tests.Perf_CancellationToken.CreateLinkedTokenSource1

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Threading.Tests.Perf_CancellationToken.CreateLinkedTokenSource2

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in Exceptions.Handling

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

[TryAndCatchDeep_CaugtAtTheTop - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 3.69 μs | 4.14 μs | 1.12 | 0.17 | False | | |
|

[TryAndCatchDeep_CaugtAtTheTop - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 3.05 μs | 3.31 μs | 1.09 | 0.18 | False | | |

![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 'Exceptions.Handling*'
```

### Exceptions.Handling.TryAndCatchDeep_CaugtAtTheTop(kind: Hardware)

#### ETL Files

#### Histogram

#### JIT Disasms

### Exceptions.Handling.TryAndCatchDeep_CaugtAtTheTop(kind: Software)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in PerfLabTests.StackWalk

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

[Walk - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 19.93 ms | 24.12 ms | 1.21 | 0.01 | False | | |

![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 'PerfLabTests.StackWalk*'
```

### PerfLabTests.StackWalk.Walk

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in SIMD.ConsoleMandel

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

[ScalarFloatSinglethreadRaw - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config 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 'SIMD.ConsoleMandel*'
```

### SIMD.ConsoleMandel.ScalarFloatSinglethreadRaw

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in System.Numerics.Tests.Perf_VectorOf<Byte>

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

[DotBenchmark - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 46.66 ns | 57.49 ns | 1.23 | 0.28 | False | | |

![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.Numerics.Tests.Perf_VectorOf*'
```

### System.Numerics.Tests.Perf_VectorOf<Byte>.DotBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in System.Numerics.Tests.Perf_VectorOf<SByte>

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

[DotBenchmark - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 50.86 ns | 56.43 ns | 1.11 | 0.20 | False | | |

![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.Numerics.Tests.Perf_VectorOf*'
```

### System.Numerics.Tests.Perf_VectorOf<SByte>.DotBenchmark

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

Contributor guide

No contributing guide indexed for this repository

Research direction

Start by reviewing the baseline and compare commits and run the documented benchmarks command for System.MathBenchmarks.Single. Inspect the linked benchmark sources, including src/benchmarks/micro/runtime/Math/Functions/Single and src/benchmarks/micro/libraries/System.Threading/Perf.CancellationToken.cs. Done means the reported regressions are investigated and the affected benchmark results are restored or their cause is documented.

Written by the indexing model from the issue text.

Assessment

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

[Perf] Linux/x64: 13 Regressions on 6/25/2026 3:50:04 PM +00:00

Description

Contributor guide

Research direction

Assessment

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