dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 20 Regressions on 8/3/2026 7:26:34 AM +00:00

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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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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [79efd2de59f086171fd811d7375241616c43b890](https://github.com/dotnet/runtime/commit/79efd2de59f086171fd811d7375241616c43b890)
Compare | [c4fc2a5afc5644e10973054b1aa63c27a1584404](https://github.com/dotnet/runtime/commit/c4fc2a5afc5644e10973054b1aa63c27a1584404)
Diff | [Diff](https://github.com/dotnet/runtime/compare/79efd2de59f086171fd811d7375241616c43b890...c4fc2a5afc5644e10973054b1aa63c27a1584404)
Configs | CompilationMode:wasm, RunKind:micro

### Regressions in System.MathBenchmarks.Double

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

  • [Atan - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 59.93 μs | 97.44 μs | 1.63 | 0.12 | False | | |
|
  • [Exp - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 45.85 μs | 73.05 μs | 1.59 | 0.08 | False | | |
|
  • [Pow - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 90.20 μs | 142.30 μs | 1.58 | 0.04 | False | | |
|
  • [Cbrt - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 57.71 μs | 84.22 μs | 1.46 | 0.00 | False | | |
|
  • [Log10P1 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 103.81 μs | 142.86 μs | 1.38 | 0.33 | False | | |
|
  • [Atan2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 90.48 μs | 118.89 μs | 1.31 | 0.12 | False | | |
|
  • [Exp10 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 90.34 μs | 117.90 μs | 1.31 | 0.08 | False | | |
|
  • [Acos - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 70.57 μs | 88.69 μs | 1.26 | 0.13 | False | | |
|
  • [Exp2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 94.90 μs | 118.92 μs | 1.25 | 0.11 | False | | |
|
  • [Log2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 43.22 μs | 53.22 μs | 1.23 | 0.04 | False | | |
|
  • [AtanPi - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 71.36 μs | 87.06 μs | 1.22 | 0.19 | False | | |
|
  • [Sin - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 46.51 μs | 52.29 μs | 1.12 | 0.13 | False | | |

![graph]()
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![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.MathBenchmarks.Double*'
```

### System.MathBenchmarks.Double.Atan

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Exp

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Pow

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Cbrt

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Log10P1

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Atan2

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Exp10

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Acos

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Exp2

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Log2

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.AtanPi

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Sin

#### 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

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [79efd2de59f086171fd811d7375241616c43b890](https://github.com/dotnet/runtime/commit/79efd2de59f086171fd811d7375241616c43b890)
Compare | [c4fc2a5afc5644e10973054b1aa63c27a1584404](https://github.com/dotnet/runtime/commit/c4fc2a5afc5644e10973054b1aa63c27a1584404)
Diff | [Diff](https://github.com/dotnet/runtime/compare/79efd2de59f086171fd811d7375241616c43b890...c4fc2a5afc5644e10973054b1aa63c27a1584404)
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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [Exp - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 36.78 μs | 73.30 μs | 1.99 | 0.10 | False | | |
|
  • [LogP1 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 58.89 μs | 98.67 μs | 1.68 | 0.44 | False | | |
|
  • [Atanh - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 66.05 μs | 103.54 μs | 1.57 | 0.02 | False | | |
|
  • [Atan2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 72.97 μs | 106.66 μs | 1.46 | 0.08 | False | | |
|
  • [AcosPi - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 55.39 μs | 76.33 μs | 1.38 | 0.02 | False | | |
|
  • [Cos - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 38.51 μs | 52.16 μs | 1.35 | 0.25 | False | | |
|
  • [Pow - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 64.59 μs | 83.59 μs | 1.29 | 0.09 | False | | |
|
  • [Tan - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 41.71 μs | 47.29 μs | 1.13 | 0.12 | False | | |

![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.MathBenchmarks.Single*'
```

### System.MathBenchmarks.Single.Exp

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.LogP1

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Atanh

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Atan2

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.AcosPi

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Cos

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Pow

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Tan

#### 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)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the linked performance reports and the baseline-to-compare commit diff, then inspect the benchmark sources under src/benchmarks/micro/runtime/Math/Functions/Double/, including Atan.cs, Exp.cs, Pow.cs, Cbrt.cs, and related files. Run the affected System.MathBenchmarks.Double WASM microbenchmarks on Ubuntu 22.04 and determine the cause of the reported regressions; done means the regression is explained and the affected results are restored or triaged.

Written by the indexing model from the issue text.

Assessment

Tech stack
ubuntu, wasm
Domain
performance
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
25/100

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