dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 23 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 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
-- | -- | -- | -- | -- | -- | -- | -- | --
|

  • [Exp - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 43.64 μs | 70.19 μs | 1.61 | 0.09 | False | | |
|
  • [Atan - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 61.27 μs | 97.98 μs | 1.60 | 0.12 | False | | |
|
  • [Asinh - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 82.37 μs | 130.56 μs | 1.59 | 0.06 | False | | |
|
  • [Pow - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 90.21 μs | 140.43 μs | 1.56 | 0.04 | False | | |
|
  • [Cbrt - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 57.93 μs | 83.40 μs | 1.44 | 0.00 | False | | |
|
  • [Log10P1 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 104.30 μs | 146.26 μs | 1.40 | 0.33 | False | | |
|
  • [Atan2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 90.88 μs | 119.60 μs | 1.32 | 0.12 | False | | |
|
  • [Acos - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 68.41 μs | 88.73 μs | 1.30 | 0.13 | False | | |
|
  • [Exp10 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 90.74 μs | 116.96 μs | 1.29 | 0.08 | False | | |
|
  • [Exp2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 93.84 μs | 118.06 μs | 1.26 | 0.11 | False | | |
|
  • [Sin - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 46.33 μs | 52.22 μs | 1.13 | 0.13 | False | | |
|
  • [AtanPi - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 74.15 μs | 83.22 μs | 1.12 | 0.20 | False | | |

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

### System.MathBenchmarks.Double.Exp

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Atan

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Asinh

#### 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.Acos

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Exp10

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Exp2

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.Sin

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Double.AtanPi

#### 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]()
| 36.80 μs | 73.23 μs | 1.99 | 0.09 | False | | |
|
  • [Log - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 41.31 μs | 80.28 μs | 1.94 | 0.02 | False | | |
|
  • [LogP1 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 51.09 μs | 98.84 μs | 1.93 | 0.43 | False | | |
|
  • [Exp10M1 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 62.96 μs | 104.02 μs | 1.65 | 0.08 | False | | |
|
  • [Atanh - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 65.41 μs | 101.91 μs | 1.56 | 0.02 | False | | |
|
  • [Exp10 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 56.85 μs | 87.54 μs | 1.54 | 0.03 | False | | |
|
  • [Atan2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 73.46 μs | 103.16 μs | 1.40 | 0.10 | False | | |
|
  • [Cos - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 39.35 μs | 54.76 μs | 1.39 | 0.25 | False | | |
|
  • [Exp2 - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 57.24 μs | 75.31 μs | 1.32 | 0.06 | False | | |
|
  • [Pow - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 65.01 μs | 85.06 μs | 1.31 | 0.09 | False | | |
|
  • [AcosPi - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 56.33 μs | 66.54 μs | 1.18 | 0.03 | False | | |

![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.MathBenchmarks.Single*'
```

### System.MathBenchmarks.Single.Exp

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Log

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.LogP1

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Exp10M1

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Atanh

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Exp10

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Atan2

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Cos

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Exp2

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.Pow

#### ETL Files

#### Histogram

#### JIT Disasms

### System.MathBenchmarks.Single.AcosPi

#### 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 baseline and compare commits, then inspect the linked benchmark history and source files under src/benchmarks/micro/runtime/Math/Functions/Double, including Exp.cs, Atan.cs, Asinh.cs, Pow.cs, Cbrt.cs, Log10P1.cs, Atan2.cs, Acos.cs, and Exp10.cs. Run the wasm micro benchmarks on Ubuntu 22.04 and determine which change explains the reported regressions; done means the regressions are explained and verified.

Written by the indexing model from the issue text.

Assessment

Tech stack
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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