dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 14 Improvements on 1/22/2026 5:44:58 PM +00:00

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arch-x64 branch-refs/heads/main kind-micro os-linux perf-improvement runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | TigerUbuntu
Baseline | [20078050f3314428d8ed376dc0085b35856b105a](https://github.com/dotnet/runtime/commit/20078050f3314428d8ed376dc0085b35856b105a)
Compare | [6489d3644fdda304c253ef0f943a58aa91393d66](https://github.com/dotnet/runtime/commit/6489d3644fdda304c253ef0f943a58aa91393d66)
Diff | [Diff](https://github.com/dotnet/runtime/compare/20078050f3314428d8ed376dc0085b35856b105a...6489d3644fdda304c253ef0f943a58aa91393d66)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Text.Tests.Perf_Encoding

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

  • [GetBytes - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.70 ns | 16.42 ns | 0.93 | 0.05 | False | | |
|
  • [GetBytes - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 18.67 ns | 15.24 ns | 0.82 | 0.03 | False | | |
|
  • [GetEncoder - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.75 ns | 6.54 ns | 0.75 | 0.06 | False | | |
|
  • [GetEncoder - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.85 ns | 6.69 ns | 0.76 | 0.10 | False | | |
|
  • [GetEncoder - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.50 ns | 7.04 ns | 0.83 | 0.09 | False | | |
|
  • [GetString - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 19.86 ns | 16.61 ns | 0.84 | 0.03 | False | | |
|
  • [GetEncoder - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 8.80 ns | 6.77 ns | 0.77 | 0.07 | False | | |
|
  • [GetString - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 17.57 ns | 15.54 ns | 0.88 | 0.02 | 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.Text.Tests.Perf_Encoding*'
```

### System.Text.Tests.Perf_Encoding.GetBytes(size: 16, encName: "utf-8")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Tests.Perf_Encoding.GetBytes(size: 16, encName: "ascii")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Tests.Perf_Encoding.GetEncoder(size: 16, encName: "utf-8")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Tests.Perf_Encoding.GetEncoder(size: 16, encName: "ascii")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Tests.Perf_Encoding.GetEncoder(size: 512, encName: "ascii")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Tests.Perf_Encoding.GetString(size: 16, encName: "utf-8")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Tests.Perf_Encoding.GetEncoder(size: 512, encName: "utf-8")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.Tests.Perf_Encoding.GetString(size: 16, encName: "ascii")

#### 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 | TigerUbuntu
Baseline | [20078050f3314428d8ed376dc0085b35856b105a](https://github.com/dotnet/runtime/commit/20078050f3314428d8ed376dc0085b35856b105a)
Compare | [6489d3644fdda304c253ef0f943a58aa91393d66](https://github.com/dotnet/runtime/commit/6489d3644fdda304c253ef0f943a58aa91393d66)
Diff | [Diff](https://github.com/dotnet/runtime/compare/20078050f3314428d8ed376dc0085b35856b105a...6489d3644fdda304c253ef0f943a58aa91393d66)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.CreateAddAndRemove<String>

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

  • [HashSet - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 21.35 μs | 15.80 μs | 0.74 | 0.45 | 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.Collections.CreateAddAndRemove*'
```

### System.Collections.CreateAddAndRemove<String>.HashSet(Size: 512)

#### 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 | TigerUbuntu
Baseline | [20078050f3314428d8ed376dc0085b35856b105a](https://github.com/dotnet/runtime/commit/20078050f3314428d8ed376dc0085b35856b105a)
Compare | [6489d3644fdda304c253ef0f943a58aa91393d66](https://github.com/dotnet/runtime/commit/6489d3644fdda304c253ef0f943a58aa91393d66)
Diff | [Diff](https://github.com/dotnet/runtime/compare/20078050f3314428d8ed376dc0085b35856b105a...6489d3644fdda304c253ef0f943a58aa91393d66)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.IterateFor<String>

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

  • [IList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.95 μs | 288.34 ns | 0.15 | 0.02 | 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.Collections.IterateFor*'
```

### System.Collections.IterateFor<String>.IList(Size: 512)

#### 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 | TigerUbuntu
Baseline | [20078050f3314428d8ed376dc0085b35856b105a](https://github.com/dotnet/runtime/commit/20078050f3314428d8ed376dc0085b35856b105a)
Compare | [6489d3644fdda304c253ef0f943a58aa91393d66](https://github.com/dotnet/runtime/commit/6489d3644fdda304c253ef0f943a58aa91393d66)
Diff | [Diff](https://github.com/dotnet/runtime/compare/20078050f3314428d8ed376dc0085b35856b105a...6489d3644fdda304c253ef0f943a58aa91393d66)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.TryGetValueFalse<SmallClass, SmallClass>

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

  • [SortedList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 40.55 μs | 27.89 μs | 0.69 | 0.41 | False | | |
|
  • [ImmutableSortedDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 45.90 μs | 21.51 μs | 0.47 | 0.48 | 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 'System.Collections.TryGetValueFalse*'
```

### System.Collections.TryGetValueFalse<SmallClass, SmallClass>.SortedList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.TryGetValueFalse<SmallClass, SmallClass>.ImmutableSortedDictionary(Size: 512)

#### 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 | TigerUbuntu
Baseline | [20078050f3314428d8ed376dc0085b35856b105a](https://github.com/dotnet/runtime/commit/20078050f3314428d8ed376dc0085b35856b105a)
Compare | [6489d3644fdda304c253ef0f943a58aa91393d66](https://github.com/dotnet/runtime/commit/6489d3644fdda304c253ef0f943a58aa91393d66)
Diff | [Diff](https://github.com/dotnet/runtime/compare/20078050f3314428d8ed376dc0085b35856b105a...6489d3644fdda304c253ef0f943a58aa91393d66)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.IndexerSetReverse<String>

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

  • [IList - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.39 μs | 690.15 ns | 0.50 | 0.02 | 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.Collections.IndexerSetReverse*'
```

### System.Collections.IndexerSetReverse<String>.IList(Size: 512)

#### 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 | TigerUbuntu
Baseline | [20078050f3314428d8ed376dc0085b35856b105a](https://github.com/dotnet/runtime/commit/20078050f3314428d8ed376dc0085b35856b105a)
Compare | [6489d3644fdda304c253ef0f943a58aa91393d66](https://github.com/dotnet/runtime/commit/6489d3644fdda304c253ef0f943a58aa91393d66)
Diff | [Diff](https://github.com/dotnet/runtime/compare/20078050f3314428d8ed376dc0085b35856b105a...6489d3644fdda304c253ef0f943a58aa91393d66)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.ContainsKeyFalse<String, String>

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

  • [Dictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 5.93 μs | 5.30 μs | 0.89 | 0.44 | 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.Collections.ContainsKeyFalse*'
```

### System.Collections.ContainsKeyFalse<String, String>.Dictionary(Size: 512)

#### 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)

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