dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 12 Improvements on 1/20/2026 3:13:09 AM +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 | ViperUbuntu
Baseline | [de88fe799ce9f061dcf33dc54292cf1c41700434](https://github.com/dotnet/runtime/commit/de88fe799ce9f061dcf33dc54292cf1c41700434)
Compare | [de91bb5034d88c9205096f9c43b05d03b3f62d11](https://github.com/dotnet/runtime/commit/de91bb5034d88c9205096f9c43b05d03b3f62d11)
Diff | [Diff](https://github.com/dotnet/runtime/compare/de88fe799ce9f061dcf33dc54292cf1c41700434...de91bb5034d88c9205096f9c43b05d03b3f62d11)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Perf_Convert

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

  • [FromBase64String - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 58.54 ns | 24.97 ns | 0.43 | 0.02 | False | | |
|
  • [ToBase64String - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 222.66 ns | 123.10 ns | 0.55 | 0.08 | False | | |
|
  • [ToBase64String - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 954.98 ns | 487.40 ns | 0.51 | 0.01 | False | | |
|
  • [ChangeType - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 9.54 ns | 7.34 ns | 0.77 | 0.30 | False | | |
|
  • [ToBase64CharArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 864.79 ns | 373.46 ns | 0.43 | 0.01 | False | | |
|
  • [ToBase64CharArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 193.63 ns | 44.57 ns | 0.23 | 0.13 | False | | |
|
  • [ToDateTime_String - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 487.06 ns | 425.59 ns | 0.87 | 0.05 | False | | |
|
  • [FromBase64Chars - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 58.92 ns | 25.30 ns | 0.43 | 0.04 | 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.Perf_Convert*'
```

### System.Perf_Convert.FromBase64String

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ToBase64String(formattingOptions: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ToBase64String(formattingOptions: InsertLineBreaks)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ChangeType

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ToBase64CharArray(binaryDataSize: 1024, formattingOptions: InsertLineBreaks)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ToBase64CharArray(binaryDataSize: 1024, formattingOptions: None)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.ToDateTime_String(value: "Fri, 27 Feb 2009 03:11:21 GMT")

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Perf_Convert.FromBase64Chars

#### 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 | [de88fe799ce9f061dcf33dc54292cf1c41700434](https://github.com/dotnet/runtime/commit/de88fe799ce9f061dcf33dc54292cf1c41700434)
Compare | [de91bb5034d88c9205096f9c43b05d03b3f62d11](https://github.com/dotnet/runtime/commit/de91bb5034d88c9205096f9c43b05d03b3f62d11)
Diff | [Diff](https://github.com/dotnet/runtime/compare/de88fe799ce9f061dcf33dc54292cf1c41700434...de91bb5034d88c9205096f9c43b05d03b3f62d11)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Buffers.Text.Tests.Base64Tests

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

  • [ConvertTryFromBase64Chars - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 877.52 ns | 50.06 ns | 0.06 | 0.01 | False | | |
|
  • [ConvertToBase64CharArray - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 58.23 ns | 45.31 ns | 0.78 | 0.09 | 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.Buffers.Text.Tests.Base64Tests*'
```

### System.Buffers.Text.Tests.Base64Tests.ConvertTryFromBase64Chars(NumberOfBytes: 1000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Buffers.Text.Tests.Base64Tests.ConvertToBase64CharArray(NumberOfBytes: 1000)

#### 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 | [de88fe799ce9f061dcf33dc54292cf1c41700434](https://github.com/dotnet/runtime/commit/de88fe799ce9f061dcf33dc54292cf1c41700434)
Compare | [de91bb5034d88c9205096f9c43b05d03b3f62d11](https://github.com/dotnet/runtime/commit/de91bb5034d88c9205096f9c43b05d03b3f62d11)
Diff | [Diff](https://github.com/dotnet/runtime/compare/de88fe799ce9f061dcf33dc54292cf1c41700434...de91bb5034d88c9205096f9c43b05d03b3f62d11)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.Perf_LengthBucketsFrozenDictionary

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

  • [TryGetValue_False_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 10.95 ns | 9.31 ns | 0.85 | 0.38 | False | | |
|
  • [TryGetValue_False_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 10.35 ns | 9.32 ns | 0.90 | 0.40 | 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.Perf_LengthBucketsFrozenDictionary*'
```

### System.Collections.Perf_LengthBucketsFrozenDictionary.TryGetValue_False_FrozenDictionary(Count: 10, ItemsPerBucket: 5)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_LengthBucketsFrozenDictionary.TryGetValue_False_FrozenDictionary(Count: 10, ItemsPerBucket: 1)

#### 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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