dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 13 Regressions on 5/1/2026 9:47:36 PM +00:00

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arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro os-linux perf-regression runkind-micro runtimetype-coreclr triage-error untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [8e7e7589051881332c387c46760773d1caed5712](https://github.com/dotnet/runtime/commit/8e7e7589051881332c387c46760773d1caed5712)
Compare | [b74595701421282895300b139f2064745c583f7d](https://github.com/dotnet/runtime/commit/b74595701421282895300b139f2064745c583f7d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8e7e7589051881332c387c46760773d1caed5712...b74595701421282895300b139f2064745c583f7d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.Perf_DefaultFrozenDictionary

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

  • [TryGetValue_True_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 1.73 ms | 2.36 ms | 1.37 | 0.38 | False | | |
|
  • [TryGetValue_False_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 16.24 ms | 21.49 ms | 1.32 | 0.29 | False | | |
|
  • [TryGetValue_True_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 17.29 ms | 21.63 ms | 1.25 | 0.32 | False | | |
|
  • [TryGetValue_False_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 1.75 ms | 2.12 ms | 1.21 | 0.32 | False | | |
|
  • [TryGetValue_False_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 131.42 μs | 157.70 μs | 1.20 | 0.40 | False | | |
|
  • [TryGetValue_True_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 185.68 μs | 220.76 μs | 1.19 | 0.47 | False | | |
|
  • [ToFrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 843.34 μs | 991.18 μs | 1.18 | 0.35 | False | | |
|
  • [TryGetValue_True_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 5.61 μs | 6.25 μs | 1.11 | 0.31 | False | | |
|
  • [ToFrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 80.33 μs | 85.24 μs | 1.06 | 0.38 | False | | |

![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.Collections.Perf_DefaultFrozenDictionary*'
```

### System.Collections.Perf_DefaultFrozenDictionary.TryGetValue_True_FrozenDictionary(Count: 1000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.TryGetValue_False_FrozenDictionary(Count: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.TryGetValue_True_FrozenDictionary(Count: 10000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.TryGetValue_False_FrozenDictionary(Count: 1000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.TryGetValue_False_FrozenDictionary(Count: 100)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.TryGetValue_True_FrozenDictionary(Count: 100)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.ToFrozenDictionary(Count: 100)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.TryGetValue_True_FrozenDictionary(Count: 10)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_DefaultFrozenDictionary.ToFrozenDictionary(Count: 10)

#### 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 | [8e7e7589051881332c387c46760773d1caed5712](https://github.com/dotnet/runtime/commit/8e7e7589051881332c387c46760773d1caed5712)
Compare | [b74595701421282895300b139f2064745c583f7d](https://github.com/dotnet/runtime/commit/b74595701421282895300b139f2064745c583f7d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8e7e7589051881332c387c46760773d1caed5712...b74595701421282895300b139f2064745c583f7d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.TryGetValueTrue<String, String>

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

  • [FrozenDictionaryOptimized - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 855.60 μs | 1098.16 μs | 1.28 | 0.40 | False | | |
|
  • [OrderedDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 1.54 ms | 1.79 ms | 1.16 | 0.34 | False | | |
|
  • [ImmutableDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 3.87 ms | 4.34 ms | 1.12 | 0.46 | 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.Collections.TryGetValueTrue*'
```

### System.Collections.TryGetValueTrue<String, String>.FrozenDictionaryOptimized(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.TryGetValueTrue<String, String>.OrderedDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.TryGetValueTrue<String, String>.ImmutableDictionary(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 | ViperUbuntu
Baseline | [8e7e7589051881332c387c46760773d1caed5712](https://github.com/dotnet/runtime/commit/8e7e7589051881332c387c46760773d1caed5712)
Compare | [b74595701421282895300b139f2064745c583f7d](https://github.com/dotnet/runtime/commit/b74595701421282895300b139f2064745c583f7d)
Diff | [Diff](https://github.com/dotnet/runtime/compare/8e7e7589051881332c387c46760773d1caed5712...b74595701421282895300b139f2064745c583f7d)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.ContainsKeyTrue<String, String>

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

  • [FrozenDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 892.92 μs | 1198.39 μs | 1.34 | 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.ContainsKeyTrue*'
```

### System.Collections.ContainsKeyTrue<String, String>.FrozenDictionary(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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