dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 7 Regressions on 5/1/2026 4:55:08 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 | [bfaabae213cf02d343846d253b7149a03819680d](https://github.com/dotnet/runtime/commit/bfaabae213cf02d343846d253b7149a03819680d)
Compare | [bd9e85e4b37557e649fccc083f33a50acdda2dde](https://github.com/dotnet/runtime/commit/bd9e85e4b37557e649fccc083f33a50acdda2dde)
Diff | [Diff](https://github.com/dotnet/runtime/compare/bfaabae213cf02d343846d253b7149a03819680d...bd9e85e4b37557e649fccc083f33a50acdda2dde)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in PerfLabTests.LowLevelPerf

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

  • [GenericClassWithSTringGenericInstanceMethod - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 2.26 ms | 2.71 ms | 1.20 | 0.58 | False | | |
|
  • [NewDelegateClassEmptyInstanceFn - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 6.38 ms | 7.09 ms | 1.11 | 0.26 | False | | |
|
  • [GenericClassGenericStaticField - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 12.54 ms | 13.89 ms | 1.11 | 0.31 | False | | |
|
  • [EmptyStaticFunction - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 257.35 ms | 272.18 ms | 1.06 | 0.32 | False | | |
|
  • [GenericClassGenericStaticMethod - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 15.74 ms | 16.62 ms | 1.06 | 0.23 | False | | |

![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 'PerfLabTests.LowLevelPerf*'
```

### PerfLabTests.LowLevelPerf.GenericClassWithSTringGenericInstanceMethod

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.LowLevelPerf.NewDelegateClassEmptyInstanceFn

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.LowLevelPerf.GenericClassGenericStaticField

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.LowLevelPerf.EmptyStaticFunction

#### ETL Files

#### Histogram

#### JIT Disasms

### PerfLabTests.LowLevelPerf.GenericClassGenericStaticMethod

#### 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 | [bfaabae213cf02d343846d253b7149a03819680d](https://github.com/dotnet/runtime/commit/bfaabae213cf02d343846d253b7149a03819680d)
Compare | [bd9e85e4b37557e649fccc083f33a50acdda2dde](https://github.com/dotnet/runtime/commit/bd9e85e4b37557e649fccc083f33a50acdda2dde)
Diff | [Diff](https://github.com/dotnet/runtime/compare/bfaabae213cf02d343846d253b7149a03819680d...bd9e85e4b37557e649fccc083f33a50acdda2dde)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.Tests.Perf_PriorityQueue<Int32, Int32>

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

  • [Dequeue_And_Enqueue - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 39.29 μs | 46.69 μs | 1.19 | 0.34 | False | | |
|
  • [K_Max_Elements - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 10.06 μs | 11.24 μs | 1.12 | 0.29 | 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.Tests.Perf_PriorityQueue*'
```

### System.Collections.Tests.Perf_PriorityQueue<Int32, Int32>.Dequeue_And_Enqueue(Size: 10)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Tests.Perf_PriorityQueue<Int32, Int32>.K_Max_Elements(Size: 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)

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