[Perf] Linux/x64: 3 Regressions on 4/9/2026 7:19:09 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [1c60926108333917b419fd5489fb6d2070317222](https://github.com/dotnet/runtime/commit/1c60926108333917b419fd5489fb6d2070317222)
Compare | [cc78323ef440208bab9bd99fee82e3ea40ec61a5](https://github.com/dotnet/runtime/commit/cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1c60926108333917b419fd5489fb6d2070317222...cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.Threading.Tests.Perf_SemaphoreSlim

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

• [ReleaseWaitAsync_WithTimeout - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 2.93 μs | 3.75 μs | 1.28 | 0.38 | False | | |

[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.Threading.Tests.Perf_SemaphoreSlim*'
```

### System.Threading.Tests.Perf_SemaphoreSlim.ReleaseWaitAsync_WithTimeout

#### 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 | [1c60926108333917b419fd5489fb6d2070317222](https://github.com/dotnet/runtime/commit/1c60926108333917b419fd5489fb6d2070317222)
Compare | [cc78323ef440208bab9bd99fee82e3ea40ec61a5](https://github.com/dotnet/runtime/commit/cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1c60926108333917b419fd5489fb6d2070317222...cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Configs | CompilationMode:tiered, RunKind:micro

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

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

• [K_Max_Elements - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 1.24 μs | 1.62 μs | 1.30 | 0.01 | False | | |

[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>.K_Max_Elements(Size: 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 | [1c60926108333917b419fd5489fb6d2070317222](https://github.com/dotnet/runtime/commit/1c60926108333917b419fd5489fb6d2070317222)
Compare | [cc78323ef440208bab9bd99fee82e3ea40ec61a5](https://github.com/dotnet/runtime/commit/cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1c60926108333917b419fd5489fb6d2070317222...cc78323ef440208bab9bd99fee82e3ea40ec61a5)
Configs | CompilationMode:tiered, RunKind:micro

### Regressions in System.IO.Tests.Perf_FileStream

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

• [ReadAsync - Duration of single invocation]()
• 📝 - [Benchmark Source]()
• [ADX - Test Multi Config Graph]()

| 833.65 μs | 1001.25 μs | 1.20 | 0.17 | False | | |

[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.IO.Tests.Perf_FileStream*'
```

### System.IO.Tests.Perf_FileStream.ReadAsync(fileSize: 1048576, userBufferSize: 512, options: None)

#### 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)