[Perf] Linux/x64: 6 Improvements on 1/28/2026 6:34:42 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [cb70f353f84867b25a8695d0dfe4a50930026ea8](https://github.com/dotnet/runtime/commit/cb70f353f84867b25a8695d0dfe4a50930026ea8)
Compare | [5c2326596dc0b21583dbba5db9298c025eacbf64](https://github.com/dotnet/runtime/commit/5c2326596dc0b21583dbba5db9298c025eacbf64)
Diff | [Diff](https://github.com/dotnet/runtime/compare/cb70f353f84867b25a8695d0dfe4a50930026ea8...5c2326596dc0b21583dbba5db9298c025eacbf64)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile

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

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

| 7.60 μs | 7.14 μs | 0.94 | 0.00 | False | | |
|

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

| 7.55 μs | 7.10 μs | 0.94 | 0.00 | False | | |
|

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

| 7.56 μs | 7.13 μs | 0.94 | 0.01 | False | | |
|

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

| 7.58 μs | 7.13 μs | 0.94 | 0.00 | False | | |

![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.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile*'
```

### System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.CreateNew(capacity: 10000000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.CreateNew(capacity: 1000000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.CreateNew(capacity: 100000)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile.CreateNew(capacity: 10000)

#### 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 | [cb70f353f84867b25a8695d0dfe4a50930026ea8](https://github.com/dotnet/runtime/commit/cb70f353f84867b25a8695d0dfe4a50930026ea8)
Compare | [5c2326596dc0b21583dbba5db9298c025eacbf64](https://github.com/dotnet/runtime/commit/5c2326596dc0b21583dbba5db9298c025eacbf64)
Diff | [Diff](https://github.com/dotnet/runtime/compare/cb70f353f84867b25a8695d0dfe4a50930026ea8...5c2326596dc0b21583dbba5db9298c025eacbf64)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.IO.Tests.Perf_Path

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

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

| 1.09 μs | 737.16 ns | 0.68 | 0.00 | False | | |
|

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

| 17.03 ns | 10.15 ns | 0.60 | 0.26 | 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.IO.Tests.Perf_Path*'
```

### System.IO.Tests.Perf_Path.GetRandomFileName

#### ETL Files

#### Histogram

#### JIT Disasms

### System.IO.Tests.Perf_Path.GetFileName

#### 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)