[Perf] Linux/x64: 3 Improvements on 7/15/2026 7:39:26 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [646ab80e65fcf3cb9f068157f644ead63761ee7c](https://github.com/dotnet/runtime/commit/646ab80e65fcf3cb9f068157f644ead63761ee7c)
Compare | [051c1fd3c13fea8c1e60b68d9c7f63c3173e5593](https://github.com/dotnet/runtime/commit/051c1fd3c13fea8c1e60b68d9c7f63c3173e5593)
Diff | [Diff](https://github.com/dotnet/runtime/compare/646ab80e65fcf3cb9f068157f644ead63761ee7c...051c1fd3c13fea8c1e60b68d9c7f63c3173e5593)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

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

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

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

| 751.08 μs | 90.79 μs | 0.12 | 0.06 | False | | |
|

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

| 7342.82 μs | 910.35 μs | 0.12 | 0.02 | False | | |
|

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

| 113.94 μs | 47.00 μs | 0.41 | 0.06 | 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.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### ETL Files

#### Histogram

#### JIT Disasms

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

#### 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)

Start with the System.IO.MemoryMappedFiles.Tests.Perf_MemoryMappedFile benchmark source at dotnet/performance/src/benchmarks/micro/libraries/System.IO.MemoryMappedFiles/Perf.MemoryMappedFile.cs#L30-L39. Run the documented benchmarks_ci.py command and compare the reported baseline and test timings for the three CreateFromFile capacities. The issue does not define a code change or completion condition, so triage must establish what follow-up is wanted.

Written by the indexing model from the issue text.