[Perf] Linux/x64: 2 Improvements on 9/13/2026 3:54:51 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [b9678dcc0e7bac74a0d6b669b39d1007359b0016](https://github.com/dotnet/runtime/commit/b9678dcc0e7bac74a0d6b669b39d1007359b0016)
Compare | [3c4631e63b1de4308e2965b149992b992c9f5318](https://github.com/dotnet/runtime/commit/3c4631e63b1de4308e2965b149992b992c9f5318)
Diff | [Diff](https://github.com/dotnet/runtime/compare/b9678dcc0e7bac74a0d6b669b39d1007359b0016...3c4631e63b1de4308e2965b149992b992c9f5318)
Configs | CompilationMode:wasm, RunKind:micro

### Improvements in System.IO.Tests.Perf_Directory

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

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

| 55.05 ms | 49.74 ms | 0.90 | 0.00 | 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.IO.Tests.Perf_Directory*'
```

### System.IO.Tests.Perf_Directory.RecursiveCreateDeleteDirectory(depth: 100)

#### 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 | [b9678dcc0e7bac74a0d6b669b39d1007359b0016](https://github.com/dotnet/runtime/commit/b9678dcc0e7bac74a0d6b669b39d1007359b0016)
Compare | [3c4631e63b1de4308e2965b149992b992c9f5318](https://github.com/dotnet/runtime/commit/3c4631e63b1de4308e2965b149992b992c9f5318)
Diff | [Diff](https://github.com/dotnet/runtime/compare/b9678dcc0e7bac74a0d6b669b39d1007359b0016...3c4631e63b1de4308e2965b149992b992c9f5318)
Configs | CompilationMode:wasm, RunKind:micro

### Improvements in System.Text.Json.Node.Tests.Perf_Create

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

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

| 3.15 μs | 2.86 μs | 0.91 | 0.21 | 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.Text.Json.Node.Tests.Perf_Create*'
```

### System.Text.Json.Node.Tests.Perf_Create.Create_JsonString

#### 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 docs/benchmarking-workflow-dotnet-runtime.md and the benchmark sources src/benchmarks/micro/libraries/System.IO.FileSystem/Perf.Directory.cs and src/benchmarks/micro/libraries/System.Text.Json/Node/Perf_Create.cs. Run the two listed benchmarks, then compare their reports with the linked baseline and comparison commits. Done means confirming the reported improvements and determining whether this auto-filed result requires follow-up.

Written by the indexing model from the issue text.