[Perf] Linux/x64: 2 Improvements on 6/23/2026 12:06:09 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae](https://github.com/dotnet/runtime/commit/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Compare | [f4430a4ba762ef82841ff7a8c340ed8854b2bca9](https://github.com/dotnet/runtime/commit/f4430a4ba762ef82841ff7a8c340ed8854b2bca9)
Diff | [Diff](https://github.com/dotnet/runtime/compare/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae...f4430a4ba762ef82841ff7a8c340ed8854b2bca9)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Text.RegularExpressions.Tests.Perf_Regex_Cache

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

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

| 95.57 ms | 83.53 ms | 0.87 | 0.06 | False | | |
|

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

| 10.03 ms | 8.91 ms | 0.89 | 0.05 | 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.Text.RegularExpressions.Tests.Perf_Regex_Cache*'
```

### System.Text.RegularExpressions.Tests.Perf_Regex_Cache.IsMatch_Multithreading(total: 400000, unique: 7, cacheSize: 15)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Text.RegularExpressions.Tests.Perf_Regex_Cache.IsMatch_Multithreading(total: 40000, unique: 1600, cacheSize: 3200)

#### 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 linked benchmark source, src/benchmarks/micro/libraries/System.Text.RegularExpressions/Perf.Regex.Cache.cs, and the reported System.Text.RegularExpressions.Tests.Perf_Regex_Cache cases. Run the supplied benchmarks_ci.py command on Ubuntu 22.04 and compare the two configurations against the listed baseline and test commits. Done requires a confirmed explanation or reproducible change for the measured performance difference.

Written by the indexing model from the issue text.