dotnet / dotnet/perf-autofiling-issues

[Perf] Linux/x64: 1 Improvement on 8/21/2026 4:33:08 PM +00:00

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arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro Noise os-linux perf-improvement runkind-micro runtimetype-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [1fb02ff55d2046e7e46b89467235f92e39d2099f](https://github.com/dotnet/runtime/commit/1fb02ff55d2046e7e46b89467235f92e39d2099f)
Compare | [f9b6d584afa7ac1f655c5e9d991b6f9eea1052d1](https://github.com/dotnet/runtime/commit/f9b6d584afa7ac1f655c5e9d991b6f9eea1052d1)
Diff | [Diff](https://github.com/dotnet/runtime/compare/1fb02ff55d2046e7e46b89467235f92e39d2099f...f9b6d584afa7ac1f655c5e9d991b6f9eea1052d1)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Improvements in System.Collections.Perf_Frozen<ReferenceType>

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

  • [TryGetValue_True - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 309.29 μs | 190.37 μs | 0.62 | 0.39 | 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.Collections.Perf_Frozen*'
```

### System.Collections.Perf_Frozen<ReferenceType>.TryGetValue_True(Count: 64)

#### 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)

Contributor guide

No contributing guide indexed for this repository

Research direction

Start with the benchmark source at src/benchmarks/micro/libraries/System.Collections/Frozen/Perf_Frozen.cs lines 82-91, then review the linked history and test report for TryGetValue_True with Count 64. Reproduce it using the provided benchmarks_ci.py command and compare the wasm results. Done means the improvement is explained and any necessary follow-up is identified, but this issue does not specify a code change.

Written by the indexing model from the issue text.

Assessment

Tech stack
python, ubuntu, wasm
Domain
performance, testing-qa
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Active
Clarity
Needs clarification
Newbie friendliness
25/100

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