dotnet / dotnet/perf-autofiling-issues

[Perf] Windows/x64: 7 Improvements on 6/22/2026 9:59:16 PM +00:00

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arch-x64 branch-refs/heads/main compilationmode-tiered kind-micro os-windows perf-improvement PGO runkind-micro runtime-coreclr untriaged
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Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | Windows 10.0.22631
Queue | ViperWindows
Baseline | [06b80b7dccace56abf56e91e72ee26c2a682b76e](https://github.com/dotnet/runtime/commit/06b80b7dccace56abf56e91e72ee26c2a682b76e)
Compare | [929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae](https://github.com/dotnet/runtime/commit/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Diff | [Diff](https://github.com/dotnet/runtime/compare/06b80b7dccace56abf56e91e72ee26c2a682b76e...929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.TryGetValueTrue<Int32, Int32>

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

  • [FrozenDictionaryOptimized - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.18 μs | 1.03 μs | 0.87 | 0.00 | False | | |
|
  • [Dictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.31 μs | 1.20 μs | 0.92 | 0.00 | False | | |
|
  • [IDictionary - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 1.38 μs | 1.27 μs | 0.92 | 0.01 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.TryGetValueTrue*'
```

### System.Collections.TryGetValueTrue<Int32, Int32>.FrozenDictionaryOptimized(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.TryGetValueTrue<Int32, Int32>.Dictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.TryGetValueTrue<Int32, Int32>.IDictionary(Size: 512)

#### 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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [4e663ebdcf1759b3bc787d069977a2bf35b90779](https://github.com/dotnet/runtime/commit/4e663ebdcf1759b3bc787d069977a2bf35b90779)
Compare | [929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae](https://github.com/dotnet/runtime/commit/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4e663ebdcf1759b3bc787d069977a2bf35b90779...929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.Perf_LengthBucketsFrozenDictionary

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

  • [TryGetValue_True_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 48.90 μs | 43.12 μs | 0.88 | 0.09 | False | | |
|
  • [TryGetValue_True_FrozenDictionary - Duration of single invocation]()
  • [ADX - Test Multi Config Graph]()
| 2.58 μs | 2.40 μs | 0.93 | 0.02 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.Perf_LengthBucketsFrozenDictionary*'
```

### System.Collections.Perf_LengthBucketsFrozenDictionary.TryGetValue_True_FrozenDictionary(Count: 10000, ItemsPerBucket: 1)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.Perf_LengthBucketsFrozenDictionary.TryGetValue_True_FrozenDictionary(Count: 1000, ItemsPerBucket: 1)

#### 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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [59979e6401af21c7cdf4f61fb35ea3568cb93e5d](https://github.com/dotnet/runtime/commit/59979e6401af21c7cdf4f61fb35ea3568cb93e5d)
Compare | [929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae](https://github.com/dotnet/runtime/commit/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Diff | [Diff](https://github.com/dotnet/runtime/compare/59979e6401af21c7cdf4f61fb35ea3568cb93e5d...929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Buffers.Binary.Tests.BinaryReadAndWriteTests

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

  • [MeasureReverseUsingNtoH - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 547.43 ns | 412.27 ns | 0.75 | 0.10 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Binary.Tests.BinaryReadAndWriteTests*'
```

### System.Buffers.Binary.Tests.BinaryReadAndWriteTests.MeasureReverseUsingNtoH

#### 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 | Windows 10.0.22631
Queue | ViperWindows
Baseline | [4e663ebdcf1759b3bc787d069977a2bf35b90779](https://github.com/dotnet/runtime/commit/4e663ebdcf1759b3bc787d069977a2bf35b90779)
Compare | [929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae](https://github.com/dotnet/runtime/commit/929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Diff | [Diff](https://github.com/dotnet/runtime/compare/4e663ebdcf1759b3bc787d069977a2bf35b90779...929ca574fb3f6ac7c9683f5d5983bbf2bf56b3ae)
Configs | CompilationMode:tiered, RunKind:micro

### Improvements in System.Collections.IndexerSetReverse<String>

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

  • [Span - Duration of single invocation]()
  • 📝 - [Benchmark Source]()
  • [ADX - Test Multi Config Graph]()
| 283.25 ns | 191.96 ns | 0.68 | 0.04 | 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
py .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Collections.IndexerSetReverse*'
```

### System.Collections.IndexerSetReverse<String>.Span(Size: 512)

#### 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 performance/src/benchmarks/micro/libraries/System.Collections/TryGetValue/TryGetValueTrue.cs and read the benchmarking workflow documentation. Run benchmarks_ci.py with the listed TryGetValueTrue filter, then inspect the linked reports and commit diff. The issue does not define a concrete change or completion condition.

Written by the indexing model from the issue text.

Assessment

Tech stack
csharp, python
Domain
performance
Issue type
Bug
Difficulty
5/5
Estimated time
Over a week
Activity status
Quiet
Clarity
Needs clarification
Newbie friendliness
20/100

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