[Perf] Linux/arm64: 14 Improvements on 1/22/2026 7:50:40 PM +00:00

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#68,200 opened on Jan 29, 2026 0 comments 0 reactions 0 assignees View on GitHub

ampere arch-arm64 branch-refs/heads/main kind-micro os-linux perf-improvement runtime-coreclr untriaged

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Forks: 8
PR merge metrics: PR metrics pending

Description

### Run Information

Name | Value
-- | --
Architecture | arm64
OS | ubuntu 22.04
Queue | AmpereUbuntu
Baseline | [2cd0cc89e2bdbcaa804c93a36adefa055d851c40](https://github.com/dotnet/runtime/commit/2cd0cc89e2bdbcaa804c93a36adefa055d851c40)
Compare | [4657f3c907fe31c7cc818f81c316aa74f90b9906](https://github.com/dotnet/runtime/commit/4657f3c907fe31c7cc818f81c316aa74f90b9906)
Diff | [Diff](https://github.com/dotnet/runtime/compare/2cd0cc89e2bdbcaa804c93a36adefa055d851c40...4657f3c907fe31c7cc818f81c316aa74f90b9906)
Configs | CompilationMode:tiered, RunKind:micro

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

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

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

| 32.95 μs | 29.35 μs | 0.89 | 0.02 | 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.CreateAddAndRemove*'
```

### System.Collections.CreateAddAndRemove<String>.HashSet(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

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

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

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

| 2.53 μs | 608.33 ns | 0.24 | 0.01 | False | | |
|

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

| 194.37 ns | 179.24 ns | 0.92 | 0.00 | False | | |
|

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

| 195.39 ns | 178.31 ns | 0.91 | 0.00 | 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.Collections.IterateFor*'
```

### System.Collections.IterateFor<String>.IList(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.IterateFor<String>.ImmutableArray(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.IterateFor<String>.Array(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

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

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

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

| 2.14 μs | 876.08 ns | 0.41 | 0.01 | 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.IndexerSetReverse*'
```

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

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Net.Primitives.Tests.IPAddressPerformanceTests

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

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

| 7.46 ns | 5.02 ns | 0.67 | 0.46 | False | | |
|

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

| 7.17 ns | 5.68 ns | 0.79 | 0.47 | False | | |
|

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

| 1.11 ns | 0.00 ns | 0.00 | 0.57 | False | | |
|

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

| 6.71 ns | 4.91 ns | 0.73 | 0.45 | False | | |
|

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

| 9.45 ns | 5.07 ns | 0.54 | 0.43 | False | | |

![graph]()
![graph]()
![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.Net.Primitives.Tests.IPAddressPerformanceTests*'
```

### System.Net.Primitives.Tests.IPAddressPerformanceTests.Ctor_Span(address: [143, 24, 20, 36])

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Primitives.Tests.IPAddressPerformanceTests.GetAddressBytes(address: 1020:3040:5060:7080:9010:1112:1314:1516)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Primitives.Tests.IPAddressPerformanceTests.TryWriteBytes(address: 143.24.20.36)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Primitives.Tests.IPAddressPerformanceTests.GetAddressBytes(address: 143.24.20.36)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Net.Primitives.Tests.IPAddressPerformanceTests.Ctor_Bytes(address: [143, 24, 20, 36])

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Collections.TryGetValueFalse<SmallClass, SmallClass>

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

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

| 68.64 μs | 25.89 μs | 0.38 | 0.07 | False | | |
|

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

| 57.65 μs | 30.09 μs | 0.52 | 0.23 | 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.Collections.TryGetValueFalse*'
```

### System.Collections.TryGetValueFalse<SmallClass, SmallClass>.SortedDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### System.Collections.TryGetValueFalse<SmallClass, SmallClass>.ImmutableSortedDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Collections.ContainsKeyTrue<String, String>

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

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

| 13.44 μs | 9.40 μs | 0.70 | 0.11 | 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.ContainsKeyTrue*'
```

### System.Collections.ContainsKeyTrue<String, String>.IDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Improvements in System.Buffers.Tests.SearchValuesByteTests

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

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

| 26.06 ns | 23.94 ns | 0.92 | 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
python3 .\performance\scripts\benchmarks_ci.py -f net8.0 --filter 'System.Buffers.Tests.SearchValuesByteTests*'
```

### System.Buffers.Tests.SearchValuesByteTests.IndexOfAnyExcept(Values: "abcdefABCDEF0123456789Ü")

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

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[Perf] Linux/arm64: 14 Improvements on 1/22/2026 7:50:40 PM +00:00

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