[Perf] Linux/x64: 9 Regressions on 4/29/2026 3:26:10 PM +00:00

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#72,650 opened on May 7, 2026 2 comments 0 reactions 0 assignees View on GitHub

arch-wasm arch-x64 branch-refs/heads/main compilationmode-wasm kind-micro os-linux perf-regression runkind-micro runtimetype-coreclr triage-error untriaged

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Forks: 8
PR merge metrics: PR metrics pending

Description

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [977f4125aa7cf8fd550f1bb91e966f20a1df6e54](https://github.com/dotnet/runtime/commit/977f4125aa7cf8fd550f1bb91e966f20a1df6e54)
Compare | [7fe7b6f9ee530920febbabdfdc9c2cadbab3348e](https://github.com/dotnet/runtime/commit/7fe7b6f9ee530920febbabdfdc9c2cadbab3348e)
Diff | [Diff](https://github.com/dotnet/runtime/compare/977f4125aa7cf8fd550f1bb91e966f20a1df6e54...7fe7b6f9ee530920febbabdfdc9c2cadbab3348e)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in StoreBlock.AnyLocation

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

[InitBlockAllOnes16 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 52.91 ns | 63.56 ns | 1.20 | 0.50 | False | | |
|

[InitBlockAllZeros64 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 54.16 ns | 62.60 ns | 1.16 | 0.43 | False | | |
|

[InitBlockAllOnes128 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 55.81 ns | 64.46 ns | 1.16 | 0.31 | False | | |
|

[InitBlockAllOnes8 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 55.77 ns | 63.57 ns | 1.14 | 0.44 | False | | |
|

[CopyBlock128 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 62.05 ns | 67.58 ns | 1.09 | 0.54 | False | | |
|

[CopyBlock64 - Duration of single invocation]()
📝 - [Benchmark Source]()
[ADX - Test Multi Config Graph]()

| 62.92 ns | 67.85 ns | 1.08 | 0.50 | False | | |

![graph]()
![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 'StoreBlock.AnyLocation*'
```

### StoreBlock.AnyLocation.InitBlockAllOnes16

#### ETL Files

#### Histogram

#### JIT Disasms

### StoreBlock.AnyLocation.InitBlockAllZeros64

#### ETL Files

#### Histogram

#### JIT Disasms

### StoreBlock.AnyLocation.InitBlockAllOnes128

#### ETL Files

#### Histogram

#### JIT Disasms

### StoreBlock.AnyLocation.InitBlockAllOnes8

#### ETL Files

#### Histogram

#### JIT Disasms

### StoreBlock.AnyLocation.CopyBlock128

#### ETL Files

#### Histogram

#### JIT Disasms

### StoreBlock.AnyLocation.CopyBlock64

#### 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

### Regressions in System.Memory.MemoryMarshal<Byte>

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

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

| 248.45 ns | 273.93 ns | 1.10 | 0.46 | 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.Memory.MemoryMarshal*'
```

### System.Memory.MemoryMarshal<Byte>.TryGetArray

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in MicroBenchmarks.Serializers.Xml_FromStream<CollectionsOfPrimitives>

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

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

| 111.20 ms | 118.84 ms | 1.07 | 0.31 | 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 'MicroBenchmarks.Serializers.Xml_FromStream*'
```

### MicroBenchmarks.Serializers.Xml_FromStream<CollectionsOfPrimitives>.DataContractSerializer_

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

---

### Run Information

### Regressions in System.Collections.CreateAddAndRemove<Int32>

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

[OrderedDictionary - Duration of single invocation]()
[ADX - Test Multi Config Graph]()

| 25.74 ms | 29.37 ms | 1.14 | 0.47 | 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<Int32>.OrderedDictionary(Size: 512)

#### ETL Files

#### Histogram

#### JIT Disasms

### Docs

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Assessment

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[Perf] Linux/x64: 9 Regressions on 4/29/2026 3:26:10 PM +00:00

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