[Perf] Linux/x64: 3 Regressions on 7/24/2026 11:49:28 PM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [dad8c23384924cd46ba8d4482131416443b06445](https://github.com/dotnet/runtime/commit/dad8c23384924cd46ba8d4482131416443b06445)
Compare | [2826b2dcc5cbba79fa03297c84f3ed335f4d758f](https://github.com/dotnet/runtime/commit/2826b2dcc5cbba79fa03297c84f3ed335f4d758f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/dad8c23384924cd46ba8d4482131416443b06445...2826b2dcc5cbba79fa03297c84f3ed335f4d758f)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.CreateAddAndClear<String>

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

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

| 952.70 μs | 1119.95 μs | 1.18 | 0.32 | 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.CreateAddAndClear*'
```

### System.Collections.CreateAddAndClear<String>.ICollection(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 | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [dad8c23384924cd46ba8d4482131416443b06445](https://github.com/dotnet/runtime/commit/dad8c23384924cd46ba8d4482131416443b06445)
Compare | [2826b2dcc5cbba79fa03297c84f3ed335f4d758f](https://github.com/dotnet/runtime/commit/2826b2dcc5cbba79fa03297c84f3ed335f4d758f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/dad8c23384924cd46ba8d4482131416443b06445...2826b2dcc5cbba79fa03297c84f3ed335f4d758f)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.Tests.Perf_PriorityQueue<String, String>

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

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

| 3.69 ms | 4.21 ms | 1.14 | 0.28 | 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.Tests.Perf_PriorityQueue*'
```

### System.Collections.Tests.Perf_PriorityQueue<String, String>.HeapSort(Size: 100)

#### 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 | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [dad8c23384924cd46ba8d4482131416443b06445](https://github.com/dotnet/runtime/commit/dad8c23384924cd46ba8d4482131416443b06445)
Compare | [2826b2dcc5cbba79fa03297c84f3ed335f4d758f](https://github.com/dotnet/runtime/commit/2826b2dcc5cbba79fa03297c84f3ed335f4d758f)
Diff | [Diff](https://github.com/dotnet/runtime/compare/dad8c23384924cd46ba8d4482131416443b06445...2826b2dcc5cbba79fa03297c84f3ed335f4d758f)
Configs | CompilationMode:wasm, RunKind:micro, RuntimeType:coreclr

### Regressions in System.Collections.IterateForEach<String>

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

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

| 600.55 μs | 1032.09 μs | 1.72 | 0.34 | 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.IterateForEach*'
```

### System.Collections.IterateForEach<String>.ConcurrentQueue(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)

Start with the three benchmark sources: src/benchmarks/micro/libraries/System.Collections/CreateAddAndClear.cs, PriorityQueue/Perf_PriorityQueue.cs, and Iterate/IterateForEach.cs. Run the listed benchmarks with benchmarks_ci.py, then compare the baseline and test commits and inspect the linked reports. Done means identifying the cause of the three Linux/x64 WASM regressions and confirming corrected results.

Written by the indexing model from the issue text.