[Perf] Linux/x64: 3 Regressions on 8/14/2026 9:38:18 AM +00:00

### Run Information

Name | Value
-- | --
Architecture | x64
OS | ubuntu 22.04
Queue | ViperUbuntu
Baseline | [283314d5d7f2d77d1a31087ec962a4c407106445](https://github.com/dotnet/sdk/commit/283314d5d7f2d77d1a31087ec962a4c407106445)
Compare | [7cdb217445905f3342bbb0266a4497b9a014389a](https://github.com/dotnet/sdk/commit/7cdb217445905f3342bbb0266a4497b9a014389a)
Diff | [Diff](https://github.com/dotnet/sdk/compare/283314d5d7f2d77d1a31087ec962a4c407106445...7cdb217445905f3342bbb0266a4497b9a014389a)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.GroupedCollisionTesterBenchmarks

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

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

| 20.63 μs | 29.32 μs | 1.42 | 0.00 | True | | |
|

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

| 233.28 μs | 256.70 μs | 1.10 | 0.00 | True | | |

![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 'DemoBenchmarks.GroupedCollisionTesterBenchmarks*'
```

### DemoBenchmarks.GroupedCollisionTesterBenchmarks.CheapCollisionBenchmarks

#### ETL Files

#### Histogram

#### JIT Disasms

### DemoBenchmarks.GroupedCollisionTesterBenchmarks.ModerateCostCollisionBenchmarks

#### 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 | [283314d5d7f2d77d1a31087ec962a4c407106445](https://github.com/dotnet/sdk/commit/283314d5d7f2d77d1a31087ec962a4c407106445)
Compare | [7cdb217445905f3342bbb0266a4497b9a014389a](https://github.com/dotnet/sdk/commit/7cdb217445905f3342bbb0266a4497b9a014389a)
Diff | [Diff](https://github.com/dotnet/sdk/compare/283314d5d7f2d77d1a31087ec962a4c407106445...7cdb217445905f3342bbb0266a4497b9a014389a)
Configs | CompilationMode:tiered, RunKind:bepuphysics

### Regressions in DemoBenchmarks.GatherScatterBenchmarks

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

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

| 21.68 μs | 25.11 μs | 1.16 | 0.00 | True | | |

![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 'DemoBenchmarks.GatherScatterBenchmarks*'
```

### DemoBenchmarks.GatherScatterBenchmarks.GatherState

#### 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 benchmark sources at src/benchmarks/real-world/bepuphysics2/GroupedCollisionTesterBenchmarks.cs and GatherScatterBenchmarks.cs, then run the listed benchmarks_ci.py filters on Ubuntu. Compare the generated reports with the linked baseline and comparison commits to identify the cause of the three regressions. Done means the regressions are explained and the benchmark results are validated against the baseline.

Written by the indexing model from the issue text.