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Enable Roslyn compiler caching on Windows - #135248
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Copilot review overview
🟢 Approval recommended
The consolidation preserves existing Unix conditions while coherently enabling isolated Windows Roslyn caching and statistics.
Review effort: Balanced
Findings: None
What changed in this PR
Centralizes compiler-cache setup and enables Roslyn output caching for Windows CI jobs while preserving Unix-only sccache behavior.
Changes:
- Consolidates cache setup and statistics templates.
- Enables Windows x64/x86/Arm64 Roslyn caching.
- Adds Windows cache-seeding jobs.
| File | Description |
|---|---|
eng/pipelines/runtime.yml |
Uses shared cache templates and adds Windows cache seeds. |
eng/pipelines/global-build.yml |
Switches to shared cache templates. |
eng/pipelines/coreclr/templates/setup-roslyn-cache.yml |
Removes superseded Roslyn-only setup. |
eng/pipelines/coreclr/templates/setup-build-caches.yml |
Adds cross-platform Roslyn cache setup. |
eng/pipelines/coreclr/templates/sccache-stats.yml |
Removes superseded statistics template. |
eng/pipelines/coreclr/templates/roslyn-cache-stats.yml |
Removes superseded Roslyn-only statistics. |
eng/pipelines/coreclr/templates/jit-hardware-intrinsics-common.yml |
Adopts shared cache templates. |
eng/pipelines/coreclr/templates/build-cache-stats.yml |
Adds consolidated Windows/Unix cache reporting. |
This was referenced Oct 6, 2026
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sbomer
approved these changes
Oct 6, 2026
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/ba-g unrelated failures in diagnostics (caching isn't enabled for those runs) |
This was referenced Oct 6, 2026
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Summary
windows_x64to the rolling DebugCoreCLR_AllSubsetscache seed and cache the separate Windows x86 leg.Measurements
The controlled validation from #133748 measured
libs.testsat 4m53s with the Roslyn cache versus 6m32s without it, a 25.25% reduction. Recent rolling builds reused 21,130 compiler outputs with 352 new stores (98.4% hit rate) across 23 cache-enabled Unix jobs. Windows-specific hit rates will be measurable after the first rolling build seeds the new entries.Validation
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This pull request description was generated with GitHub Copilot.