[efficiency-improver] Monthly Activity 2026-09

[github-actions]

Activity for September 2026

Suggested Actions for Maintainer

No suggested actions at this time.

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
LOW	Code-Level	HtmlReportMerger.ConcatenateTests: CreateTestIdentity computed once via .Select() (counting) then again in main loop	Same shape as fixed CollapseRetryAttempts bug, but only 1 string.Join/call — good small follow-up
LOW	Code-Level	TestExecutionManager MethodLevel parallel array-per-test in setup	One-time setup cost
LOW	Code-Level	TestContextImplementation.SanitizeName: Array.IndexOf per char	Only on first TestTempDirectory access
LOW-MEDIUM	Code-Level	RuntimeRegistrationEmitter.EmitResolveMethodHelper/ResolveProperty (source generator): O(N×M) linear scan per test method at module-init	One-time per-assembly startup cost, not a hot loop
LOW	Code-Level	VideoProduction.cs ProducePerTestVideosAsync O(tests×segments) overlap scan	Runs once at end-of-run (cold path)
LOW	Test Infra	test/Utilities/Microsoft.Testing.TestInfrastructure: regex-on-error-retry, tiny-collection LINQ	Cold/low-frequency, negligible scale

Repo continues to be actively self-optimized by maintainers/Copilot coding agent.

Discovered Commands

Command	Purpose
./build.sh	Full restore + build
./build.sh -test	Run unit tests
./build.sh -pack	Build + produce NuGet packages
./build.sh -pack -test -integrationTest	Full pipeline incl. acceptance tests

Performance runner: test/Performance/MSTest.Performance.Runner/. Nightly timing workflow: .github/workflows/perf-timing-nightly.yml (Phase 1 artifact collection + Phase 2 regression detection, merged via PR #10720).

Run History

2026-09-04 UTC - Run

• 🔧 Task 4: confirmed no open [efficiency-improver]-prefixed PRs before starting — nothing to maintain.
• 🔍 Task 2: scanned core Microsoft.Testing.Platform/.IPC (no issues — regex pre-compiled, IPC serializers allocation-free) and Retry/TrxReport/HtmlReport extensions (found one genuine candidate).
• ✅ Implemented and measured a fix: HtmlReportMerger.CollapseRetryAttempts was computing CreateRetryBaseIdentity (2 string.Joins) twice per test row — once in a LINQ ambiguity scan, once in the slot-assignment loop. Cached it into a string[] computed once per test.
• 📊 Energy efficiency evidence (GC-allocation proxy, GC.GetAllocatedBytesForCurrentThread(), 20,000-test/40,000-row synthetic report, before/after via git stash): 166,408,536 → 156,021,208 bytes allocated (~10.4 MB / ~6.2% reduction).
• ✅ Verified: dotnet build on Microsoft.Testing.Extensions.HtmlReport.csproj (net8.0/net9.0/netstandard2.0) — 0 warnings/errors. HtmlReport*-filtered unit tests — 58 passed, 2 pre-existing skips, 0 failed.
• 🚀 Opened draft PR "Cache retry-identity computation in HtmlReportMerger.CollapseRetryAttempts" (branch efficiency/htmlreport-merger-identity-caching, label area/performance).
• 📝 Noted a lower-severity follow-up candidate for a future run: HtmlReportMerger.ConcatenateTests has the same redundant-identity-computation shape (added to backlog table above).
• 💬 Task 5: re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824 (RFC) — no new comments since 2026-08-27; not re-engaged (anti-spam).

2026-09-03 21:42 UTC - Run

• 🔍 Reviewed ~40 commits landed since 2026-08-31: MSBuildCache CI-infra removal (Remove MSBuildCache integration #11007/Remove MSBuildCache integration #11004, no runtime impact), source-generator DynamicDependency narrowing (Narrow source generator DynamicDependency rooting #10998, an AOT-footprint improvement) and constant-emission fix (Fix source-generated constant emission #10996, compile-time only), telemetry consumer starvation fix (Prevent .NET Framework telemetry consumer starvation #10988, narrow .NET Framework-only), Retry response-file fix (Fix Retry with response files #10963, cold/retry-only path). No new HIGH/MEDIUM hot-path opportunities found.
• 🔍 Noted one LOW-MEDIUM item: RuntimeRegistrationEmitter.EmitResolveMethodHelper/ResolveProperty does an O(N×M) linear scan per test method, but only runs once per assembly at module-init (cold/startup path) — added to backlog for awareness, not actionable as a PR without stronger evidence of impact.
• 💬 Task 5: re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824 (RFC) — no new comments since 2026-08-27; not re-engaged (anti-spam). No other open efficiency/performance-labeled issues found requiring comment.
• 🔧 Task 4: confirmed no open [efficiency-improver]-prefixed PRs — nothing to maintain.
• 📅 Month rollover: closed August tracker [efficiency-improver] Monthly Activity 2026-08 #10382 (auto-closed by system on 2026-09-01), opened this new September tracking issue.
• 📊 No new PR created this run — pure monitoring pass; repo continues to be very actively self-optimized by maintainers/Copilot coding agent.> [!WARNING]

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