[efficiency-improver] Monthly Activity 2026-09

[github-actions]

Activity for September 2026

Suggested Actions for Maintainer

• Review PR: "Hoist PathContainment prefix normalization out of Retry recovery loops" (draft, branch efficiency/retry-pathcontainment-hoist-normalization, ~20x faster/100% less alloc per call) - View open PRs

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
LOW	Code-Level	TestExecutionManager MethodLevel parallel array-per-test in setup	One-time setup cost
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
LOW	Code-Level	MSTestTelemetryDataCollector.SerializeCollection/SerializeDictionary: OrderBy on telemetry flush	Once per session (cold path)
LOW	Code-Level	TestClassModelBuilder (source generator): Where/GroupBy/Select for duplicate-method detection	Compile-time only, not a runtime hot path
LOW	Code-Level	src/Adapter/MSTest.TestAdapter: reflection-based GetRuntimeMethod lookup in TestMethodFilter (cold, once per discovery context)	Negligible, cold path
LOW	Code-Level	WindowTest.WindowSetup (MSTest.Windows.UIAutomation): fixed 50ms poll interval for window discovery, no exponential backoff	Bounded by 10s timeout, once per test class (cold path); no measurement story in this sandbox (Windows-only)
LOW	Infrastructure	CI output-byte-count health metric	Needs maintainer discussion
LOW-MEDIUM	Code-Level	Executable-condition analyzer (#10634) recursive tree walk not memoized	Gated behind narrow guards, not urgent; evaluate memoization feasibility before attempting

PathContainment.IsUnderDirectory's per-call Path.GetFullPath/TrimEnd/OS-platform recomputation inside Retry's artifact-recovery loops (up to 10,000 manifest records / per-artifact) — fixed this run (draft PR above, ~20x faster/100% less alloc per call, measured). TestCaseExtensions.ToUnitTestElementWithUpdatedSource's Traits double-enumeration and TestContextImplementation.SanitizeTestTempDirectoryName's uncached Path.GetInvalidFileNameChars() both fixed and merged (PRs #11452, #11554). Assert.HasCount/IsEmpty/ContainsSingle/CollectionAssert.AreEquivalent/AreNotEquivalent LINQ-Count()-fast-path family fully merged (incl. maintainer dedup PR #11363). src/Analyzers/MSTest.Analyzers/.CodeFixes exhaustively reviewed, no open items. AzureDevOpsResultIdStore min/max single-pass fix confirmed present in main. Microsoft.Testing.Extensions.Retry (hot path), src/TestFramework/TestFramework/Assertions (drift), CtrfReport/JUnitReport, HangDump, CrashDump, AzureFoundry, Microsoft.Testing.Platform/ServerMode JSON-RPC serializer, MtpServerProcess/ServerTestHost partials, the AzureDevOpsTestResultsPublisher.* partials, MSTest.Windows.UIAutomation, the OTel activity-context consumer dedup, Assert.That's IL-compile fast path, the split DotnetMuxerLocator* files, the new composable test-host orchestrator middleware pipeline, HotReload's base-request reuse, IPC deserialization hardening, and diagnostic-logging exposure were all freshly scanned — all already well-optimized except the one fix above. Most easily-reachable low-hanging fruit across the codebase now appears picked, but genuinely new code (like this run's Retry finding) can still surface real opportunities — fresh-code drift checks remain worthwhile even as folder-by-folder first passes wind down.

Repo continues to be actively self-optimized by maintainers/Copilot coding agent. A separate [perf-improver] agent (issue #10914) is also actively working this repo's performance backlog — worth cross-checking before implementing overlapping items (the 2026-09-26/27 Path.GetInvalid*Chars() caching fixes in two different files, by this agent and [perf-improver], both merged the same day — confirms both agents converge on real, low-risk opportunities).

Discovered Commands

Command	Purpose
./build.sh	Full restore + build (installs SDK to .dotnet/ first)
./build.sh -test	Run unit tests
./build.sh -pack	Build + produce NuGet packages
./build.sh -pack -test -integrationTest	Full pipeline incl. acceptance tests
.dotnet/dotnet build <proj>.csproj -c Debug -f <tfm>	Build a single project directly once SDK is bootstrapped
artifacts/bin/<Project>/Debug/<tfm>/<Assembly> (run directly)	Run a built test-host binary — more reliable than dotnet test/dotnet run --project in this sandbox for filter flags
<host> --filter "FullyQualifiedName~Name"	vstest-style substring filter that works reliably against a built MTP test host in this sandbox (--treenode-filter syntax proved finicky)
dotnet format whitespace TestFx.slnx --verify-no-changes --include <file>	Format verification (needs explicit TestFx.slnx workspace arg)

Notes: repo-local SDK at .dotnet/dotnet (Arcade-provisioned, must bootstrap via ./build.sh first, ~5-6 min first time). Some internal classes are tracked by the PublicAPI analyzer via a separate InternalAPI/InternalAPI.Shipped.txt+.Unshipped.txt pair (distinct from PublicAPI/) for cross-assembly InternalsVisibleTo test usage — check for this folder before changing an internal method's signature. Files edited with a text-editing tool can lose their required UTF-8 BOM — always verify/restore the BOM on .cs files before running dotnet format. MSTestAdapter.PlatformServices.UnitTests/MSTestAdapter.UnitTests (net462;net48;net8.0;net9.0 multi-target) cannot be restored/run in this Linux sandbox (no .NET Framework SDK) — document as a Test Status gap rather than attempting a partial-TFM restore workaround (that workaround corrupts sibling projects' project.assets.json).

Run History

2026-09-30 22:15 UTC - Run

• 🔧 Created PR: hoisted PathContainment prefix normalization (and cached the Windows OS-platform check) out of two Retry artifact-recovery hot loops (CollectRecoveredArtifacts, RemoveArtifactsOutsideControllerRoots).
• 📊 Measured: ~20x faster (276ms→14ms/2M calls), 100% allocation eliminated per call (88.0B→0.0B), confirmed via isolated micro-benchmarks that Path.GetFullPath/TrimEnd/concat (not the OS-platform check) was the bottleneck.
• 🔍 Background-scanned 6 freshly-landed areas (composable test-host orchestrator middleware Add composable test-host orchestrator middleware #11607/[code-simplifier] Deduplicate accepted-child-await guard in middleware pipeline #11661, HotReload base-request reuse Reuse base request execution in hot reload #11646, IPC deserialization hardening Harden dotnet test IPC deserialization #11649, Retry path-containment consolidation Consolidate Retry path-containment logic #11575 — source of the fix above, diagnostic-logging exposure Expose diagnostic logging information to extensions #11653); 5/6 already optimal.
• 💬 Re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824/Show slowest tests #3495 — no new human activity, not re-engaged. No new efficiency/performance-labeled issues found.
• 🌱 GSF principle applied: Energy Proportionality (CPU work now scales only with new input, not loop-invariant recomputation).

2026-09-27 21:43 UTC - Run

• ✅ Confirmed efficiency/test-temp-dir-invalidchars-cache merged as PR [efficiency-improver] Cache Path.GetInvalidFileNameChars() in TestContextImplementation temp-dir sanitization #11554 (2026-09-27T13:10Z).
• 🔍 Background-scanned 4 freshly-landed areas (MSTest.Windows.UIAutomation new project, OTel activity-context consumer dedup, Assert.That IL-compile fast path, DotnetMuxerLocator* split) — 0 genuine HIGH/MEDIUM findings; 1 LOW-confidence cold-path lead declined (see backlog).
• 💬 Re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824/Show slowest tests #3495 — no new human activity, not re-engaged. No new efficiency/performance-labeled issues found.
• 📊 No PR created this run — consistent with the codebase's low-hanging fruit being largely picked.

2026-09-26 21:42 UTC - Run

• 🔧 Created PR: cached Path.GetInvalidFileNameChars() in TestContextImplementation.SanitizeTestTempDirectoryName (merged as [efficiency-improver] Cache Path.GetInvalidFileNameChars() in TestContextImplementation temp-dir sanitization #11554).
• 📊 Measured: ~10% faster, ~15% less allocation (2M-iteration benchmark).
• 🔍 Scanned newly-split AzureDevOpsTestResultsPublisher.* partials, OTel provider-independent-diagnostics (Add provider-independent testing platform diagnostics #11521), executable-condition analyzer family — all already optimal.
• 💬 Re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824/Show slowest tests #3495 — no new activity, not re-engaged.

2026-09-25 (prior runs, condensed)

• Confirmed efficiency/jsonwriter-static-dispatch-table-* merged as PR [efficiency-improver] Make Jsonite JsonWriter's type-dispatch table static (avoid per-call Dictionary+closures) #11522 (Jsonite JsonWriter static dispatch table). Scanned new OTel activity-correlation feature and RpcIdParser — already well-optimized.

2026-09-24

• 🔧 Created PR (merged as [efficiency-improver] Make Jsonite JsonWriter's type-dispatch table static (avoid per-call Dictionary+closures) #11522): hoisted Jsonite JsonWriter's per-call Dictionary<Type, Action<object>> closures to a static readonly dispatch table, eliminating per-call allocation on the net462/netstandard2.0 server-mode path.

2026-09-23

• 🔍 Scanned HangDump/CrashDump/AzureFoundry — one plausible lead (CrashDumpSequenceLogger AutoFlush=true) declined as intentional crash-safety design, not an inefficiency.
• 🧹 Fixed a recurrence of the "duplicate Monthly Activity sections" process bug in this issue.

2026-09-22

• 📊 Measured-and-reverted: RetryArgumentsBuilder List<int>→HashSet<int> conversion — benchmarked as NOT a reliable win at real bounded size (~4-10 entries), reverted via git checkout.
• 🔍 Drift-scanned Microsoft.Testing.Extensions.Retry, TestFramework/Assertions, CtrfReport/JUnitReport — 0 new findings.

(Older run history condensed into memory.md to keep this issue readable — see repo memory for full detail back to 2026-06.)

Warning

Firewall blocked 96 domains

The following domains were blocked by the firewall during workflow execution:

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To allow these domains, add them to the network.allowed list in your workflow frontmatter:

network:
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See Network Configuration for more information.

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---

Closing this out — September has ended. Final state: the one open PR tracked here (efficiency/retry-pathcontainment-hoist-normalization, #11671) merged 2026-10-01. 0 open [efficiency-improver] PRs remain. Continuing activity tracking in the new [efficiency-improver] Monthly Activity 2026-10 issue.

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[github-actions]

Efficiency Improver — 2026-09-17 run update (posted as a comment because this run's single update_issue call was used to close the duplicate tracker #10917; the full rewrite will be applied to this issue's body on the next run)

This run's activity

• Task 4: Confirmed both previously-open PRs have landed: efficiency/assert-count-fastpath → merged as maintainer PR Optimize generic assertion count paths #11326 ("Optimize generic assertion count paths"); efficiency/collectionassert-equivalence-fastpath → merged as maintainer PR Add ICollection fast path for CollectionAssert equivalence counts #11353 ("Add ICollection fast path for CollectionAssert equivalence counts"). 0 open efficiency-improver PRs remain.
• Task 2/3: Ran drift re-scans of src/Adapter/MSTestAdapter.PlatformServices+MSTest.TestAdapter and Microsoft.Testing.Extensions.TrxReport/CrashDump/HangDump — both confirmed clean, no new HIGH/MEDIUM findings. No new PR created this run.
• Task 5: Re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824 and Show slowest tests #3495 — no new human activity since last review; not re-engaged (anti-spam).
• Task 7 (duplicate cleanup): Discovered and closed a duplicate Monthly Activity issue — [efficiency-improver] Monthly Activity 2026-09 #10917 (created 2026-09-01, stale since 2026-09-02) was a duplicate of this issue ([efficiency-improver] Monthly Activity 2026-09 #11023, created 2026-09-03, actively maintained). Closed [efficiency-improver] Monthly Activity 2026-09 #10917 with a pointer to this issue.

Suggested Actions for Maintainer

No suggested actions at this time — both prior PRs have already merged.

Run History (new entry, prepend on next full rewrite)

2026-09-17 21:47 UTC - Run

• 🔍 Confirmed both efficiency/assert-count-fastpath (→ Optimize generic assertion count paths #11326) and efficiency/collectionassert-equivalence-fastpath (→ Add ICollection fast path for CollectionAssert equivalence counts #11353) merged.
• 🔍 Drift-rescanned src/Adapter/MSTestAdapter.PlatformServices/MSTest.TestAdapter and TrxReport/CrashDump/HangDump — no new findings.
• 🧹 Closed duplicate tracker [efficiency-improver] Monthly Activity 2026-09 #10917 (superseded by this issue).
• 💬 Re-checked [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824/Show slowest tests #3495 — no new activity, not re-engaged.

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