[efficiency-improver] Monthly Activity 2026-07

[github-actions]

Activity for July 2026

Suggested Actions for Maintainer

• Open PR from branch efficiency/pass-cached-params-to-invoke: perf: avoid redundant GetParameters() allocations in test-invocation hot path — removes O(N) ParameterInfo[] allocations per data-driven test at the invocation call site; complements perf: reduce allocations in data-driven test execution hot path #9617 — Review | Issue
• Review/merge PR perf: reduce allocations in data-driven test execution hot path #9617: perf: reduce allocations in data-driven test execution hot path (Evangelink's PR combining [perf-improver] perf: skip intermediate Dictionary alloc in CloneForDataDrivenIteration #9602, [perf-improver] perf: skip TaskCompletionSource bridge in ExecuteTestAsync when no ExecutionContext #9603, [efficiency-improver] perf: cache GetParameters() and ReflectionTestMethodInfo across data rows #9605, [efficiency-improver] perf: cache ReflectionTestMethodInfo and GetParameters() across data rows #9593) — Review
• Check comment on Expose programmatic test filtering via ITestFilter (avoid ClassInit cost for filtered-out tests) #8894: Efficiency Improver added energy-efficiency framing — ITestFilter ClassInit waste quantification, TestFilterContext design note, measurement suggestion, GSF Demand Shaping reference - View
• Check comment on [RFC] Agent/LLM-efficient test output for Microsoft.Testing.Platform #8824: Efficiency Improver added energy impact prioritisation for LLM-output RFC proposals — ordered by token reduction, stack-frame filtering highlighted as highest win, suggestion to track output byte count as CI health metric - View
• Review issue [efficiency-improver] Add server-mode (JSON-RPC) performance scenario to nightly perf pipeline #9480: add server-mode (JSON-RPC) performance scenario to nightly pipeline — fills measurement gap for IPC/serializer path targeted by several merged efficiency PRs - View

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
MEDIUM	Infrastructure	Add server-mode (JSON-RPC) perf scenario to nightly pipeline + trend tracking/regression alerting	Baseline visibility for IPC path
LOW	Code-Level	OpenTelemetry: Properties.OfType() in yield iterator method — needs non-iterator helper	Minor
LOW	Code-Level	TerminalTestReporter.cs — TotalTests calls _assemblies.Values.Sum() on every access	Negligible
LOW	Code-Level	PlainProcess.cs: cache JsonSerializerOptions { WriteIndented = true } instance (CA1869 suppressed)	Negligible

Discovered Commands

Command	Purpose	Validated
./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	✅

Notes:

• Local SDK: .dotnet/dotnet (Arcade-provisioned; run ./build.sh first to install)
• --no-restore flag is broken; always run with full restore

Run History

2026-07-08 UTC - Run

• 🔍 Task 4: Verified prior work — PR perf: cache GetParameters() and ReflectionTestMethodInfo across data rows #9614 (merged 2026-07-05) incorporated our GetParameters() caching proposal; PR perf: reduce allocations in data-driven test execution hot path #9617 (open) combines all data-row allocation fixes
• 🔧 Task 3: Submitted efficiency improvement efficiency/pass-cached-params-to-invoke — threads TestMethodInfo.ParameterTypes cache through GetInvokeResultAsync, eliminating O(N) ParameterInfo[] allocs per data-driven run at the invocation call site; also eliminates double-allocation for generic test methods via ConstructGenericMethod; issue filed as #aw_pr_jul3
• 🌱 GSF principle: Hardware Efficiency — reduced GC frequency lowers CPU power draw proportional to data-row count

2026-07-04 21:59 UTC - Run

• 🔧 Submitted draft PR (branch efficiency/cache-getparameters-across-data-rows): cache GetParameters() and ReflectionTestMethodInfo across data rows — 3 changes eliminate O(N) → O(1) ParameterInfo[] allocations per data-driven test; build ✅, unit tests ✅
• 🔍 Identified: TestMethodInfo.ResolveArguments() bypassed ParameterTypes cache added in [efficiency-improver] perf: cache MethodInfo.GetParameters() to avoid per-row array allocations in data-driven tests #9514 (calling MethodInfo.GetParameters() directly)
• 🌱 GSF principle: Hardware Efficiency / Demand Shaping — reduced GC frequency lowers CPU power draw proportionally to row count

2026-07-03 UTC - Run

• ✅ Confirmed PR [efficiency-improver] perf: cache MethodInfo.GetParameters() to avoid per-row array allocations in data-driven tests #9514 merged (2026-06-30): cache MethodInfo.GetParameters() in TestMethodInfo.ParameterTypes + hoist in AssemblyEnumerator.TryUnfoldITestDataSource
• 🔍 Scanned assertion framework, TelemetryCollector, TestMethodRunner, TestDataSourceUtilities: all already well-optimized; no high-priority items found
• 📋 Closed June 2026 monthly summary issue [efficiency-improver] Monthly Activity 2026-06 #9197; created this July 2026 summary
• 🌱 GSF principle: Hardware Efficiency — reduces GC pressure proportional to data-row count

🤖 Automated content by GitHub Copilot. Posted via a maintainer's GitHub token, so it appears under their account — the account owner did not write or approve this content personally. Generated by the Efficiency Improver workflow. · 400.5 AIC · ⌖ 11.3 AIC · ⊞ 13.6K · [◷]( · ◷)

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