[efficiency-improver] Monthly Activity 2026-06

[Evangelink]

Activity for June 2026

Suggested Actions for Maintainer

• Review draft PR #aw_pr_summary: Single-pass aggregation in AppendTestRunSummary — replaces 7 LINQ calls (Sum×5, Any×1, Count×1) over the assemblies list with one foreach, saving 6 extra O(N) passes and 6 enumerator allocations per test run. - Review

(Previous efficiency PRs #8692–#9300 are all merged — nothing else pending.)

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
LOW	Code-Level	TerminalTestReporter.cs:68 — TotalTests property calls _assemblies.Values.Sum() on every access; could be incrementally tracked. Callers are rare so impact is negligible.	Negligible
LOW	Code-Level	ToolsTestHost.cs:55 — GroupBy().Where(Count()>1) at startup only	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; do not use /usr/bin/dotnet for SDK commands)
• --no-restore flag is broken (unknown MSBuild switch); always run with full restore
• MSTestAdapter internal-framework tests are not run by the MTP runner; CI covers them separately

Run History

2026-06-22 22:21 UTC - Run

• 🔍 Task 4: Verified no open efficiency-improver PRs — previous efficiency/fix-parseoption-hot-loops branch was never pushed; CommandLineParseResult.cs already has the optimized code in main
• 🔍 Task 2: Scanned for new opportunities; confirmed PropertyBag hot-paths fully optimized across all report extensions; found 7-pass LINQ aggregation in AppendTestRunSummary (TerminalTestReporter.Summary.cs)
• 🔧 Submitted draft PR #aw_pr_summary (efficiency/single-pass-summary-aggregation): replace 7 separate LINQ calls (Sum×5, Any×1, Count×1) with single foreach — saves 6 extra passes + 6 LINQ enumerator allocations per end-of-run summary render
• 📊 Proxy metric: LINQ enumerator allocation count + iteration count at test-run end
• 🌱 GSF principle: Hardware Efficiency — fewer managed allocations per run reduces GC pressure

2026-06-21 UTC - Run

• ✅ Confirmed PR [efficiency-improver] perf: avoid GroupBy lazy evaluation for empty-check in AppendTestRunSummary #9300 merged (avoid GroupBy lazy evaluation for empty-check in AppendTestRunSummary)
• 🔍 Scanned codebase for new opportunities; found two hot-path inefficiencies in CommandLineParseResult
• 🔧 Submitted draft PR (branch efficiency/fix-parseoption-hot-loops): hoist Trim() + single-pass foreach in CommandLineParseResult.IsOptionSet and TryGetOptionArgumentList

2026-06-20 22:02 UTC - Run

• ✅ Confirmed PR [efficiency-improver] perf: single-pass GroupBy partition in TestExecutionManager parallelization #9274 merged (single-pass GroupBy partition in TestExecutionManager.Parallelization.cs)
• 🔧 Submitted draft PR → PR [efficiency-improver] perf: avoid GroupBy lazy evaluation for empty-check in AppendTestRunSummary #9300: replace artifactGroups.Any() with _artifacts.Count > 0 in AppendTestRunSummary

2026-06-19 UTC - Run

• 🔍 Scanned MSTest core, Adapter, and Platform for new efficiency opportunities
• ✅ Confirmed PR [efficiency-improver] perf: defer GetTestName() to failure branches and avoid OfType<> alloc in AzureDevOpsReporter #9196 merged (AzureDevOpsReporter defer GetTestName fix)
• 🔧 Submitted PR [efficiency-improver] perf: single-pass GroupBy partition in TestExecutionManager parallelization #9274: single-pass GroupBy partition in TestExecutionManager.Parallelization.cs

2026-06-16 UTC - Run

• 🔍 Scanned AzureDevOpsReporter, DiscoveredTestsJsonSerializer for efficiency opportunities
• 🔧 Created PR [efficiency-improver] perf: defer GetTestName() to failure branches and avoid OfType<> alloc in AzureDevOpsReporter #9196: defer GetTestName() to failure branches + avoid OfType<> alloc in AzureDevOpsReporter

2026-06-15 UTC - Run

• 🔧 Created PR [efficiency-improver] perf: single-pass PropertyBag walk in DiscoveredTestsJsonSerializer #9162: single-pass PropertyBag walk in DiscoveredTestsJsonSerializer

2026-06-14 UTC - Run

• 🔧 Created PR [perf-improver] perf: single-pass PropertyBag walk in TerminalOutputDevice and SimplifiedConsoleOutputDeviceBase #9159: single-pass PropertyBag walk in TerminalOutputDevice and SimplifiedConsoleOutputDeviceBase

2026-06-10 UTC - Run

• 🔧 Created PR [efficiency-improver] perf: single-pass PropertyBag walk in JUnitReport TestResultCapture #9018: single-pass PropertyBag walk in JUnitReport TestResultCapture

Earlier runs (2026-06-01 to 2026-06-09)

• 🔧 PRs [efficiency-improver] perf: reduce redundant UTF-8 encoding in IPC BaseSerializer WriteField #8692, [efficiency-improver] perf: avoid double IEnumerable enumeration in DynamicDataShouldBeValidAnalyzer #8705, [efficiency-improver] perf: encode JSON body once in TcpMessageHandler.WriteRequestAsync #8720, [efficiency-improver] perf: single-pass TRX message partitioning in TrxReportEngine #8743, [efficiency-improver] perf: single-pass TestNode property serialization in SerializerUtilities #8806, [efficiency-improver] perf: cache newline+color string in SimpleAnsiTerminal #8834, [efficiency-improver] perf: cache ExecutionId and single-pass property scan in DotnetTestDataConsumer #8866, [efficiency-improver] perf: use SingleOrDefault(T) instead of OfType(T)().FirstOrDefault() in AzureDevOps report #8884, [efficiency-improver] perf: use SingleOrDefault instead of OfType().Select() for stdout/stderr in OpenTelemetryResultHandler #8908, [efficiency-improver] perf: single-pass PropertyBag walk in OpenTelemetryResultHandler.HandleTestResult #8938, [efficiency-improver] perf: single-pass PropertyBag walk in TrxTestResultExtractor #8975 — all merged
• Focus: UTF-8 encoding, IPC serialization, TRX/OTel/TrxReport/AzureDevOps/SerializerUtilities single-pass PropertyBag walks, AnsiTerminal string caching

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