[Efficiency Improver] Monthly Activity 2026-05

[Evangelink]

🤖 Daily Efficiency Improver here — I'm an automated AI assistant focused on reducing the energy consumption and computational footprint of this repository.

Activity for May 2026

Suggested Actions for Maintainer

• Review PR [Efficiency Improver] perf: eliminate LINQ closure allocations in TreeNodeFilter #8035 by abdelghani-moussaid: eliminates LINQ closure allocations in TreeNodeFilter — Review
• Review PR [Efficiency Improver] perf: eliminate yield-iterator and GroupBy allocations in IsIgnored() hot path #8195: eliminate yield-iterator and GroupBy allocations in IsIgnored() hot path (called 2× per test execution; ~40,000 fewer objects per 10,000-test run) — Review

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
LOW	Code-Level	PropertyBag.GetEnumerator() returns IEnumerator (boxes struct). Requires breaking public API change — not permitted.	Very low
LOW	Code-Level	TestMethodValidator.IsValid: parameters.Any(p => p.IsOut || p.ParameterType.IsByRef) — discovery path only, likely JIT-cached delegate	Very low

(Most hot-path allocation opportunities in this repo have been addressed by Efficiency Improver PRs, the community PR #8035, and merged PRs. Backlog is low-priority only.)

Discovered Commands

# Build (single project, no signing)
export PATH="$PWD/.dotnet:$PATH"
dotnet restore  -p:SignAssembly=false
dotnet build  -p:TargetFramework=net9.0 --no-restore -p:SignAssembly=false

⚠️ Local agent environment has .NET 11 preview SDK (net8.0/net9.0 targeting packs available). Build verified with 0 warnings.

Run History

2026-05-13 18:11 UTC — Run

• 🔍 Task 4: Checked open Efficiency Improver PRs — PR [Efficiency Improver] perf: eliminate yield-iterator allocations in test execution hot path #8093 merged ✅; PR [Efficiency Improver] perf: eliminate yield-iterator and GroupBy allocations in IsIgnored() hot path #8195 CI in progress, actively handled by Copilot SWE agent (merge conflict resolved + review comments addressed)
• i️ No new PRs created this run; backlog remains low-priority only

2026-05-12 18:11 UTC — Run

• 🔧 Created draft PR (branch: efficiency/optimize-isignored-allocs-1778609590): eliminate yield-iterator and GroupBy allocations in IsIgnored() hot path. Closes [Efficiency Improver] perf: eliminate yield-iterator and GroupBy allocations in IsIgnored() hot path #8159.
• 📊 Measured (proxy: heap allocation count): ~40,000 objects eliminated per 10,000-test run (~1 MB GC pressure reduction)
• 🌱 GSF principle: Hardware Efficiency — fewer allocs = less DRAM & GC CPU per joule
• ✅ Build: 0 warnings, 0 errors (net9.0)

2026-05-12 04:32 UTC — Run

• 🔍 Scanned codebase for new efficiency opportunities; identified IsIgnored() yield-iterator + GroupBy allocation on every test execution
• 🔧 Attempted draft PR (branch push failed, tracking issue [Efficiency Improver] perf: eliminate yield-iterator and GroupBy allocations in IsIgnored() hot path #8143 created)
• 📊 Measured (proxy: heap allocation count): ~40,000 objects eliminated per 10,000-test run (~1 MB GC pressure reduction)
• 🌱 GSF principle: Hardware Efficiency — fewer allocs = less DRAM & GC CPU per joule
• ✅ Build: 0 warnings, 0 errors (net8.0, net9.0)
• i️ PR [Efficiency Improver] perf: avoid iterator allocation in GetRetryAttribute() #8103 was merged (GetRetryAttribute yield-iterator fix). PR [Efficiency Improver] perf: eliminate yield-iterator allocations in test execution hot path #8093 (DataSource + tests) still open for review.

2026-05-11 04:44 UTC — Run

• 🔧 Implemented fix: GetRetryAttribute() + TryExecuteDataSourceBasedTestsAsync() yield-iterator/array allocation elimination on branch efficiency/avoid-yield-iterator-get-retry-attribute
• 📊 Measured (proxy: heap allocation count): 3 allocations eliminated per test execution; ~30,000 allocations eliminated per 10,000-test run
• 🌱 GSF principles: Hardware Efficiency — fewer allocs = less DRAM & GC CPU per joule; Energy Proportionality — GC cost scales with allocation rate
• ✅ Build: 0 warnings, 0 errors (net8.0, net9.0)

2026-05-10 04:38 UTC — Run

• 🔍 Confirmed: no new high-priority opportunities remain; backlog is low-priority only
• 🔧 Created patch efficiency/avoid-yield-iterator-allocs-v4: consolidates GetRetryAttribute + TryExecuteDataSourceBasedTestsAsync yield-iterator fixes
• 📊 Measured (proxy: heap allocation count): ~1.4 MB GC pressure reduction per 10,000-test run
• 🌱 GSF principles: Hardware Efficiency — fewer allocs = less DRAM & GC CPU per joule

2026-05-09 04:27 UTC — Run

• 🔧 Created tracking issue [Efficiency Improver] perf: avoid iterator allocation in GetRetryAttribute() #8073 (branch push failed): perf: avoid iterator allocation in GetRetryAttribute()

2026-05-08 04:24 UTC — Run

• 🔧 Created tracking issue [Efficiency Improver] perf: avoid iterator allocation in GetRetryAttribute() #8063 (branch push failed): perf: avoid iterator allocation in GetRetryAttribute()

2026-05-07 04:31 UTC — Run

• 🔧 Created tracking issue [Efficiency Improver] perf: avoid iterator allocation in GetRetryAttribute() #8040 (branch push failed): perf: avoid iterator allocation in GetRetryAttribute()

2026-05-06 00:00 UTC — Run

• 🔍 Scanned MSTest.Engine, MSTestAdapter.PlatformServices, Microsoft.Testing.Platform for remaining hot-path allocation opportunities
• 🔧 Attempted to create PR perf: avoid iterator allocation in GetRetryAttribute() — branch not persisted

2026-05-05 04:24 UTC — Run

• 🔧 Created PR (branch: efficiency/eliminate-closure-allocs-treenodefilter-v3): Eliminate LINQ closure allocations in MatchFilterPattern/MatchProperties/HasPropertyFilterExpression
• 📊 Measured: ~3–5 heap allocations eliminated per MatchesFilter call

2026-05-01 04:41 UTC — Run

• 🔧 Attempted PR (branch: efficiency/treenodefilter-no-linq-closures): Branch not persisted; re-done in later runs
• 📋 Closed April 2026 activity issue [Efficiency Improver] Monthly Activity 2026-04 #7948, opened May 2026 activity issue

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