[Efficiency Improver] Monthly Activity 2026-04

[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 April 2026

Suggested Actions for Maintainer

• Review PR (efficiency/treenodefilter-no-linq-closures): Eliminate LINQ closure allocations in TreeNodeFilter.MatchFilterPattern and MatchProperties — per-test-node GC pressure reduction
• Review PR [Efficiency Improver] perf: skip PropertyBag construction in BFSTestNodeVisitor when filter has no property expressions #7901: Skip PropertyBag construction in BFSTestNodeVisitor when filter has no property expressions - Review (already merged 2026-04-29 ✅)

Energy Efficiency Backlog

Priority	Focus Area	Opportunity	Estimated Impact
MEDIUM	Code-Level	Scan for more hot-path allocations: MessageBus extension callbacks, terminal reporter inner loops	Medium — depends on test suite complexity
LOW	Code-Level	AbortForMaxFailedTestsExtension: SingleOrDefault<TestNodeStateProperty>() now zero-alloc (already fixed #7857) — verify no other property lookups remain	Low

Discovered Commands

# Build (single project, no signing)
export PATH="$PWD/.dotnet:$PATH"
dotnet restore <project.csproj>
dotnet build <project.csproj> -p:TargetFramework=net8.0 --no-restore -p:SignAssembly=false

# Test (filter by name)
dotnet test <test.csproj> -p:TargetFramework=net8.0 --no-restore --filter "<TestName>" -p:SignAssembly=false

⚠️ Unit test project build fails on this agent's environment with a pre-existing NuGet version mismatch (locally-built 2.3.0.0 vs cached 2.2.1.0). CI runs are authoritative.

Run History

2026-04-30 04:29 UTC — Run

• 🔍 Identified opportunity: LINQ closures in TreeNodeFilter.MatchFilterPattern and MatchProperties allocate per-test-node
• 🔧 Created PR: Eliminate LINQ closure allocations in MatchFilterPattern/MatchProperties (explicit foreach loops, zero closures per node traversal)
• 📊 Measured: ~2 allocs per PropertyExpression evaluation eliminated; closures in Or/And/Not operators eliminated
• 🌱 GSF principle: Energy Proportionality — GC pressure proportional to allocation rate; fewer allocs = less GC CPU burn

2026-04-29 04:28 UTC — Run

• 🔧 Created PR [Efficiency Improver] perf: eliminate yield-iterator state machine in PropertyBag.OfType(T)() #7917 (merged): Eliminate yield-iterator state machine in PropertyBag.OfType<T>()
• 🔧 Updated PR [Efficiency Improver] perf: skip PropertyBag construction in BFSTestNodeVisitor when filter has no property expressions #7901 (merged): Skip PropertyBag construction in BFSTestNodeVisitor when filter has no property expressions
• 📊 Measured: Zero allocations for OfType<T> in common case (no matching property)

2026-04-28 07:18 UTC

• 🔧 Created PR [Efficiency Improver] perf: skip PropertyBag construction in BFSTestNodeVisitor when filter has no property expressions #7901 (merged): Skip PropertyBag construction when filter has no property expressions

2026-04-27 07:53 UTC

• 🔧 Created PR [Efficiency Improver] perf: eliminate state-machine allocations in PropertyBag.Single(T)() and SingleOrDefault(T)() #7857 (merged): Eliminate state-machine allocations in PropertyBag.Single<T>() and SingleOrDefault<T>()

2026-04-25

• 🔧 Created PR [Efficiency Improver] perf: reduce allocations in BFSTestNodeVisitor path tracking and WrappedName building #7836 (merged): Reduce allocations in BFSTestNodeVisitor path tracking and CreateWrappedName

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