[perf-improver] Monthly Activity 2026-07

[github-actions]

Activity for July 2026

Suggested Actions for Maintainer

• Review PR #aw_clone_alloc: perf: skip intermediate Dictionary alloc in CloneForDataDrivenIteration — Review
• Review PR #aw_tcs_fast: perf: skip TCS bridge in ExecuteTestAsync when no ExecutionContext — Review
• Close issue [perf-improver] perf: skip intermediate Dictionary alloc in CloneForDataDrivenIteration #9602: superseded by PR #aw_clone_alloc (same change, new PR) — View
• Close issue [perf-improver] perf: skip TaskCompletionSource bridge in ExecuteTestAsync when no ExecutionContext #9603: superseded by PR #aw_tcs_fast (same change, new PR) — View

Performance Opportunities Backlog

1. [PR submitted] Skip intermediate Dictionary alloc in CloneForDataDrivenIteration — saves 1 alloc per data-driven iteration
2. [PR submitted] Skip TaskCompletionSource bridge in ExecuteTestAsync when capturedContext==null — saves ~3 allocs per test in the common case
3. AntiTerminal.StopUpdate() — _stringBuilder.ToString() on every flush; blocked on IConsole/netstandard2.0. Low priority.
4. SilenceDrivenHeartbeatRenderer — allocations only on rare heartbeat paths. Low priority.
5. ClassifyOutcome in TestResultCaptureHelper.cs — Array.IndexOf fallback for CancelledTestNodeStateProperty. Very low priority.

Discovered Commands

# Build all projects (Debug)
./build.sh

# Build + run unit tests
./build.sh -test

# Pack NuGet packages (required before acceptance tests and performance runner)
./build.sh -pack

# Run acceptance integration tests (requires -pack first)
./build.sh -pack -test -integrationTest

# Run performance timing scenarios (requires -pack first)
.dotnet/dotnet run --project test/Performance/MSTest.Performance.Runner \
  -- execute --pipelineNameFilter "*PlainProcess*"

# Run a single test project
.dotnet/dotnet run --project <project-path> -f net9.0 --no-build -- --treenode-filter "*/*/MyTestClass/*"

Run History

2026-07-05 14:07 UTC - Run

• 📋 Task 4: Discovered that the 2026-07-04 PRs were blocked by GitHub Actions permission constraints — converted to issues [perf-improver] perf: skip intermediate Dictionary alloc in CloneForDataDrivenIteration #9602 and [perf-improver] perf: skip TaskCompletionSource bridge in ExecuteTestAsync when no ExecutionContext #9603 instead
• 🔧 Task 3 (re-submit): PR #aw_clone_alloc on branch perf-assist/skip-clone-dict-alloc — skip intermediate Dictionary alloc in CloneForDataDrivenIteration; saves 1 alloc per data-driven test iteration
• 🔧 Task 3 (re-submit): PR #aw_tcs_fast on branch perf-assist/skip-tcs-no-exec-context — skip TCS bridge in ExecuteTestAsync when capturedContext==null; saves ~3 allocs per test in common case
• 📋 Task 7: Updated monthly activity issue

2026-07-04 14:03 UTC - Run

• 📋 Task 4: Confirmed no open [perf-improver] PRs — previous run's PRs (2026-07-03) were never created due to agentic workflow auth bug (id-token:read, fixed by PR Fix invalid id-token: read in agentic workflow permissions #9577)
• 🔧 Task 3: Attempted PR for skip intermediate Dictionary alloc in CloneForDataDrivenIteration → fell back to issue [perf-improver] perf: skip intermediate Dictionary alloc in CloneForDataDrivenIteration #9602 (GitHub Actions lacks PR create permission)
• 🔧 Task 3: Attempted PR for skip TCS bridge in ExecuteTestAsync when capturedContext==null → fell back to issue [perf-improver] perf: skip TaskCompletionSource bridge in ExecuteTestAsync when no ExecutionContext #9603 (GitHub Actions lacks PR create permission)
• 📋 Task 7: Closed June 2026 issue [perf-improver] Monthly Activity 2026-06 #9258; created this July 2026 monthly activity issue

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