perf: shrink generated per-class test source static constructors (~40% less startup JIT) by thomhurst · Pull Request #6859 · thomhurst/TUnit

thomhurst · 2026-09-22T18:37:15Z

Summary

Found while reproducing meziantou's test framework benchmark, where TUnit's per-test cost (42 µs) trailed MSTest (15 µs). A JIT trace of the 10,000-test Bare suite showed that the biggest single cost was JIT-compiling the generated *__TestSource..cctors. Each one was 12.8 KB of IL (≈128 bytes per test), and together the 100 of them took ~1.8 s of JIT thread time. MSTest JITs about the same number of methods, but 550 KB of IL in total against TUnit's 2.3 MB.

Per test, the static constructor contained:

three delegate conversions (ldftn + newobj) for the class-shared __CreateInstance/__Invoke/__Attributes, which also allocated 3 delegates per test
a MethodMetadata static field plus its own MethodMetadataFactory.Create(...) call
(in __Invoke) a separate try/catch per switch case, so 100 EH clauses per method

Changes:

Generator: cache the three delegates once per class in static fields.
Generator + Core: add a TestEntryFactory.Create overload that takes classMetadata (plus optional returnType, genericTypeCount and parameters) and builds the MethodMetadata itself. The per-test __mm_N fields are gone from the per-class path. The existing overload is unchanged; the per-method, generic and inherited paths still use it.
Generator: use one try/catch around the whole __Invoke switch. Behaviour is the same: a synchronous throw still becomes a faulted ValueTask.

Reflection mode doesn't use this code path, so its behaviour doesn't change.

Benchmark

This uses meziantou's harness against locally packed main vs this branch. It measures the MTP executable wall clock: 10 runs after 3 warm-ups, default reporters. Machine: Windows 11, .NET SDK 10.0.401.

Scenario	Tests	main (min / median)	this PR (min / median)
Bare	1,000	414 / 431 ms	397 / 417 ms
Bare	10,000	924 / 1,012 ms	782 / 825 ms
Cold build	10,000	8.77 s	7.87 s

These are deterministic JIT counters for the 10k suite (System.Runtime.JitInfo, reporter disabled):

	main	this PR
JIT-compiled IL	2.31 MB	1.60 MB
JIT time (all threads)	~3.0 s	~1.9 s
`TestSource..cctor` IL (100 tests)	12,791 B	~6,100 B
Σ `TestSource..cctor` JIT time	1,834 ms	~500 ms

Tests

TUnit.Core.SourceGenerator.Tests: snapshots updated and passing on net10.0 and net472 (verified for net8.0 and net9.0 too).
TUnit.PublicAPI: snapshots updated for the new overload. I patched Net4_7 by hand because the net472 PublicAPI run can't resolve netstandard on this machine; it fails the same way on main.
TUnit.TestProject builds with the new generator.
Full TUnit.Engine.Tests run: the failures that remained after rerunning under lower machine load (FSharp, VB, MatrixTests2, 3× Issue6688Tests) fail identically on a main-based build, so this change didn't cause them.

Follow-ups

The data-driven static constructors are still ~17 KB for 100 tests, mostly per-parameter reflectionInfoFactory lambdas and redundant new ConcreteType(typeof(T)). That can be tackled separately because it touches AOT-sensitive reflection.

Summary by CodeRabbit

New Features
- Added a TestEntryFactory option for supplying class-level metadata, return types, generic information, and parameter metadata when creating test entries.
Bug Fixes
- Generated test dispatch now consistently converts invocation and invalid-index errors into faulted asynchronous results, improving error reporting consistency.
Refactor
- Generated tests now reuse shared callbacks and metadata, reducing repeated generated structures while preserving test registration and execution behavior.
Tests
- Updated generated-source verification snapshots across supported frameworks and test scenarios.

Each test in a generated per-class TestSource added three delegate conversions (ldftn/newobj for __CreateInstance, __Invoke and __Attributes), a MethodMetadata static field plus factory call, and its own try/catch in the __Invoke switch. At 10,000 tests this made every TestSource .cctor ~12.8KB of IL and dominated startup JIT time. - Cache the three class-shared delegates in static fields. - Let a new TestEntryFactory.Create overload build the MethodMetadata from the class metadata and return type instead of a per-test static field. - Use one exception handler around the __Invoke switch instead of one per case.

chatgpt-codex-connector · 2026-09-22T18:37:32Z

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coderabbitai · 2026-09-22T18:37:55Z

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📝 Walkthrough

Walkthrough

The source generator now constructs method metadata from shared class metadata and named method arguments. Generated invokers use one exception handler around method dispatch. Generated entries use cached delegates. Verified snapshots and API baselines were updated.

Changes

Generated metadata and invocation

Layer / File(s)	Summary
Metadata construction and dispatch `src/TUnit.Core.SourceGenerator/...`, `src/TUnit.Core.SourceGenerator/Models/...`	The generator removes per-method `MethodMetadata` fields. It emits `returnType`, `genericTypeCount`, and `parameters` arguments. It emits shared instance, invocation, and attribute delegates.
Test entry factory API `src/TUnit.Core/TestEntryFactory.cs`, `tests/TUnit.PublicAPI/...`	`TestEntryFactory.Create<T>` adds an overload that accepts `ClassMetadata` and optional method metadata arguments. The overload creates `MethodMetadata` and forwards to the existing factory path.
Generated source baselines `tests/TUnit.Core.SourceGenerator.Tests/*.verified.txt`	Generated `__Invoke` methods now wrap the complete method-index switch in one `try`/`catch`. Test entries now use inline metadata, shared class metadata, and cached delegates.

Priority: ➖ Normal

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟡 Moderate · up to 84029

Existing consumers that pass null positionally for method metadata can no longer compile after this API addition. Use a non-overlapping overload shape or name before merging.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 3 files. (117 skipped…	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the performance change: reducing generated per-class test-source static-constructor startup JIT cost. It is concise and directly related to the pull request objectives.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

Docstring coverage is 40.00% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 10 functions across 3 files. (117 skipped: 117 unsupported.)

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_{A rabbit checks each generated line
Shared fields now fit and align
One catch guards the switch with care
Metadata blooms from class data there
Delegates wait in a tidy row
Verified snapshots show the flow}

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greptile-apps · 2026-09-22T18:40:29Z

Confidence Score: 5/5

The PR appears safe to merge, with generated metadata and invocation behavior preserved while reducing per-class initialization overhead.

Summary

This PR reduces startup JIT and allocation overhead in source-generated per-class test registration.

Caches class-level creation, invocation, and attribute delegates instead of allocating them for every test entry.
Moves per-method MethodMetadata construction into a shared TestEntryFactory.Create overload.
Consolidates generated invocation exception handling into one handler around the class dispatcher.
Updates generator and public-API snapshots across supported targets.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart LR
  A[Test method symbols] --> B[Per-class source generator]
  B --> C[Shared class metadata]
  B --> D[Shared delegates]
  B --> E[Compact TestEntryFactory calls]
  C --> E
  D --> E
  E --> F[MethodMetadata construction]
  F --> G[TestEntry array]
  G --> H[Runtime discovery and execution]

_{Reviews (1) · Last reviewed commit: "perf: shrink generated per-class test so..."}

github-actions · 2026-09-22T18:44:35Z

Code Review — PR #6859

Reviewed the diff against pr-head/ and traced the generated-output changes through the actual .verified.txt snapshots (not just the generator source).

Summary of the change: Reduces per-class static-constructor overhead in source-generated test registration by caching class-level __CreateInstance/__Invoke/__Attributes delegates once instead of allocating them per test entry, consolidating per-case try/catch blocks into a single try around the __Invoke switch, and routing per-method MethodMetadata construction through a new shared TestEntryFactory.Create overload.

Findings: None that block merge.

Behavior preservation of the consolidated try/catch: InvokeTestAsync (src/TUnit.Core/ExecutableTest\1.cs) is async Task, so a synchronous throw from the default:arm (now inside thetry, previously outside it) and a faulted returned ValueTaskboth converge to the same faultedTask` for the caller. No observable behavior change for callers.
New TestEntryFactory.Create overload: parameter order/defaults (returnType ?? typeof(void)) match MethodMetadataFactory.Create, and the generator only emits returnType:/genericTypeCount:/parameters: when non-default — consistent with the factory's optional-parameter semantics.
Static field ordering in generated code (__classMetadata/__classType → methods → delegate fields → Entries) avoids forward-reference issues in the type initializer.
Dual-mode requirement (AGENTS.md): TUnit.Engine (reflection mode) doesn't reference TestEntryFactory/MethodMetadataFactory, so this is source-generator-only and doesn't need a matching reflection-mode change.
No .received.txt files were committed; TUnit.PublicAPI snapshots only add the new overload without touching the existing one.

Other automated reviewers (Codex, Greptile) also found no issues on this PR; Greptile rated it 5/5 confidence to merge. I independently reached the same conclusion.

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In
`@tests/TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.Net4_7.verified.txt`:
- Around line 1522-1528: Update the new generic Create overload involving
ClassMetadata so it does not overlap the existing MethodMetadata overload for
positional null arguments. Use a distinct method name or otherwise change the
parameter shape, while preserving the existing Create call contract and
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📒 Files selected for processing (120)

src/TUnit.Core.SourceGenerator/Generators/TestMetadataGenerator.cs
src/TUnit.Core.SourceGenerator/Models/TestMethodSourceCode.cs
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tests/TUnit.PublicAPI/Tests.Core_Library_Has_No_API_Changes.Net4_7.verified.txt

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…sMetadata The new Create<T>(..., ClassMetadata, ...) overload overlapped the existing Create<T>(..., MethodMetadata, ...) overload, so positional null calls became ambiguous (CS0121). Give it a distinct name and update the generator and snapshots.

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github-actions · 2026-09-22T20:50:24Z

Code Review — PR #6859

Re-reviewed against the current head (8402943). I independently verified the key correctness claims rather than just checking the diff shape.

Summary: Caches the three per-class delegates (__CreateInstance/__Invoke/__Attributes) once instead of per test entry, consolidates the per-case try/catch in the generated __Invoke switch into a single handler around the whole switch, and moves per-method MethodMetadata construction into a new TestEntryFactory.CreateWithClassMetadata overload so the per-test __mm_N static fields are no longer emitted.

Findings: None that block merge.

Consolidated try/catch is behavior-preserving. __Invoke is a plain (non-async) method, but its only caller, ExecutableTest<T>.InvokeTestAsync (src/TUnit.Core/ExecutableTest\1.cs:67), is async Taskand doesawait indexed(...). Whether the delegate throws synchronously (old per-case handlers, and the default: throw new ArgumentOutOfRangeException, which was already unguarded before this PR) or returns a faulted ValueTask(new shared handler), the async state machine converts both into an equivalent faultedTask for the caller. No observable change, including for the invalid-methodIndex` case.
New overload doesn't collide with the existing one. It's named CreateWithClassMetadata, not an overload of Create — so the CodeRabbit-flagged "positional-null callers become ambiguous" risk doesn't apply; there's no overload-resolution ambiguity to worry about.
PreGenerateMethodMetadataArguments matches the old GenerateMethodMetadataFactoryCall semantics: returnType is omitted for void methods (relying on CreateWithClassMetadata's returnType ?? typeof(void) default, same effective value as before), and genericTypeCount/parameters are emitted only when non-default, reusing the same MetadataGenerationHelper.GenerateParameterMetadataArrayForMethodExpression helper as before.
Spot-checked a generated snapshot (BasicTests.Test.DotNet10_0.verified.txt) end-to-end: field ordering avoids forward references, named arguments line up with the new overload's signature, and the single try/catch correctly wraps all switch cases including default.
No .received.txt files committed; TUnit.PublicAPI snapshots only add the new overload, existing Create overload is untouched.
Per AGENTS.md's dual-mode rule: this only touches TUnit.Core.SourceGenerator codegen and the new TUnit.Core factory it calls — TUnit.Engine (reflection mode) doesn't reference TestEntryFactory, so no matching reflection-mode change is needed.

This matches the conclusion of the earlier automated review on this PR (also no blocking issues); this pass verified the specific claims directly against the code rather than restating them.

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Merge remote-tracking branch 'origin/main' into perf/smaller-generate…

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thomhurst merged commit 0afb5c6 into main Sep 22, 2026
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perf: shrink generated per-class test source static constructors (~40% less startup JIT) - #6859

perf: shrink generated per-class test source static constructors (~40% less startup JIT)#6859
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thomhurst commented Sep 22, 2026 • edited by coderabbitai Bot Loading Uh oh! There was an error while loading. Please reload this page.

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Summary

Benchmark

Tests

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greptile-apps Bot commented Sep 22, 2026

Confidence Score: 5/5

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github-actions Bot commented Sep 22, 2026

Code Review — PR #6859

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github-actions Bot commented Sep 22, 2026

Code Review — PR #6859

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thomhurst commented Sep 22, 2026 •

edited by coderabbitai Bot

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chatgpt-codex-connector Bot commented Sep 22, 2026 •

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