GROOVY-10307: backport JMH benchmarks from master to Groovy 5

[jamesfredley]

Summary

Backport JMH benchmarks for invokedynamic performance patterns and Grails-like workload simulations from master to the GROOVY_5_0_X branch, enabling performance comparison testing on Groovy 5. Companion to #2393 (which targets GROOVY_4_0_X).

The benchmark sources are taken from the latest master content (15+ follow-up fixes after the original GROOVY-10307 commit, including the SwitchPoint invalidation regression suite and Copilot review feedback).

Changes

New JMH benchmarks (16 files)

Core Groovy performance (org.apache.groovy.perf):

• ClosureBench - closure creation, reuse, capture, delegation, nesting, currying, composition, trampoline, collection operations
• GStringBench - GString interpolation, concatenation, lazy evaluation
• GroovyIdiomBench - Groovy idioms (safe navigation, elvis, spread, with/tap, destructuring)
• LoopsBench - for/while/each/times/upto loop patterns
• MetaclassBench - dynamic method dispatch overhead with metaclass changes
• MethodInvocationBench - method dispatch (instance, static, overloaded, polymorphic, interface, dynamic)
• OperatorBench - operator overloading, comparisons, range operations
• PropertyAccessBench - property get/set patterns (direct, dynamic, nested)
• RunnerRegistryBench - GroovyRunnerRegistry iterator performance

Grails-like patterns (org.apache.groovy.perf.grails):

• CallSiteInvalidationBench - SwitchPoint invalidation overhead for cross-type and same-type metaclass changes
• CategoryBench - category usage patterns (single, nested, simultaneous, shadowing)
• DynamicDispatchBench - methodMissing, propertyMissing, invokeMethod, ExpandoMetaClass injection
• GrailsLikePatternsBench - composite patterns (service chains, controller actions, domain validation, config DSL, markup builder, full request cycle)
• GrailsWorkloadBench - collection closure chains, spread operator, nested closure delegation, GString interpolation, project metrics aggregation
• MetaclassChangeBench - metaclass modification impact (expando additions, replacements, multi-class cascade, burst/steady-state, closure dispatch)
• MetaclassVariationBench - per-instance ExpandoMetaClass overhead (GORM domain class enhancement pattern)

Build changes

• Updated org.apache.groovy-performance.gradle to support indy property for toggling invokedynamic mode in JMH compilation (-Pindy=true|false, defaults to true)
• Added jmh task input tracking and jmhJar output configuration
• Migrated the performance subproject from JUnit 4 to JUnit 5 (using versions.junit5 / versions.junit5Platform since GROOVY_5_0_X does not yet define junit6)
• Updated DummyTest.groovy to use org.junit.jupiter.api.Test

CI workflows

• groovy-jmh.yml - runs JMH benchmarks with invokedynamic enabled (matrix: bench, core, grails suites)
• groovy-jmh-classic.yml - runs JMH benchmarks with classic (non-indy) bytecode

Groovy 5 compatibility adaptation

• DynamicDispatchBench: moved DynamicFinder, DynamicProperties, and MethodInterceptor from static inner classes to package-level classes because Groovy 5 does not support methodMissing/propertyMissing on static inner classes (same adaptation as GROOVY-10307: backport JMH benchmarks from master to Groovy 4 #2393, since the compiler restriction applies to both Groovy 4 and Groovy 5; master allows this on Groovy 6).

Verification

• ./gradlew :performance:jmhClasses (indy mode) - BUILD SUCCESSFUL
• ./gradlew :performance:jmhClasses -Pindy=false (classic mode) - BUILD SUCCESSFUL
• ./gradlew :performance:jmh -PbenchInclude=GroovyIdiomBench.elvis - 3 elvis benchmarks completed successfully producing valid JMH output
• ./gradlew :performance:test - BUILD SUCCESSFUL (verifies the JUnit 5 migration)

[Copilot]

Pull request overview

Backports the GROOVY-10307 JMH benchmark suite (core Groovy + Grails-like patterns) onto the Groovy 5 branch and wires up build/CI support to run the benchmarks in indy vs classic mode for performance comparisons.

Changes:

• Adds new JMH benchmarks under subprojects/performance/src/jmh/groovy covering invokedynamic/metaclass invalidation patterns and common Groovy idioms.
• Updates the performance build logic to support -Pindy=true|false, JMH input tracking, and migrates the performance test setup from JUnit 4 to JUnit 5.
• Adds GitHub Actions workflows to run the JMH suites in indy and classic modes.

Reviewed changes

Copilot reviewed 20 out of 20 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
subprojects/performance/src/test/groovy/DummyTest.groovy	Switches the placeholder test to JUnit Jupiter.
build-logic/src/main/groovy/org.apache.groovy-performance.gradle	Adds JUnit 5 deps, indy toggle for JMH Groovy compilation, and JMH task input/output wiring.
.github/workflows/groovy-jmh.yml	New CI workflow to run JMH suites with indy enabled and upload results.
.github/workflows/groovy-jmh-classic.yml	New CI workflow to run JMH suites with indy disabled and upload results.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/ClosureBench.groovy	Adds closure-focused microbenchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/GStringBench.groovy	Adds GString creation/interpolation benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/GroovyIdiomBench.groovy	Adds idiomatic Groovy feature benchmarks (safe-nav, elvis, spread, etc.).
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/LoopsBench.groovy	Adds loop/iteration pattern benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/MetaclassBench.groovy	Adds metaclass-change invalidation benchmark.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/MethodInvocationBench.groovy	Adds method invocation/dispatch benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/OperatorBench.groovy	Adds operator dispatch benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/PropertyAccessBench.groovy	Adds property access pattern benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/RunnerRegistryBench.java	Adds GroovyRunnerRegistry iterator benchmark.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/grails/CallSiteInvalidationBench.groovy	Adds SwitchPoint invalidation workload benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/grails/CategoryBench.groovy	Adds category-scope invalidation benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/grails/DynamicDispatchBench.groovy	Adds methodMissing/propertyMissing/invokeMethod dispatch benchmarks (Groovy 5-compatible layout).
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/grails/GrailsLikePatternsBench.groovy	Adds composite “Grails-like” pattern workloads.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/grails/GrailsWorkloadBench.groovy	Adds workload-style Grails demo-app pattern benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/grails/MetaclassChangeBench.groovy	Adds metaclass churn / invalidation cascade benchmarks.
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/grails/MetaclassVariationBench.groovy	Adds per-instance ExpandoMetaClass variation benchmarks.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 67.1396%. Comparing base (fb2164b) to head (b503135).

Additional details and impacted files

@@                Coverage Diff                @@
##             GROOVY_5_0_X      #2494   +/-   ##
=================================================
  Coverage         67.1396%   67.1396%           
+ Complexity          29435      29434    -1     
=================================================
  Files                1382       1382           
  Lines              116797     116797           
  Branches            20481      20481           
=================================================
  Hits                78417      78417           
+ Misses              31889      31888    -1     
- Partials             6491       6492    +1     

see 2 files with indirect coverage changes

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