jamesfredley commented on code in PR #2494:
URL: https://github.com/apache/groovy/pull/2494#discussion_r3143921662


##########
.github/workflows/groovy-jmh-classic.yml:
##########
@@ -0,0 +1,62 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: jmh-classic
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    if: >-
+      contains(github.event.head_commit.message || '', 'GROOVY-') ||
+      contains(github.event.pull_request.title || '', 'GROOVY-')
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - suite: bench
+            pattern: '\\.bench\\.'
+          - suite: core
+            pattern: '\\.perf\\.[A-Z]'
+          - suite: grails
+            pattern: '\\.perf\\.grails\\.'
+    runs-on: ubuntu-latest
+    env:
+      DEVELOCITY_ACCESS_KEY: ${{ secrets.DEVELOCITY_ACCESS_KEY }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-java@v5
+        with:
+          distribution: 'zulu'
+          java-version: 21
+          check-latest: true
+      - uses: 
gradle/actions/setup-gradle@0723195856401067f7a2779048b490ace7a47d7c # v5.0.2
+      - name: JMH (${{ matrix.suite }} classic)
+        run: ./gradlew perf:jmh -PbenchInclude=${{ matrix.pattern }} 
-Pindy=false
+        timeout-minutes: 60
+      - name: Rename JMH result file
+        run: |
+          mv subprojects/performance/build/results/jmh/results.txt \
+             subprojects/performance/build/results/jmh/results-${{ 
matrix.suite }}.txt
+
+      - name: Upload reports-jmh-classic-${{ matrix.suite }}
+        uses: actions/upload-artifact@v7

Review Comment:
   Done in b5031358 - aligned with `actions/upload-artifact@v4` to match the 
rest of the GROOVY_5_0_X workflows. Thanks!



##########
.github/workflows/groovy-jmh.yml:
##########
@@ -0,0 +1,62 @@
+# Licensed to the Apache Software Foundation (ASF) under one or more
+# contributor license agreements.  See the NOTICE file distributed with
+# this work for additional information regarding copyright ownership.
+# The ASF licenses this file to You under the Apache License, Version 2.0
+# (the "License"); you may not use this file except in compliance with
+# the License.  You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+name: jmh
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  test:
+    if: >-
+      contains(github.event.head_commit.message || '', 'GROOVY-') ||
+      contains(github.event.pull_request.title || '', 'GROOVY-')
+    strategy:
+      fail-fast: false
+      matrix:
+        include:
+          - suite: bench
+            pattern: '\\.bench\\.'
+          - suite: core
+            pattern: '\\.perf\\.[A-Z]'
+          - suite: grails
+            pattern: '\\.perf\\.grails\\.'
+    runs-on: ubuntu-latest
+    env:
+      DEVELOCITY_ACCESS_KEY: ${{ secrets.DEVELOCITY_ACCESS_KEY }}
+    steps:
+      - uses: actions/checkout@v6
+      - uses: actions/setup-java@v5
+        with:
+          distribution: 'zulu'
+          java-version: 21
+          check-latest: true
+      - uses: 
gradle/actions/setup-gradle@0723195856401067f7a2779048b490ace7a47d7c # v5.0.2
+      - name: JMH (${{ matrix.suite }})
+        run: ./gradlew perf:jmh -PbenchInclude=${{ matrix.pattern }}
+        timeout-minutes: 60
+      - name: Rename JMH result file
+        run: |
+          mv subprojects/performance/build/results/jmh/results.txt \
+             subprojects/performance/build/results/jmh/results-${{ 
matrix.suite }}.txt
+
+      - name: Upload reports-jmh-${{ matrix.suite }}
+        uses: actions/upload-artifact@v7

Review Comment:
   Done in b5031358 - aligned with `actions/upload-artifact@v4` to match the 
rest of the GROOVY_5_0_X workflows. Thanks!



##########
subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/OperatorBench.groovy:
##########
@@ -0,0 +1,207 @@
+/*
+ *  Licensed to the Apache Software Foundation (ASF) under one
+ *  or more contributor license agreements.  See the NOTICE file
+ *  distributed with this work for additional information
+ *  regarding copyright ownership.  The ASF licenses this file
+ *  to you under the Apache License, Version 2.0 (the
+ *  "License"); you may not use this file except in compliance
+ *  with the License.  You may obtain a copy of the License at
+ *
+ *    http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing,
+ *  software distributed under the License is distributed on an
+ *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ *  KIND, either express or implied.  See the License for the
+ *  specific language governing permissions and limitations
+ *  under the License.
+ */
+package org.apache.groovy.perf
+
+import org.openjdk.jmh.annotations.*
+import org.openjdk.jmh.infra.Blackhole
+
+import java.util.concurrent.TimeUnit
+
+/**
+ * Tests the performance of Groovy operator overloading. In Groovy every
+ * operator (+, -, *, /, [], <<, ==, <=>) compiles to a method call
+ * (plus, minus, multiply, div, getAt, leftShift, equals, compareTo)
+ * dispatched through invokedynamic.
+ */
+@Warmup(iterations = 3, time = 2, timeUnit = TimeUnit.SECONDS)
+@Measurement(iterations = 5, time = 2, timeUnit = TimeUnit.SECONDS)
+@Fork(2)
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.MILLISECONDS)
+@State(Scope.Thread)
+class OperatorBench {
+    static final int ITERATIONS = 1_000_000
+
+    /**
+     * Integer addition — dispatches to Integer.plus(Integer).
+     */
+    @Benchmark
+    void integerPlus(Blackhole bh) {
+        int sum = 0
+        for (int i = 0; i < ITERATIONS; i++) {
+            sum = sum + i
+        }
+        bh.consume(sum)
+    }
+
+    /**
+     * Integer multiplication — dispatches to Integer.multiply(Integer).
+     * Uses modulo to keep operands small and avoid overflow to zero.
+     */
+    @Benchmark
+    void integerMultiply(Blackhole bh) {
+        int product = 1
+        for (int i = 1; i < ITERATIONS; i++) {
+            product = (i % 100) * (i % 50)
+        }
+        bh.consume(product)

Review Comment:
   Good catch - fixed in b5031358. Updated the comment to accurately describe 
what the loop does (assignment of bounded operands, not an accumulating 
product). The benchmark behavior is unchanged.



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