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new b64ca55b38 fix jmh tests (add test showing impact of metaclass changes)
b64ca55b38 is described below
commit b64ca55b3897b02c6e477ce8f7f1a3b7ed1ac048
Author: Paul King <[email protected]>
AuthorDate: Thu Feb 26 14:11:31 2026 +1000
fix jmh tests (add test showing impact of metaclass changes)
---
.../org/apache/groovy/perf/MetaclassBench.groovy | 77 ++++++++++++++++++++++
1 file changed, 77 insertions(+)
diff --git
a/subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/MetaclassBench.groovy
b/subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/MetaclassBench.groovy
new file mode 100644
index 0000000000..b318dcea13
--- /dev/null
+++
b/subprojects/performance/src/jmh/groovy/org/apache/groovy/perf/MetaclassBench.groovy
@@ -0,0 +1,77 @@
+/*
+ * 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.Benchmark
+import org.openjdk.jmh.annotations.BenchmarkMode
+import org.openjdk.jmh.annotations.Fork
+import org.openjdk.jmh.annotations.Measurement
+import org.openjdk.jmh.annotations.Mode
+import org.openjdk.jmh.annotations.OutputTimeUnit
+import org.openjdk.jmh.annotations.Scope
+import org.openjdk.jmh.annotations.State
+import org.openjdk.jmh.annotations.Warmup
+import org.openjdk.jmh.infra.Blackhole
+
+import java.util.concurrent.TimeUnit
+
+/**
+ * Tests the overhead of dynamic method invocation and dispatch in Groovy in
the presence of Metaclass changes.
+ */
+@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 MetaclassBench {
+ static final int ITERATIONS = 100_000
+
+ class Foo {
+ int m0() { 0 }
+ int m1() { 1 }
+ int m2() { 2 }
+ int m3() { 3 }
+ int m4() { 4 }
+ int m5() { 5 }
+ int m6() { 6 }
+ int m7() { 7 }
+ int m8() { 8 }
+ int m9() { 9 }
+ int m10() { 10 }
+ int m11() { 11 }
+ int m12() { 12 }
+ int m13() { 13 }
+ int m14() { 14 }
+ int m15() { 15 }
+ }
+
+ @Benchmark
+ void methodCallsWithMetaclassChanges(Blackhole bh) {
+ long sum = 0
+ for (int i = 0; i < ITERATIONS; i++) {
+ Foo.metaClass."meth${i % 16}" = { -> i }
+ def foo = new Foo()
+ sum += foo.m0() + foo.m1() + foo.m2() + foo.m3() + foo.m4() +
foo.m5() + foo.m6() + foo.m7() +
+ foo.m8() + foo.m9() + foo.m10() + foo.m11() + foo.m12() +
foo.m13() + foo.m14() + foo.m15()
+ }
+ bh.consume(sum)
+ }
+
+}
