8061281: Microbenchmark suite build support, directory layout and sample benchmarks

8061282: Migrate jmh-jdk-microbenchmarks into the JDK

Co-authored-by: Magnus Ihse Bursie <magnus.ihse.bursie@oracle.com>
Co-authored-by: Erik Joelsson <erik.joelsson@oracle.com>
Co-authored-by: Staffan Friberg <sfriberg@kth.se>
Reviewed-by: ecaspole, mchung, erikj, ihse

test/micro/org/openjdk/bench/java/lang/NewInstance.java

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ */
+package org.openjdk.bench.java.lang;
+
+import org.openjdk.jmh.annotations.Benchmark;
+import org.openjdk.jmh.annotations.BenchmarkMode;
+import org.openjdk.jmh.annotations.Mode;
+import org.openjdk.jmh.annotations.OutputTimeUnit;
+import org.openjdk.jmh.annotations.Scope;
+import org.openjdk.jmh.annotations.Setup;
+import org.openjdk.jmh.annotations.State;
+import org.openjdk.jmh.infra.Blackhole;
+
+import java.util.concurrent.TimeUnit;
+
+/**
+ * Benchmark measuring java.lang.Class.newInstance speed.
+ */
+@BenchmarkMode(Mode.AverageTime)
+@OutputTimeUnit(TimeUnit.NANOSECONDS)
+@State(Scope.Thread)
+public class NewInstance {
+
+    public Class<?>[] samePublicClasses;
+    public Class<?>[] differentPublicClasses;
+    public Class<?>[] differentPublicClassesConstant;
+    public Class<?>[] sameProtectedClasses;
+    public Class<?>[] differentProtectedClasses;
+
+    @Setup
+    public void setup() {
+        samePublicClasses = new Class<?>[]{Apub.class, Apub.class, Apub.class};
+        differentPublicClasses = new Class<?>[]{Apub.class, Bpub.class, Cpub.class};
+        differentPublicClassesConstant = new Class<?>[]{Apub.class, Bpub.class, Cpub.class};
+        sameProtectedClasses = new Class<?>[]{Apro.class, Apro.class, Apro.class};
+        differentProtectedClasses = new Class<?>[]{Apro.class, Bpro.class, Cpro.class};
+    }
+
+    /**
+     * Performs Class.newInstance on the same class over and over again. That it is the same class is not provable at
+     * compile time. The class is protected.
+     */
+    @Benchmark
+    public void threeSameProtected(Blackhole bh) throws IllegalAccessException, InstantiationException {
+        for (Class<?> cl : sameProtectedClasses) {
+            bh.consume(cl.newInstance());
+        }
+    }
+
+    /**
+     * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The
+     * classes are all protected.
+     */
+    @Benchmark
+    public void threeDifferentProtected(Blackhole bh) throws IllegalAccessException, InstantiationException {
+        for (Class<?> cl : differentProtectedClasses) {
+            bh.consume(cl.newInstance());
+        }
+    }
+
+    /**
+     * Performs Class.newInstance on the same class over and over again. That it is the same class is not provable at
+     * compile time. The class is public.
+     */
+    @Benchmark
+    public void threeSamePublic(Blackhole bh) throws IllegalAccessException, InstantiationException {
+        for (Class<?> cl : samePublicClasses) {
+            bh.consume(cl.newInstance());
+        }
+    }
+
+    /**
+     * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The
+     * classes are all public.
+     */
+    @Benchmark
+    public void threeDifferentPublic(Blackhole bh) throws IllegalAccessException, InstantiationException {
+        for (Class<?> cl : differentPublicClasses) {
+            bh.consume(cl.newInstance());
+        }
+    }
+
+    /**
+     * Performs Class.newInstance on three different classes, just allocating one instance of one class at a time. The
+     * classes are all public.
+     */
+    @Benchmark
+    public void threeDifferentPublicConstant(Blackhole bh) throws IllegalAccessException, InstantiationException {
+        bh.consume(Apub.class.newInstance());
+        bh.consume(Bpub.class.newInstance());
+        bh.consume(Cpub.class.newInstance());
+    }
+
+    @Benchmark
+    public void threeDifferentPublicFinal(Blackhole bh) throws IllegalAccessException, InstantiationException {
+        for (Class<?> cl : differentPublicClassesConstant) {
+            bh.consume(cl.newInstance());
+        }
+    }
+
+    /* Protected test classes */
+    static class Apro {}
+    static class Bpro {}
+    static class Cpro {}
+
+    /* Public test classes */
+    public static class Apub {}
+    public static class Bpub {}
+    public static class Cpub {}
+
+}