1 /* 2 * Copyright (c) 2014 Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 */ 23 package org.openjdk.bench.java.lang.invoke; 24 25 import org.openjdk.jmh.annotations.Benchmark; 26 import org.openjdk.jmh.annotations.BenchmarkMode; 27 import org.openjdk.jmh.annotations.Mode; 28 import org.openjdk.jmh.annotations.OutputTimeUnit; 29 import org.openjdk.jmh.annotations.Scope; 30 import org.openjdk.jmh.annotations.Setup; 31 import org.openjdk.jmh.annotations.State; 32 33 import java.lang.invoke.MethodHandle; 34 import java.lang.invoke.MethodHandles; 35 import java.lang.invoke.MethodType; 36 import java.util.concurrent.TimeUnit; 37 38 /** 39 * Microbenchmark assesses MethodHandle.asCollector() performance 40 */ 41 @BenchmarkMode(Mode.AverageTime) 42 @OutputTimeUnit(TimeUnit.NANOSECONDS) 43 @State(Scope.Thread) 44 public class MethodHandleAsCollector { 45 46 /* 47 * Implementation notes: 48 * - simple array-parameter method is being called 49 * - baselineRaw calls method directly with dynamically instantiating the array 50 * - baselineCached calls method directly with pre-cached array 51 * - additional testCreate() test harnesses the collector acquisition performance 52 * - testCollector() can be faster than both baselines: it can wrapping array at all 53 */ 54 55 public int i; 56 private static MethodHandle mh; 57 private static MethodHandle collectorMH; 58 private static int[] cachedArgs; 59 60 @Setup 61 public void setup() throws IllegalAccessException, NoSuchMethodException { 62 mh = MethodHandles.lookup().findVirtual(MethodHandleAsCollector.class, "doWork", MethodType.methodType(void.class, int[].class)); 63 collectorMH = mh.asCollector(int[].class, 5); 64 cachedArgs = new int[]{1, 2, 3, 4, 5}; 65 } 66 67 @Benchmark 68 public void baselineMH() throws Throwable { 69 mh.invokeExact(this, new int[] { 1, 2, 3, 4, 5 }); 70 } 71 72 @Benchmark 73 public void baselineMHCached() throws Throwable { 74 mh.invokeExact(this, cachedArgs); 75 } 76 77 @Benchmark 78 public void baselineRaw() throws Throwable { 79 doWork(new int[] { 1, 2, 3, 4, 5}); 80 } 81 82 @Benchmark 83 public void baselineRawCached() throws Throwable { 84 doWork(cachedArgs); 85 } 86 87 @Benchmark 88 public MethodHandle testCreate() { 89 return mh.asCollector(int[].class, 5); 90 } 91 92 @Benchmark 93 public void testCollector() throws Throwable { 94 collectorMH.invokeExact(this, 1, 2, 3, 4, 5); 95 } 96 97 public void doWork(int[] args) { 98 for (int a : args) { 99 i += a; 100 } 101 } 102 103 }