/* * Copyright (c) 2022, 2023, 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.Fork; import org.openjdk.jmh.annotations.Measurement; import org.openjdk.jmh.annotations.Mode; import org.openjdk.jmh.annotations.OperationsPerInvocation; import org.openjdk.jmh.annotations.OutputTimeUnit; import org.openjdk.jmh.annotations.Param; import org.openjdk.jmh.annotations.Scope; import org.openjdk.jmh.annotations.Setup; import org.openjdk.jmh.annotations.State; import org.openjdk.jmh.annotations.Warmup; import org.openjdk.jmh.infra.Blackhole; import java.util.Arrays; import java.util.Random; import java.util.concurrent.TimeUnit; import java.io.UnsupportedEncodingException; import java.lang.invoke.MethodHandle; import java.lang.invoke.MethodHandles; import java.lang.reflect.Method; /** * Performance test of Arrays.hashCode() methods */ @BenchmarkMode(Mode.AverageTime) @OutputTimeUnit(TimeUnit.NANOSECONDS) @State(Scope.Thread) @Warmup(iterations = 5, time = 1) @Measurement(iterations = 5, time = 1) @Fork(value = 3) public class ArraysHashCode { @Param({"1", "10", "100", "10000"}) private int size; private byte[] bytes; private char[] chars; private short[] shorts; private int[] ints; private byte[][] multibytes; private char[][] multichars; private short[][] multishorts; private int[][] multiints; @Setup public void setup() throws UnsupportedEncodingException, ClassNotFoundException, NoSuchMethodException, Throwable { Random rnd = new Random(42); bytes = new byte[size]; chars = new char[size]; shorts = new short[size]; ints = new int[size]; for (int i = 0; i < size; i++) { int next = rnd.nextInt(); bytes[i] = (byte)next; chars[i] = (char)next; shorts[i] = (short)next; ints[i] = next; } multibytes = new byte[100][]; multichars = new char[100][]; multishorts = new short[100][]; multiints = new int[100][]; for (int i = 0; i < 100; i++) { int next = rnd.nextInt(size + 1); multibytes[i] = new byte[next]; multichars[i] = new char[next]; multishorts[i] = new short[next]; multiints[i] = new int[next]; for (int j = 0; j < next; j++) { int nextj = rnd.nextInt(); multibytes[i][j] = (byte)nextj; multichars[i][j] = (char)nextj; multishorts[i][j] = (short)nextj; multiints[i][j] = nextj; } } } @Benchmark public int bytes() throws Throwable { return Arrays.hashCode(bytes); } @Benchmark public int chars() throws Throwable { return Arrays.hashCode(chars); } @Benchmark public int shorts() throws Throwable { return Arrays.hashCode(shorts); } @Benchmark public int ints() throws Throwable { return Arrays.hashCode(ints); } @Benchmark @OperationsPerInvocation(100) public void multibytes(Blackhole bh) throws Throwable { for (int i = 0; i < multibytes.length; i++) { bh.consume(Arrays.hashCode(multibytes[i])); } } @Benchmark @OperationsPerInvocation(100) public void multichars(Blackhole bh) throws Throwable { for (int i = 0; i < multichars.length; i++) { bh.consume(Arrays.hashCode(multichars[i])); } } @Benchmark @OperationsPerInvocation(100) public void multishorts(Blackhole bh) throws Throwable { for (int i = 0; i < multishorts.length; i++) { bh.consume(Arrays.hashCode(multishorts[i])); } } @Benchmark @OperationsPerInvocation(100) public void multiints(Blackhole bh) throws Throwable { for (int i = 0; i < multibytes.length; i++) { bh.consume(Arrays.hashCode(multiints[i])); } } }