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.vm.compiler; 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.Param; 30 import org.openjdk.jmh.annotations.Scope; 31 import org.openjdk.jmh.annotations.Setup; 32 import org.openjdk.jmh.annotations.State; 33 34 import java.util.concurrent.TimeUnit; 35 36 @BenchmarkMode(Mode.AverageTime) 37 @OutputTimeUnit(TimeUnit.NANOSECONDS) 38 @State(Scope.Thread) 39 public class ArrayClear { 40 41 @Param("100000") 42 private int arraySize; 43 44 private int[] sourceIntArray; 45 46 @Setup 47 public void setupSubclass() { 48 sourceIntArray = new int[arraySize]; 49 for (int i = 0; i < arraySize; i += 1) { 50 sourceIntArray[i] = i; 51 } 52 } 53 54 @Benchmark 55 public int[] testArrayClear() throws Exception { 56 int[] intArray = new int[arraySize]; 57 System.arraycopy(sourceIntArray, 0, intArray, 0, arraySize); 58 return intArray; 59 } 60 }