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 }