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; 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 import org.openjdk.jmh.annotations.Threads; 34 import org.openjdk.jmh.infra.Blackhole; 35 36 import java.util.concurrent.TimeUnit; 37 38 @BenchmarkMode(Mode.AverageTime) 39 @OutputTimeUnit(TimeUnit.MICROSECONDS) 40 @State(Scope.Thread) 41 public class Longs { 42 43 @Param("500") 44 private int size; 45 46 private long[] longArraySmall; 47 private long[] longArrayBig; 48 49 @Setup 50 public void setup() { 51 longArraySmall = new long[size]; 52 longArrayBig = new long[size]; 53 for (int i = 0; i < size; i++) { 54 longArraySmall[i] = 100L * i + i + 103L; 55 longArrayBig[i] = ((100L * i + i) << 32) + 4543 + i * 4; 56 } 57 } 58 59 /** Performs toString on a bunch of java.lang.Long:s, all with small values, just a couple of digits. */ 60 @Benchmark 61 @Threads(Threads.MAX) 62 public void toStringSmall(Blackhole bh) { 63 for (long value : longArraySmall) { 64 bh.consume(Long.toString(value)); 65 } 66 } 67 68 /** Performs toString on a bunch of java.lang.Long:s, all with large values, around 10 digits. */ 69 @Benchmark 70 @Threads(Threads.MAX) 71 public void toStringBig(Blackhole bh) { 72 for (long value : longArrayBig) { 73 bh.consume(Long.toString(value)); 74 } 75 } 76 77 /* 78 * Have them public to avoid total unrolling 79 */ 80 public int innerLoops = 1500; 81 82 @Benchmark 83 @Threads(Threads.MAX) 84 public long repetitiveSubtraction() { 85 long x = 127, dx = 0; 86 87 for (int i = 0; i < innerLoops; i++) { 88 x -= dx; 89 dx = (dx - x); 90 } 91 return x; 92 } 93 }