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.util.concurrent;
  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.util.concurrent.TimeUnit;
  34 import java.util.concurrent.atomic.AtomicInteger;
  35 import java.util.function.IntUnaryOperator;
  36 
  37 /**
  38  * Benchmarks assesses the performance of new Atomic* API.
  39  *
  40  * Implementation notes:
  41  *   - atomic instances are padded to eliminate false sharing
  42  */
  43 @BenchmarkMode(Mode.AverageTime)
  44 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  45 @State(Scope.Thread)
  46 public class AtomicIntegerUpdateAndGet {
  47 
  48     private PaddedAtomicInteger count;
  49     private int value = 42;
  50     private IntUnaryOperator captureOp;
  51     private IntUnaryOperator noCaptureOp;
  52 
  53     @Setup
  54     public void setup() {
  55         count = new PaddedAtomicInteger();
  56         noCaptureOp = new IntUnaryOperator() {
  57             public int applyAsInt(int v) {
  58                 return v + 42;
  59             }
  60         };
  61         captureOp = new IntUnaryOperator() {
  62             public int applyAsInt(int v) {
  63                 return v + value;
  64             }
  65         };
  66     }
  67 
  68     @Benchmark
  69     public int testAddAndGet() {
  70         return count.addAndGet(42);
  71     }
  72 
  73     @Benchmark
  74     public int testInnerNoCapture() {
  75         return count.updateAndGet(new IntUnaryOperator() {
  76             public int applyAsInt(int v) {
  77                 return v + 42;
  78             }
  79         });
  80     }
  81 
  82     @Benchmark
  83     public int testInnerCapture() {
  84         return count.updateAndGet(new IntUnaryOperator() {
  85             public int applyAsInt(int v) {
  86                 return v + value;
  87             }
  88         });
  89     }
  90 
  91     @Benchmark
  92     public int testInnerCaptureCached() {
  93         return count.updateAndGet(captureOp);
  94     }
  95 
  96     @Benchmark
  97     public int testInnerNoCaptureCached() {
  98         return count.updateAndGet(noCaptureOp);
  99     }
 100 
 101     @Benchmark
 102     public int testLambdaNoCapture() {
 103         return count.updateAndGet(x -> x + 42);
 104     }
 105 
 106     @Benchmark
 107     public int testLambdaCapture() {
 108         return count.updateAndGet(x -> x + value);
 109     }
 110 
 111     private static class PaddedAtomicInteger extends AtomicInteger {
 112         private volatile long pad00, pad01, pad02, pad03, pad04, pad05, pad06, pad07;
 113         private volatile long pad10, pad11, pad12, pad13, pad14, pad15, pad16, pad17;
 114     }
 115 
 116 }