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 /*
  24  * To change this template, choose Tools | Templates
  25  * and open the template in the editor.
  26  */
  27 package org.openjdk.bench.java.math;
  28 
  29 import org.openjdk.jmh.annotations.Benchmark;
  30 import org.openjdk.jmh.annotations.BenchmarkMode;
  31 import org.openjdk.jmh.annotations.Mode;
  32 import org.openjdk.jmh.annotations.OperationsPerInvocation;
  33 import org.openjdk.jmh.annotations.OutputTimeUnit;
  34 import org.openjdk.jmh.annotations.Scope;
  35 import org.openjdk.jmh.annotations.Setup;
  36 import org.openjdk.jmh.annotations.State;
  37 import org.openjdk.jmh.infra.Blackhole;
  38 
  39 import java.math.BigInteger;
  40 import java.util.Random;
  41 import java.util.concurrent.TimeUnit;
  42 
  43 @BenchmarkMode(Mode.AverageTime)
  44 @OutputTimeUnit(TimeUnit.NANOSECONDS)
  45 @State(Scope.Thread)
  46 public class BigIntegers {
  47 
  48     private BigInteger[] hugeArray, largeArray, smallArray;
  49     public String[] dummyStringArray;
  50     public Object[] dummyArr;
  51     private static final int TESTSIZE = 1000;
  52 
  53     @Setup
  54     public void setup() {
  55         Random r = new Random(1123);
  56 
  57         hugeArray = new BigInteger[TESTSIZE]; /*
  58          * Huge numbers larger than
  59          * MAX_LONG
  60          */
  61         largeArray = new BigInteger[TESTSIZE]; /*
  62          * Large numbers less than
  63          * MAX_LONG but larger than
  64          * MAX_INT
  65          */
  66         smallArray = new BigInteger[TESTSIZE]; /*
  67          * Small number less than
  68          * MAX_INT
  69          */
  70 
  71         dummyStringArray = new String[TESTSIZE];
  72         dummyArr = new Object[TESTSIZE];
  73 
  74         for (int i = 0; i < TESTSIZE; i++) {
  75             int value = Math.abs(r.nextInt());
  76 
  77             hugeArray[i] = new BigInteger("" + ((long) value + (long) Integer.MAX_VALUE)
  78                     + ((long) value + (long) Integer.MAX_VALUE));
  79             largeArray[i] = new BigInteger("" + ((long) value + (long) Integer.MAX_VALUE));
  80             smallArray[i] = new BigInteger("" + ((long) value / 1000));
  81         }
  82     }
  83 
  84     /** Test BigInteger.toString() with huge numbers larger than MAX_LONG */
  85     @Benchmark
  86     @OperationsPerInvocation(TESTSIZE)
  87     public void testHugeToString(Blackhole bh) {
  88         for (BigInteger s : hugeArray) {
  89             bh.consume(s.toString());
  90         }
  91     }
  92 
  93     /** Test BigInteger.toString() with large numbers less than MAX_LONG but larger than MAX_INT */
  94     @Benchmark
  95     @OperationsPerInvocation(TESTSIZE)
  96     public void testLargeToString(Blackhole bh) {
  97         for (BigInteger s : largeArray) {
  98             bh.consume(s.toString());
  99         }
 100     }
 101 
 102     /** Test BigInteger.toString() with small numbers less than MAX_INT */
 103     @Benchmark
 104     @OperationsPerInvocation(TESTSIZE)
 105     public void testSmallToString(Blackhole bh) {
 106         for (BigInteger s : smallArray) {
 107             bh.consume(s.toString());
 108         }
 109     }
 110 
 111     /** Invokes the multiply method of BigInteger with various different values. */
 112     @Benchmark
 113     @OperationsPerInvocation(TESTSIZE)
 114     public void testMultiply(Blackhole bh) {
 115         BigInteger tmp = null;
 116         for (BigInteger s : hugeArray) {
 117             if (tmp == null) {
 118                 tmp = s;
 119                 continue;
 120             }
 121             tmp = tmp.multiply(s);
 122         }
 123         bh.consume(tmp);
 124     }
 125 
 126     /** Invokes the multiply method of BigInteger with various different values. */
 127     @Benchmark
 128     @OperationsPerInvocation(TESTSIZE)
 129     public void testAdd(Blackhole bh) {
 130         BigInteger tmp = null;
 131         for (BigInteger s : hugeArray) {
 132             if (tmp == null) {
 133                 tmp = s;
 134                 continue;
 135             }
 136             tmp = tmp.add(s);
 137         }
 138         bh.consume(tmp);
 139     }
 140 
 141     /** Invokes the shiftLeft method of BigInteger with different values. */
 142     @Benchmark
 143     @OperationsPerInvocation(TESTSIZE)
 144     public void testLeftShift(Blackhole bh) {
 145         Random rand = new Random();
 146         int shift = rand.nextInt(30) + 1;
 147         BigInteger tmp = null;
 148         for (BigInteger s : hugeArray) {
 149             if (tmp == null) {
 150                 tmp = s;
 151                 continue;
 152             }
 153             tmp = tmp.shiftLeft(shift);
 154         }
 155         bh.consume(tmp);
 156     }
 157 
 158     /** Invokes the shiftRight method of BigInteger with different values. */
 159     @Benchmark
 160     @OperationsPerInvocation(TESTSIZE)
 161     public void testRightShift(Blackhole bh) {
 162         Random rand = new Random();
 163         int shift = rand.nextInt(30) + 1;
 164         BigInteger tmp = null;
 165         for (BigInteger s : hugeArray) {
 166             if (tmp == null) {
 167                 tmp = s;
 168                 continue;
 169             }
 170             tmp = tmp.shiftRight(shift);
 171         }
 172         bh.consume(tmp);
 173     }
 174 }
--- EOF ---