1 /*
2 * Copyright (c) 2020, 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;
24
25 import org.openjdk.jmh.annotations.Benchmark;
26 import org.openjdk.jmh.annotations.BenchmarkMode;
27 import org.openjdk.jmh.annotations.Fork;
28 import org.openjdk.jmh.annotations.Measurement;
29 import org.openjdk.jmh.annotations.Mode;
30 import org.openjdk.jmh.annotations.OutputTimeUnit;
31 import org.openjdk.jmh.annotations.Param;
32 import org.openjdk.jmh.annotations.Scope;
33 import org.openjdk.jmh.annotations.Setup;
34 import org.openjdk.jmh.annotations.State;
35 import org.openjdk.jmh.annotations.Warmup;
36 import org.openjdk.jmh.infra.Blackhole;
37
38 import java.util.Arrays;
39 import java.util.Collections;
40 import java.util.Comparator;
41 import java.util.Map;
42 import java.util.Random;
43 import java.util.TreeMap;
44 import java.util.concurrent.TimeUnit;
45 import java.util.function.Function;
46 import java.util.function.Supplier;
47 import java.util.stream.Collectors;
48 import java.util.stream.IntStream;
49
50 @BenchmarkMode(Mode.AverageTime)
51 @OutputTimeUnit(TimeUnit.NANOSECONDS)
52 @Warmup(iterations = 5, time = 500, timeUnit = TimeUnit.MILLISECONDS)
53 @Measurement(iterations = 10, time = 500, timeUnit = TimeUnit.MILLISECONDS)
54 @Fork(3)
55 @State(Scope.Thread)
56 public class TreeMapUpdate {
57 @Param({"10", "1000", "100000"})
58 public int size;
59
60 @Param({"true", "false"})
61 public boolean comparator;
62
63 @Param({"true", "false"})
64 public boolean preFill;
65
66 @Param({"0"})
67 public long seed;
68
69 private Supplier<TreeMap<Integer, Integer>> supplier;
70
71 private Integer[] keys;
72
73 @Setup
74 public void setUp() {
75 supplier = comparator ? () -> new TreeMap<>(Comparator.reverseOrder()) : TreeMap::new;
76 keys = IntStream.range(0, size).boxed().toArray(Integer[]::new);
77 Random rnd = seed == 0 ? new Random() : new Random(seed);
78 Collections.shuffle(Arrays.asList(keys, rnd));
79 if (preFill) {
80 TreeMap<Integer, Integer> template = Arrays.stream(keys)
81 .collect(Collectors.toMap(Function.identity(), Function.identity(), (a, b) -> a, supplier));
82 supplier = () -> new TreeMap<>(template);
83 }
84 }
85
86 @Benchmark
87 public Map<Integer, Integer> baseline() {
88 // Just create map (empty or pre-filled)
89 return supplier.get();
90 }
91
92 @Benchmark
93 public Map<Integer, Integer> put(Blackhole bh) {
94 Map<Integer, Integer> map = supplier.get();
95 Integer[] keys = this.keys;
96 for (Integer key : keys) {
97 bh.consume(map.put(key, key));
98 }
99 return map;
100 }
101
102 @Benchmark
103 public Map<Integer, Integer> putIfAbsent(Blackhole bh) {
104 Map<Integer, Integer> map = supplier.get();
105 Integer[] keys = this.keys;
106 for (Integer key : keys) {
107 bh.consume(map.putIfAbsent(key, key));
108 }
109 return map;
110 }
111
112 @Benchmark
113 public Map<Integer, Integer> computeIfAbsent(Blackhole bh) {
114 Map<Integer, Integer> map = supplier.get();
115 Integer[] keys = this.keys;
116 for (Integer key : keys) {
117 bh.consume(map.computeIfAbsent(key, k -> k));
118 }
119 return map;
120 }
121
122 @Benchmark
123 public Map<Integer, Integer> compute(Blackhole bh) {
124 Map<Integer, Integer> map = supplier.get();
125 Integer[] keys = this.keys;
126 for (Integer key : keys) {
127 bh.consume(map.compute(key, (k, old) -> k));
128 }
129 return map;
130 }
131
132 @Benchmark
133 public Map<Integer, Integer> computeIfPresent(Blackhole bh) {
134 Map<Integer, Integer> map = supplier.get();
135 Integer[] keys = this.keys;
136 for (Integer key : keys) {
137 bh.consume(map.computeIfPresent(key, (k, old) -> k));
138 }
139 return map;
140 }
141
142 @Benchmark
143 public Map<Integer, Integer> merge(Blackhole bh) {
144 Map<Integer, Integer> map = supplier.get();
145 Integer[] keys = this.keys;
146 for (Integer key : keys) {
147 bh.consume(map.merge(key, key, (k1, k2) -> k1));
148 }
149 return map;
150 }
151 }