1 /*
2 * Copyright (c) 2014, 2019, 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.Scope;
30 import org.openjdk.jmh.annotations.Setup;
31 import org.openjdk.jmh.annotations.State;
32
33 import java.util.concurrent.TimeUnit;
34
35 @BenchmarkMode(Mode.AverageTime)
36 @OutputTimeUnit(TimeUnit.NANOSECONDS)
37 @State(Scope.Thread)
38 public class StringBuilders {
39
40 private String[] strings;
41 private String[] str3p4p2;
42 private String[] str16p8p7;
43 private String[] str3p9p8;
44 private String[] str22p40p31;
45 private String[] str22p40p31;
46 private StringBuilder sbLatin1;
47 private StringBuilder sbUtf8;
48
49 return new StringBuilder("Latin1 string");
50 }
51
52 @Setup
53 public void setup() {
54 strings = new String[]{"As", "your", "attorney,", "I",
55 "advise", "you", "to", "drive", "at", "top", "speed", "it'll",
56 "be", "a", "god", "damn", "miracle", "if", "we", "can", "get",
57 "there", "before", "you", "turn", "into", "a", "wild", "animal."};
58 str3p4p2 = new String[]{"123", "1234", "12"};
59 str16p8p7 = new String[]{"1234567890123456", "12345678", "1234567"};
60 str3p9p8 = new String[]{"123", "123456789", "12345678"};
61 str22p40p31 = new String[]{"1234567890123456789012", "1234567890123456789012345678901234567890", "1234567890123456789012345678901"};
62 sbLatin1 = new StringBuilder("Latin1 string");
63 sbUtf8 = new StringBuilder("UTF-\uFF18 string");
64 }
65
66 /** StringBuilder wins over StringMaker. */
67 @Benchmark
68 public String concat3p4p2() throws Exception {
69 return new StringBuilder(String.valueOf(str3p4p2[0])).append(str3p4p2[1]).append(str3p4p2[2]).toString();
70 }
71
72 /** StringBuilder wins over StringMaker. */
73 @Benchmark
74 public String concat16p8p7() throws Exception {
75 return new StringBuilder(String.valueOf(str16p8p7[0])).append(str16p8p7[1]).append(str16p8p7[2]).toString();
76 }
77
78 /** StringMaker wins over StringBuilder since the two last strings causes StringBuilder to do expand. */
79 @Benchmark
80 public String concat3p9p8() throws Exception {
81 return new StringBuilder(String.valueOf(str3p9p8[0])).append(str3p9p8[1]).append(str3p9p8[2]).toString();
82 }
83
84 /** StringMaker wins over StringBuilder. */
85 @Benchmark
86 public String concat22p40p31() throws Exception {
87 return new StringBuilder(String.valueOf(str22p40p31[0])).append(str22p40p31[1]).append(str22p40p31[2]).toString();
88 }
89
90 @Benchmark
91 public StringBuilder appendLoop8() {
92 StringBuilder sb = new StringBuilder();
93 for (int i = 0; i < 8; i++) {
94 sb.append(strings[i]);
95 }
96 return sb;
97 }
98
99 @Benchmark
100 public StringBuilder appendLoop16() {
101 StringBuilder sb = new StringBuilder();
102 for (int i = 0; i < 16; i++) {
103 sb.append(strings[i]);
104 }
105 return sb;
106 }
107
108 @Benchmark
109 public String toStringCharWithChar1() {
110 StringBuilder result = new StringBuilder();
111 result.append('a');
112 return result.toString();
113 }
114
115 @Benchmark
116 public String toStringCharWithChar2() {
117 StringBuilder result = new StringBuilder();
118 result.append('a');
119 result.append('p');
120 return result.toString();
121 }
122
123
124 @Benchmark
125 public String toStringCharWithChar4() {
126 StringBuilder result = new StringBuilder();
127 result.append('a');
128 result.append('p');
129 result.append('a');
130 result.append(' ');
131 return result.toString();
132 }
133
134 @Benchmark
135 public String toStringCharWithChar8() {
136 StringBuilder result = new StringBuilder();
137 result.append('a');
138 result.append('p');
139 result.append('a');
140 result.append(' ');
141 result.append('a');
142 result.append('p');
143 result.append('a');
144 result.append(' ');
145 return result.toString();
146 }
147
148 @Benchmark
149 public String toStringCharWithChar16() {
150 StringBuilder result = new StringBuilder();
151 result.append('a');
152 result.append('b');
153 result.append('c');
154 result.append('d');
155 result.append('e');
156 result.append('f');
157 result.append('g');
158 result.append('h');
159 result.append('i');
160 result.append('j');
161 result.append('k');
162 result.append('l');
163 result.append('m');
164 result.append('n');
165 result.append('o');
166 result.append('p');
167 return result.toString();
168 }
169
170
171 @Benchmark
172 public String toStringCharWithString8() {
173 StringBuilder result = new StringBuilder();
174 result.append("a");
175 result.append("b");
176 result.append("c");
177 result.append("d");
178 result.append("e");
179 result.append("f");
180 result.append("g");
181 result.append("h");
182 return result.toString();
183 }
184
185
186 @Benchmark
187 public String toStringCharWithString16() {
188 StringBuilder result = new StringBuilder();
189 result.append("a");
190 result.append("b");
191 result.append("c");
192 result.append("d");
193 result.append("e");
194 result.append("f");
195 result.append("g");
196 result.append("h");
197 result.append("i");
198 result.append("j");
199 result.append("k");
200 result.append("l");
201 result.append("m");
202 result.append("n");
203 result.append("o");
204 result.append("p");
205 return result.toString();
206 }
207
208
209 @Benchmark
210 public String toStringCharWithInt8() {
211 StringBuilder result = new StringBuilder();
212 result.append(2048);
213 result.append(31337);
214 result.append(0xbeefcace);
215 result.append(9000);
216 result.append(4711);
217 result.append(1337);
218 result.append(2100);
219 result.append(2600);
220 return result.toString();
221 }
222
223
224 @Benchmark
225 public String toStringCharWithBool8() {
226 StringBuilder result = new StringBuilder();
227 result.append(true);
228 result.append(false);
229 result.append(true);
230 result.append(true);
231 result.append(false);
232 result.append(true);
233 result.append(false);
234 result.append(false);
235 return result.toString();
236 }
237
238
239 @Benchmark
240 public String toStringCharWithFloat8() {
241 StringBuilder result = new StringBuilder();
242 result.append(113.110F);
243 result.append(156456.36435637F);
244 result.append(65436434.64632F);
245 result.append(42654634.64540F);
246 result.append(63464351.64537F);
247 result.append(634564.645711F);
248 result.append(64547.64311F);
249 result.append(4763456341.64531F);
250 return result.toString();
251 }
252
253
254 @Benchmark
255 public String toStringCharWithMixed8() {
256 StringBuilder result = new StringBuilder();
257 result.append('a');
258 result.append("stringelinglinglinglong");
259 result.append('a');
260 result.append("stringelinglinglinglong");
261 result.append('a');
262 result.append("stringelinglinglinglong");
263 result.append('p');
264 result.append("stringelinglinglinglong");
265 return result.toString();
266 }
267
268 @Benchmark
269 public StringBuilder fromLatin1String() {
270 return new StringBuilder("Latin1 string");
271 }
272
273 @Benchmark
274 public StringBuilder fromUtf8String() {
275 return new StringBuilder("UTF-\uFF18 string");
276 }
277
278 @Benchmark
279 public StringBuilder fromLatin1StringBuilder() {
280 return new StringBuilder(sbLatin1);
281 }
282
283 @Benchmark
284 public StringBuilder fromUtf8StringBuilder() {
285 return new StringBuilder(sbUtf8);
286 }
287 }