1 /*
2 * Copyright (c) 2009, 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 import java.util.*;
25 import java.nio.*;
26 import java.nio.charset.*;
27 import java.util.concurrent.*;
28 import java.util.regex.Pattern;
29
30 /**
31 * Usage: java StringCodingBenchmark
32 * [-Diterations=N] [-Dsize=N] [-Dsubsize=N] [-Dmaxchar=N]
33 * [-Dfilter=REGEXP] [-DSecurityManager=true]
34 */
35 public class StrCodingBenchmark {
36 abstract static class Job {
37 private final String name;
38 public Job(String name) { this.name = name; }
39 public String name() { return name; }
40 public abstract void work() throws Throwable;
41 }
42
43 private static void collectAllGarbage() {
44 final java.util.concurrent.CountDownLatch drained
45 = new java.util.concurrent.CountDownLatch(1);
46 try {
47 System.gc(); // enqueue finalizable objects
48 new Object() { protected void finalize() {
49 drained.countDown(); }};
50 System.gc(); // enqueue detector
51 drained.await(); // wait for finalizer queue to drain
52 System.gc(); // cleanup finalized objects
53 } catch (InterruptedException e) { throw new Error(e); }
54 }
55
56 /**
57 * Runs each job for long enough that all the runtime compilers
58 * have had plenty of time to warm up, i.e. get around to
59 * compiling everything worth compiling.
60 * Returns array of average times per job per run.
61 */
62 public static long[] time0(Job ... jobs) throws Throwable {
63 //final long warmupNanos = 10L * 1000L * 1000L * 1000L;
64 final long warmupNanos = 100L * 100L;
65 long[] nanoss = new long[jobs.length];
66 for (int i = 0; i < jobs.length; i++) {
67 collectAllGarbage();
68 long t0 = System.nanoTime();
69 long t;
70 int j = 0;
71 do { jobs[i].work(); j++; }
72 while ((t = System.nanoTime() - t0) < warmupNanos);
73 nanoss[i] = t/j;
74 }
75 return nanoss;
76 }
77
78 public static void time(Job ... jobs) throws Throwable {
79
80 long[] warmup = time0(jobs); // Warm up run
81 long[] nanoss = time0(jobs); // Real timing run
82 long[] milliss = new long[jobs.length];
83 double[] ratios = new double[jobs.length];
84
85 final String nameHeader = "Method";
86 final String millisHeader = "Millis";
87 final String ratioHeader = "Ratio";
88
89 int nameWidth = nameHeader.length();
90 int millisWidth = millisHeader.length();
91 int ratioWidth = ratioHeader.length();
92
93 for (int i = 0; i < jobs.length; i++) {
94 nameWidth = Math.max(nameWidth, jobs[i].name().length());
95
96 milliss[i] = nanoss[i]/(1000L * 1000L);
97 millisWidth = Math.max(millisWidth,
98 String.format("%d", milliss[i]).length());
99
100 ratios[i] = (double) nanoss[i] / (double) nanoss[0];
101 ratioWidth = Math.max(ratioWidth,
102 String.format("%.3f", ratios[i]).length());
103 }
104 String format = String.format("%%-%ds %%%dd %n",
105 nameWidth, millisWidth);
106 String headerFormat = String.format("%%-%ds %%%ds%n",
107 nameWidth, millisWidth);
108 System.out.printf(headerFormat, "Method", "Millis");
109
110 // Print out absolute and relative times, calibrated against first job
111 for (int i = 0; i < jobs.length; i++)
112 System.out.printf(format, jobs[i].name(), milliss[i], ratios[i]);
113 }
114
115 public static Job[] filter(Pattern filter, Job[] jobs) {
116 if (filter == null) return jobs;
117 Job[] newJobs = new Job[jobs.length];
118 int n = 0;
119 for (Job job : jobs)
120 if (filter.matcher(job.name()).find())
121 newJobs[n++] = job;
122 // Arrays.copyOf not available in JDK 5
123 Job[] ret = new Job[n];
124 System.arraycopy(newJobs, 0, ret, 0, n);
125 return ret;
126 }
127
128 static class PermissiveSecurityManger extends SecurityManager {
129 @Override public void checkPermission(java.security.Permission p) {
130 }
131 }
132
133 public static void main(String[] args) throws Throwable {
134 final int itrs = Integer.getInteger("iterations", 100000);
135 final int size = Integer.getInteger("size", 2048);
136 final int subsize = Integer.getInteger("subsize", 128);
137 final int maxchar = Integer.getInteger("maxchar", 128);
138 final String regex = System.getProperty("filter");
139 final Pattern filter = (regex == null) ? null : Pattern.compile(regex);
140 final boolean useSecurityManager = Boolean.getBoolean("SecurityManager");
141 if (useSecurityManager)
142 System.setSecurityManager(new PermissiveSecurityManger());
143 final Random rnd = new Random();
144
145 for (Charset charset: Charset.availableCharsets().values()) {
146 if (!("ISO-8859-1".equals(charset.name()) ||
147 "US-ASCII".equals(charset.name()) ||
148 charset.newDecoder() instanceof sun.nio.cs.SingleByte.Decoder))
149 continue;
150 final String csn = charset.name();
151 final Charset cs = charset;
152 final StringBuilder sb = new StringBuilder();
153 {
154 final CharsetEncoder enc = cs.newEncoder();
155 for (int i = 0; i < size; ) {
156 char c = (char) rnd.nextInt(maxchar);
157 if (enc.canEncode(c)) {
158 sb.append(c);
159 i++;
160 }
161 }
162 }
163 final String string = sb.toString();
164 final byte[] bytes = string.getBytes(cs);
165
166 System.out.printf("%n--------%s---------%n", csn);
167 for (int sz = 4; sz <= 2048; sz *= 2) {
168 System.out.printf(" [len=%d]%n", sz);
169 final byte[] bs = Arrays.copyOf(bytes, sz);
170 final String str = new String(bs, csn);
171 Job[] jobs = {
172 new Job("String decode: csn") {
173 public void work() throws Throwable {
174 for (int i = 0; i < itrs; i++)
175 new String(bs, csn);
176 }},
177
178 new Job("String decode: cs") {
179 public void work() throws Throwable {
180 for (int i = 0; i < itrs; i++)
181 new String(bs, cs);
182 }},
183
184 new Job("String encode: csn") {
185 public void work() throws Throwable {
186 for (int i = 0; i < itrs; i++)
187 str.getBytes(csn);
188 }},
189
190 new Job("String encode: cs") {
191 public void work() throws Throwable {
192 for (int i = 0; i < itrs; i++)
193 str.getBytes(cs);
194 }},
195 };
196 time(filter(filter, jobs));
197 }
198 }
199 }
200 }