1 /*
2 * Licensed to the Apache Software Foundation (ASF) under one or more
3 * contributor license agreements. See the NOTICE file distributed with
4 * this work for additional information regarding copyright ownership.
5 * The ASF licenses this file to You under the Apache License, Version 2.0
6 * (the "License"); you may not use this file except in compliance with
7 * the License. You may obtain a copy of the License at
8 *
9 * http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18 package org.apache.commons.lang;
19
20 import java.text.NumberFormat;
21 import java.util.Calendar;
22
23 /**
24 * Tests the difference in performance between CharUtils and CharSet.
25 *
26 * Sample runs:
27
28 Now: Thu Mar 18 14:29:48 PST 2004
29 Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.3.1_10-b03
30 Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.3.1_10-b03
31 Windows XP 5.1 x86 pentium i486 i386
32 Do nohting: 0 milliseconds.
33 run_CharUtils_isAsciiNumeric: 4,545 milliseconds.
34 run_inlined_CharUtils_isAsciiNumeric: 3,417 milliseconds.
35 run_inlined_CharUtils_isAsciiNumeric: 85,679 milliseconds.
36
37
38 Now: Thu Mar 18 14:24:51 PST 2004
39 Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
40 Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.4.2_04-b05
41 Windows XP 5.1 x86 pentium i486 i386
42 Do nohting: 0 milliseconds.
43 run_CharUtils_isAsciiNumeric: 2,578 milliseconds.
44 run_inlined_CharUtils_isAsciiNumeric: 2,477 milliseconds.
45 run_inlined_CharUtils_isAsciiNumeric: 114,429 milliseconds.
46
47 Now: Thu Mar 18 14:27:55 PST 2004
48 Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
49 Sun Microsystems Inc. Java HotSpot(TM) Server VM 1.4.2_04-b05
50 Windows XP 5.1 x86 pentium i486 i386
51 Do nohting: 0 milliseconds.
52 run_CharUtils_isAsciiNumeric: 630 milliseconds.
53 run_inlined_CharUtils_isAsciiNumeric: 709 milliseconds.
54 run_inlined_CharUtils_isAsciiNumeric: 84,420 milliseconds.
55
56
57 * @version $Id: CharUtilsPerfTest.java 437554 2006-08-28 06:21:41Z bayard $
58 */
59 public class CharUtilsPerfTest {
60 final static String VERSION = "$Id: CharUtilsPerfTest.java 437554 2006-08-28 06:21:41Z bayard $";
61
62 final static int WARM_UP = 100;
63
64 final static int COUNT = 5000;
65
66 final static char[] CHAR_SAMPLES;
67 static {
68 CHAR_SAMPLES = new char[Character.MAX_VALUE];
69 for (char i = Character.MIN_VALUE; i < Character.MAX_VALUE; i++) {
70 CHAR_SAMPLES[i] = i;
71 }
72 }
73
74 public static void main(String[] args) {
75 new CharUtilsPerfTest().run();
76 }
77
78 private void printSysInfo() {
79 System.out.println(VERSION);
80 System.out.println("Now: " + Calendar.getInstance().getTime());
81 System.out.println(System.getProperty("java.vendor")
82 + " "
83 + System.getProperty("java.runtime.name")
84 + " "
85 + System.getProperty("java.runtime.version"));
86 System.out.println(System.getProperty("java.vm.vendor")
87 + " "
88 + System.getProperty("java.vm.name")
89 + " "
90 + System.getProperty("java.vm.version"));
91 System.out.println(System.getProperty("os.name")
92 + " "
93 + System.getProperty("os.version")
94 + " "
95 + System.getProperty("os.arch")
96 + " "
97 + System.getProperty("sun.cpu.isalist"));
98 }
99
100 private void run() {
101 this.printSysInfo();
102 long start;
103 start = System.currentTimeMillis();
104 this.printlnTotal("Do nohting", start);
105 //System.out.println("Warming up...");
106 run_CharUtils_isAsciiNumeric(WARM_UP);
107 //System.out.println("Measuring...");
108 start = System.currentTimeMillis();
109 run_CharUtils_isAsciiNumeric(COUNT);
110 this.printlnTotal("run_CharUtils_isAsciiNumeric", start);
111 //System.out.println("Warming up...");
112 run_inlined_CharUtils_isAsciiNumeric(WARM_UP);
113 //System.out.println("Measuring...");
114 start = System.currentTimeMillis();
115 run_inlined_CharUtils_isAsciiNumeric(COUNT);
116 this.printlnTotal("run_inlined_CharUtils_isAsciiNumeric", start);
117 //System.out.println("Warming up...");
118 run_CharSet(WARM_UP);
119 //System.out.println("Measuring...");
120 start = System.currentTimeMillis();
121 run_CharSet(COUNT);
122 this.printlnTotal("run_CharSet", start);
123 }
124
125 private int run_CharSet(int loopCount) {
126 int t = 0;
127 for (int i = 0; i < loopCount; i++) {
128 for (int j = 0; j < CHAR_SAMPLES.length; j++) {
129 char ch = CHAR_SAMPLES[j];
130 boolean b = CharSet.ASCII_NUMERIC.contains(ch);
131 t += b ? 1 : 0;
132 }
133 }
134 return t;
135 }
136
137 private int run_CharUtils_isAsciiNumeric(int loopCount) {
138 int t = 0;
139 for (int i = 0; i < loopCount; i++) {
140 for (int j = 0; j < CHAR_SAMPLES.length; j++) {
141 char ch = CHAR_SAMPLES[j];
142 boolean b = CharUtils.isAsciiNumeric(ch);
143 t += b ? 1 : 0;
144 }
145 }
146 return t;
147 }
148
149 private int run_inlined_CharUtils_isAsciiNumeric(int loopCount) {
150 int t = 0;
151 for (int i = 0; i < loopCount; i++) {
152 for (int j = 0; j < CHAR_SAMPLES.length; j++) {
153 char ch = CHAR_SAMPLES[j];
154 boolean b = (ch >= '0' && ch <= '9');
155 t += b ? 1 : 0;
156 }
157 }
158 return t;
159 }
160
161 private void printlnTotal(String prefix, long start) {
162 long total = System.currentTimeMillis() - start;
163 System.out.println(prefix + ": " + NumberFormat.getInstance().format(total) + " milliseconds.");
164 }
165 }