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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.commons.lang3;
import java.text.NumberFormat;
import java.util.Calendar;
/**
* Tests the difference in performance between CharUtils and CharSet.
*
* Sample runs:
Now: Thu Mar 18 14:29:48 PST 2004
Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.3.1_10-b03
Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.3.1_10-b03
Windows XP 5.1 x86 pentium i486 i386
Do nothing: 0 milliseconds.
run_CharUtils_isAsciiNumeric: 4,545 milliseconds.
run_inlined_CharUtils_isAsciiNumeric: 3,417 milliseconds.
run_inlined_CharUtils_isAsciiNumeric: 85,679 milliseconds.
Now: Thu Mar 18 14:24:51 PST 2004
Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
Sun Microsystems Inc. Java HotSpot(TM) Client VM 1.4.2_04-b05
Windows XP 5.1 x86 pentium i486 i386
Do nothing: 0 milliseconds.
run_CharUtils_isAsciiNumeric: 2,578 milliseconds.
run_inlined_CharUtils_isAsciiNumeric: 2,477 milliseconds.
run_inlined_CharUtils_isAsciiNumeric: 114,429 milliseconds.
Now: Thu Mar 18 14:27:55 PST 2004
Sun Microsystems Inc. Java(TM) 2 Runtime Environment, Standard Edition 1.4.2_04-b05
Sun Microsystems Inc. Java HotSpot(TM) Server VM 1.4.2_04-b05
Windows XP 5.1 x86 pentium i486 i386
Do nothing: 0 milliseconds.
run_CharUtils_isAsciiNumeric: 630 milliseconds.
run_inlined_CharUtils_isAsciiNumeric: 709 milliseconds.
run_inlined_CharUtils_isAsciiNumeric: 84,420 milliseconds.
*/
public class CharUtilsPerfRun {
private static final String VERSION = "$Id$";
private static final int WARM_UP = 100;
private static final int COUNT = 5000;
private static final char[] CHAR_SAMPLES;
static {
CHAR_SAMPLES = new char[Character.MAX_VALUE];
for (char i = Character.MIN_VALUE; i < Character.MAX_VALUE; i++) {
CHAR_SAMPLES[i] = i;
}
}
public static void main(final String[] args) {
new CharUtilsPerfRun().run();
}
private void printSysInfo() {
System.out.println(VERSION);
System.out.println("Now: " + Calendar.getInstance().getTime());
System.out.println(System.getProperty("java.vendor")
+ " "
+ System.getProperty("java.runtime.name")
+ " "
+ System.getProperty("java.runtime.version"));
System.out.println(System.getProperty("java.vm.vendor")
+ " "
+ System.getProperty("java.vm.name")
+ " "
+ System.getProperty("java.vm.version"));
System.out.println(System.getProperty("os.name")
+ " "
+ System.getProperty("os.version")
+ " "
+ System.getProperty("os.arch")
+ " "
+ System.getProperty("sun.cpu.isalist"));
}
private void run() {
this.printSysInfo();
long startMillis;
startMillis = System.currentTimeMillis();
this.printlnTotal("Do nothing", startMillis);
run_CharUtils_isAsciiNumeric(WARM_UP);
startMillis = System.currentTimeMillis();
run_CharUtils_isAsciiNumeric(COUNT);
this.printlnTotal("run_CharUtils_isAsciiNumeric", startMillis);
run_inlined_CharUtils_isAsciiNumeric(WARM_UP);
startMillis = System.currentTimeMillis();
run_inlined_CharUtils_isAsciiNumeric(COUNT);
this.printlnTotal("run_inlined_CharUtils_isAsciiNumeric", startMillis);
run_CharSet(WARM_UP);
startMillis = System.currentTimeMillis();
run_CharSet(COUNT);
this.printlnTotal("run_CharSet", startMillis);
}
private int run_CharSet(final int loopCount) {
int t = 0;
for (int i = 0; i < loopCount; i++) {
for (final char ch : CHAR_SAMPLES) {
final boolean b = CharSet.ASCII_NUMERIC.contains(ch);
t += b ? 1 : 0;
}
}
return t;
}
private int run_CharUtils_isAsciiNumeric(final int loopCount) {
int t = 0;
for (int i = 0; i < loopCount; i++) {
for (final char ch : CHAR_SAMPLES) {
final boolean b = CharUtils.isAsciiNumeric(ch);
t += b ? 1 : 0;
}
}
return t;
}
private int run_inlined_CharUtils_isAsciiNumeric(final int loopCount) {
int t = 0;
for (int i = 0; i < loopCount; i++) {
for (final char ch : CHAR_SAMPLES) {
final boolean b = ch >= '0' && ch <= '9';
t += b ? 1 : 0;
}
}
return t;
}
private void printlnTotal(final String prefix, final long startMillis) {
final long totalMillis = System.currentTimeMillis() - startMillis;
System.out.println(prefix + ": " + NumberFormat.getInstance().format(totalMillis) + " milliseconds.");
}
}
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