The version of Apache log4j used by SoundHelix.
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LoggingLoop.java
/*
* Copyright 1999,2004 The Apache Software Foundation.
*
* Licensed 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.log4j.performance;
import org.apache.log4j.Appender;
import org.apache.log4j.Level;
import org.apache.log4j.Logger;
/**
* Logs in a loop a number of times and measure the elapsed time.
*
* @author Ceki Gülcü
*/
public class LoggingLoop {
static int runLength;
static int command;
static final Logger logger = Logger.getLogger(LoggingLoop.class);
static final double MILLION = 1000 * 1000.0;
static final int WARM = 1000 * 100;
static final int ALL = 0;
static final int NOLOG_BAD = 1;
static final int NOLOG_BETTER = 2;
static final int NOLOG_NOPARAM = 3;
static final int LOG_BAD = 4;
static final int LOG_BETTER = 5;
static final int LOG_NOPARAM = 6;
public static void main(String[] args) throws Exception {
Logger root = Logger.getRootLogger();
if (args.length == 2) {
init(args[0], args[1]);
} else {
usage("Wrong number of arguments.");
}
switch(command) {
case ALL:
case NOLOG_BAD:
root.setLevel(Level.OFF);
loopBad();
if(command != ALL) break;
case NOLOG_BETTER:
root.setLevel(Level.OFF);
loopBetter();
if(command != ALL) break;
case NOLOG_NOPARAM:
root.setLevel(Level.OFF);
loopNoParam();
if(command != ALL) break;
case LOG_BAD:
setNullAppender();
// loopBad();
if(command != ALL) break;
case LOG_BETTER:
setNullAppender();
// loopBetter();
if(command != ALL) break;
case LOG_NOPARAM:
setNullAppender();
// loopNoParam();
if(command != ALL) break;
}
System.out.println("Done.");
}
static void usage(String msg) {
System.err.println(msg);
System.err.println(
"Usage: java " + LoggingLoop.class.getName() + " runLength configFile");
System.err.println("\trunLength (integer) is the length of test loop.");
System.exit(1);
}
static void init(String runLengthStr, String commandStr)
throws Exception {
runLength = Integer.parseInt(runLengthStr);
if ("nolog-bad".equalsIgnoreCase(commandStr)) {
command = NOLOG_BAD;
} else if ("nolog-better".equalsIgnoreCase(commandStr)) {
command = NOLOG_BETTER;
} else if ("nolog-noparam".equalsIgnoreCase(commandStr)) {
command = NOLOG_NOPARAM;
} else if ("log-bad".equalsIgnoreCase(commandStr)) {
command = LOG_BAD;
} else if ("log-better".equalsIgnoreCase(commandStr)) {
command = LOG_BETTER;
} else if ("log-noparam".equalsIgnoreCase(commandStr)) {
command = LOG_NOPARAM;
} else if ("all".equalsIgnoreCase(commandStr)) {
command = ALL;
}
}
static void setNullAppender() throws Exception {
Appender na = new NullAppender();
//ConsoleAppender na = new ConsoleAppender(new PatternLayout());
//Appender na = new FileAppender(new PatternLayout(), "toto.log");
Logger root = Logger.getRootLogger();
root.removeAllAppenders();
root.addAppender(na);
root.setLevel(Level.DEBUG);
}
static void loopBad() {
Integer x = new Integer(10);
for (int i = 0; i < WARM; i++) {
logger.debug("Entry number: {} is {}.", new Object[]{x, x});
//logger.debug("Entry number: {} is {}.", new Object[]{new Integer(i), x});
//logger.debug("Entry number: {} is {}.", new Object[]{new Integer(i), new Integer(i)});
}
Runtime.getRuntime().gc();
long before = System.currentTimeMillis();
for (int i = 0; i < runLength; i++) {
logger.debug("Entry number: {} is {}.", new Object[]{x, x});
///logger.debug("Entry number: {} is {}.", new Object[]{new Integer(i), x});
//logger.debug("Entry number: {} is {}.", new Object[]{new Integer(i), new Integer(i)});
}
long elapsedTime = System.currentTimeMillis() - before;
double average = (elapsedTime * MILLION) / runLength;
System.out.println(
"Bad loop completed in [" + elapsedTime + "] milliseconds, or ["
+ average + "] nanoseconds per log.");
}
static void loopBetter() {
Integer x = new Integer(5);
for (int i = 0; i < WARM; i++) {
//logger.debug("Entry number: {} is {}.", x, x);
logger.debug("Entry number: {} is {}.", x, new Integer(i));
//logger.debug("Entry number: {} is {}.", new Integer(i), new Integer(i));
}
Runtime.getRuntime().gc();
long before = System.currentTimeMillis();
for (int i = 0; i < runLength; i++) {
//logger.debug("Entry number: {} is {}.", x, x);
logger.debug("Entry number: {} is {}.", x, new Integer(i));
//logger.debug("Entry number: {} is {}.", new Integer(i), new Integer(i));
}
long elapsedTime = System.currentTimeMillis() - before;
double average = (elapsedTime * MILLION) / runLength;
System.out.println(
"Better loop completed in [" + elapsedTime + "] milliseconds, or ["
+ average + "] nanoseconds per log.");
}
static void loopNoParam() {
String msg = "Some message of medium length.";
Runtime.getRuntime().gc();
long before = System.currentTimeMillis();
for (int i = 0; i < runLength; i++) {
logger.debug(msg);
}
long elapsedTime = System.currentTimeMillis() - before;
double average = (elapsedTime * MILLION) / runLength;
System.out.println(
"No parameter loop completed in [" + elapsedTime
+ "] milliseconds, or [" + average + "] nanoseconds per log.");
}
}