/*
* Copyright 1999-2005 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;
/**
Measures the time required to make a System.currentTimeMillis() and
Thread.currentThread().getName() calls.
<p>On an 233Mhz NT machine (JDK 1.1.7B) the
System.currentTimeMillis() call takes under half a microsecond to
complete whereas the Thread.currentThread().getName() call takes
about 4 micro-seconds.
*/
public class SystemTime {
static int RUN_LENGTH = 1000000;
static
public
void main(String[] args) {
double t = systemCurrentTimeLoop();
System.out.println("Average System.currentTimeMillis() call took " + t);
t = currentThreadNameloop();
System.out.println("Average Thread.currentThread().getName() call took "
+ t);
}
static
double systemCurrentTimeLoop() {
long before = System.currentTimeMillis();
long l;
for(int i = 0; i < RUN_LENGTH; i++) {
l = System.currentTimeMillis();
}
return (System.currentTimeMillis() - before)*1000.0/RUN_LENGTH;
}
static
double currentThreadNameloop() {
long before = System.currentTimeMillis();
String t;
for(int i = 0; i < RUN_LENGTH; i++) {
t = Thread.currentThread().getName();
}
return (System.currentTimeMillis() - before)*1000.0/RUN_LENGTH;
}
}