Engineeringserver.com | Get CPU and memory usage statistics in Java application

Get CPU and memory usage statistics in Java application

(2 votes, average: 3.5 out of 5)

Loading ...

1,007 views

08.10.2008 by HappyFace in Java

For those that want to know how to see the CPU and memory usage statistics in a Java application here's a demo that P. Lawrey wrote.

Output
getCommittedVirtualMemorySize = 28811264
getFreePhysicalMemorySize = 1207009280
getFreeSwapSpaceSize = 3365294080
getProcessCpuTime = 109375000
getTotalPhysicalMemorySize = 2145497088
getTotalSwapSpaceSize = 4129447936
Calendars are surprisingly expensive. Creating 100000 Calendars
getCommittedVirtualMemorySize = 91783168
getFreePhysicalMemorySize = 1154912256
getFreeSwapSpaceSize = 3302273024
getProcessCpuTime = 671875000
getTotalPhysicalMemorySize = 2145497088
getTotalSwapSpaceSize = 4129447936

PLAIN TEXT

JAVA:

import java.lang.management.ManagementFactory;
import java.lang.management.OperatingSystemMXBean;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.util.ArrayList;
import java.util.Calendar;
import java.util.GregorianCalendar;
import java.util.List;
public class OSBeanTester {
public static void main(String... args) {
printUsage();
System.out.println("Calendars are surprisingly expensive. Creating 100000 Calendars");
List calendars = new ArrayList();
for (int i = 0; i <100000; i++)
calendars.add(new GregorianCalendar());
printUsage();
}
private static void printUsage() {
OperatingSystemMXBean operatingSystemMXBean = ManagementFactory.getOperatingSystemMXBean();
for (Method method : operatingSystemMXBean.getClass().getDeclaredMethods()) {
method.setAccessible(true);
if (method.getName().startsWith("get") && Modifier.isPublic(method.getModifiers())) {
Object value;
try {
value = method.invoke(operatingSystemMXBean);
} catch (Exception e) {
value = e;
}
System.out.println(method.getName() + " = " + value);
}
}
}
}