Skip to content

Instantly share code, notes, and snippets.

Embed
What would you like to do?
package com.cleantutorials.jconsole.cpu;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.util.Random;
/**
* A class to demonstrate the CPU usage in the system space and the user space
* as seen in JConsole. Note: Only to demonstrate an example, manually kill the
* process if you want to run the example or it can eat up a lot of resources.
*/
public class CPUUsage {
public static void main(String[] args) throws IOException, InterruptedException {
GenerateRandomNumner generator = new GenerateRandomNumner();
generator.setName("Random Generator");
generator.start();
}
}
/**
* Thread that generates lots of random number and write it to a file.
* Used in demonstrating the CPU time and User time in JConsole.
*/
class GenerateRandomNumner extends Thread {
@Override
public void run() {
File file = new File("random_numbers.txt");
Random rand = new Random();
try (BufferedWriter br = new BufferedWriter(new FileWriter(file))) {
for (int i = 0; i < 10000000; i++) {
// Contributes to the time executing calls in user space.
String randomNumer = Integer.toString(rand.nextInt());
// Contributes to the time executing calls in kernel space.
br.write(randomNumer + ",");
// Flush the buffer.
br.flush();
}
} catch (Exception e) {
e.printStackTrace();
}
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment