edu.umn.cs.spatialHadoop.util.MemoryReporter.java Source code

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Here is the source code for edu.umn.cs.spatialHadoop.util.MemoryReporter.java

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/***********************************************************************
* Copyright (c) 2015 by Regents of the University of Minnesota.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Apache License, Version 2.0 which 
* accompanies this distribution and is available at
* http://www.opensource.org/licenses/apache2.0.php.
*
*************************************************************************/
package edu.umn.cs.spatialHadoop.util;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

/**
 * Runs a background daemon thread that keeps reporting the memory usage of
 * the JVM
 * @author Ahmed Eldawy
 *
 */
public class MemoryReporter implements Runnable {
    static final Log LOG = LogFactory.getLog(MemoryReporter.class);

    private String humanReadable(double size) {
        final String[] units = { "", "KB", "MB", "GB", "TB", "PB" };
        int unit = 0;
        while (unit < units.length && size > 1024) {
            size /= 1024;
            unit++;
        }
        return String.format("%.2f %s", size, units[unit]);
    }

    @Override
    public void run() {
        Runtime runtime = Runtime.getRuntime();
        while (true) {
            LOG.info(String.format("Free memory %s / Total memory %s", humanReadable(runtime.freeMemory()),
                    humanReadable(runtime.totalMemory())));
            try {
                Thread.sleep(1000 * 60);
            } catch (InterruptedException e) {
            }
        }
    }

    public static Thread startReporting() {
        Thread thread = new Thread(new MemoryReporter(), "MemReporter");
        thread.setDaemon(true);
        thread.start();
        return thread;
    }
}