Java Memory Usage memoryUsage()

Here you can find the source of memoryUsage()

Description

memory Usage

License

Open Source License

Declaration

public static final String memoryUsage() 

Method Source Code

//package com.java2s;
/********************************************************************
 *
 * Copyright (c) 2006-2007 Berlin Brown and botnode.com  All Rights Reserved
 *
 * http://www.opensource.org/licenses/bsd-license.php
    /*  w  w w  . ja v  a 2s . c o m*/
 * All rights reserved.
    
 * Redistribution and use in source and binary forms, with or without modification,
 * are permitted provided that the following conditions are met:
    
 * * Redistributions of source code must retain the above copyright notice,
 * this list of conditions and the following disclaimer.
 * * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 * * Neither the name of the Botnode.com (Berlin Brown) nor
 * the names of its contributors may be used to endorse or promote
 * products derived from this software without specific prior written permission.
    
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Date: 1/5/2009
 *       7/15/2009 - Added Clojure 1.0, other performance fixes and cleanups.
 *       
 * Main Description: Light Log Viewer is a tool for making it easier to search log files.  
 * Light Log Viewer adds some text highlighting, quick key navigation to text files, simple graphs 
 * and charts for monitoring logs, file database to quickly navigate to files of interest, 
 * and HTML to PDF convert tool.  
 * Light Log was developed with a combination of Clojure 1.0, Java and Scala with use of libs, SWT 3.4, JFreeChart, iText. 
 * 
 * Quickstart : the best way to run the Light Log viewer is to click on the win32 batch script light_logs.bat
 * (you may need to edit the Linux script for Unix/Linux environments).
 * Edit the win32 script to add more heap memory or other parameters.
 * 
 * The clojure source is contained in : HOME/src/octane
 * The java source is contained in :  HOME/src/java/src
 * 
 * To build the java source, see : HOME/src/java/build.xml and build_pdf_gui.xml
 * 
 * Metrics: (as of 7/15/2009) Light Log Viewer consists of 6500 lines of Clojure code, and contains wrapper code
 *  around the Java source.  There are 2000+ lines of Java code in the Java library for Light Log Viewer.
 *  
 * Additional Development Notes: The SWT gui and other libraries are launched from a dynamic classloader.  Clojure is also
 *   started from the same code, and reflection is used to dynamically initiate Clojure. See the 'start' package.  The binary
 *   code is contained in the octane_start.jar library.
 *   
 * Home Page: http://code.google.com/p/lighttexteditor/
 * 
 * Contact: Berlin Brown <berlin dot brown at gmail.com>
 *********************************************************************/

public class Main {
    private static final Runtime runtime = Runtime.getRuntime();
    public static final double megabytes = 1024.0 * 1024.0;

    public static final String memoryUsage() {
        final StringBuffer buf = new StringBuffer(80);
        buf.append("(used:").append(usedMemorym());
        buf.append("M/").append(freeMemorym());
        buf.append("M [").append(totalMemorym());
        buf.append("M,").append(maxMemorym());
        buf.append("M ])");
        return buf.toString();
    }

    public static final int usedMemorym() {
        return (int) Math.floor((usedMemoryb() / megabytes));
    }

    public static final int freeMemorym() {
        return (int) Math.floor((freeMemoryb() / megabytes));
    }

    public static final int totalMemorym() {
        return (int) Math.floor((totalMemoryb() / megabytes));
    }

    public static final int maxMemorym() {
        return (int) Math.floor((maxMemoryb() / megabytes));
    }

    public static final long usedMemoryb() {
        return totalMemoryb() - freeMemoryb();
    }

    public static final long freeMemoryb() {
        return runtime.freeMemory();
    }

    public static final long totalMemoryb() {
        return runtime.totalMemory();
    }

    public static final long maxMemoryb() {
        return runtime.maxMemory();
    }
}

Related

  1. getPercentMemoryUsage()
  2. getStringMemoryUsage(String s)
  3. getUsageMemory()
  4. memoryUsage()
  5. memoryUsage()
  6. printMemoryUsage()
  7. reportMemoryUsage()
  8. showMemoryUsage()