001 /**
002 * Copyright (c) 2010, SIB. All rights reserved.
003 *
004 * SIB (Swiss Institute of Bioinformatics) - http://www.isb-sib.ch Host -
005 * https://sourceforge.net/projects/javaprotlib/
006 *
007 * Redistribution and use in source and binary forms, with or without
008 * modification, are permitted provided that the following conditions are met:
009 * Redistributions of source code must retain the above copyright notice, this
010 * list of conditions and the following disclaimer. Redistributions in binary
011 * form must reproduce the above copyright notice, this list of conditions and
012 * the following disclaimer in the documentation and/or other materials provided
013 * with the distribution. Neither the name of the SIB/GENEBIO nor the names of
014 * its contributors may be used to endorse or promote products derived from this
015 * software without specific prior written permission.
016 *
017 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
018 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
019 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
020 * ARE DISCLAIMED. IN NO EVENT SHALL SIB/GENEBIO BE LIABLE FOR ANY DIRECT,
021 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
022 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
023 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
024 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
025 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
026 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
027 */
028 package org.expasy.jpl.commons.base.mem;
029
030
031 /**
032 * This class evaluates the amount of memory used, free and total.
033 *
034 * @author nikitin
035 *
036 * @version 1.0
037 *
038 */
039 public final class RunTimeMemoryEstimator {
040
041 private static long fSLEEP_INTERVAL = 500;
042
043 private static Runtime RUNTIME = Runtime.getRuntime();
044
045 private static final long maxMemory = RUNTIME.maxMemory();
046 private static long allocatedMemory;
047 private static long freeAllocatedMemory;
048
049 public static final long getUsedMemory() {
050 collectGarbage();
051 allocatedMemory = Runtime.getRuntime().totalMemory();
052
053 collectGarbage();
054 freeAllocatedMemory = Runtime.getRuntime().freeMemory();
055
056 return allocatedMemory - freeAllocatedMemory;
057 }
058
059 public static final long traceMemory() {
060 getUsedMemory();
061
062 System.out.println("allocated memory: " + allocatedMemory / 1024
063 + " KB");
064 System.out.println("allocated free memory: " + freeAllocatedMemory
065 / 1024 + " KB");
066 System.out.println("max memory: " + maxMemory / 1024 + " KB");
067 System.out.println("total free memory: " + getTotalFreeMemory() / 1024
068 + " KB");
069 return 0;
070 }
071
072 public static final long getTotalFreeMemory() {
073 return freeAllocatedMemory + maxMemory - allocatedMemory;
074 }
075
076 private static void collectGarbage() {
077 try {
078 System.gc();
079 Thread.sleep(fSLEEP_INTERVAL);
080 System.runFinalization();
081 Thread.sleep(fSLEEP_INTERVAL);
082 } catch (InterruptedException ex) {
083 ex.printStackTrace();
084 }
085 }
086
087 }