/*******************************************************************************
* ALMA - Atacama Large Millimeter Array
* Copyright (c) ESO - European Southern Observatory, 2011
* (in the framework of the ALMA collaboration).
* All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*******************************************************************************/
package alma.acs.util;
public class MemoryUtil
{
/**
* Uses {@link Runtime} calls to generate a string of the form
* <code>Memory usage 2555 of 15872 kB (= 1.0% of JVM growth limit 253440 kB) </code>.
*/
public static String getHeapSizeMessage() {
Runtime rt = Runtime.getRuntime();
long totalMemKB = rt.totalMemory() / 1024;
long usedMemKB = totalMemKB - rt.freeMemory() / 1024;
String memStatus = "Memory usage " + usedMemKB + " of " + totalMemKB + " kB ";
long maxMem = rt.maxMemory();
if (maxMem < Long.MAX_VALUE) {
long maxMemKB = maxMem / 1024;
memStatus += "(= " + (usedMemKB * 1000 / maxMemKB) / 10.0 + "% of JVM growth limit " + maxMemKB + " kB) ";
}
return memStatus;
}
}