Java Memory alignMemory(long numBytes)

Description

Most current VMs have memory alignment that places objects into heap space that is a multiple of 8 Bytes.

License

Open Source License

Parameter

Parameter	Description
numBytes	a parameter

Declaration

private static long alignMemory(long numBytes) 

Method Source Code

//package com.java2s;
/*//from   ww w .j  a  v  a 2  s . co  m
 * JBoss, Home of Professional Open Source.
 * See the COPYRIGHT.txt file distributed with this work for information
 * regarding copyright ownership.  Some portions may be licensed
 * to Red Hat, Inc. under one or more contributor license agreements.
 * 
 * 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., 51 Franklin Street, Fifth Floor, Boston, MA
 * 02110-1301 USA.
 */

public class Main {
    /**
     * Most current VMs have memory alignment that places objects into heap space that is a multiple of 8 Bytes.
     * This utility method helps with calculating the aligned size of an object.
     * @param numBytes
     * @return
     * @since 4.2
     */
    private static long alignMemory(long numBytes) {
        long remainder = numBytes % 8;
        if (remainder != 0) {
            numBytes += (8 - remainder);
        }
        return numBytes;
    }
}

Related

1. checkLowMemory()
2. checkMemory()
3. checkMinMemory(long min)
4. compactMemory()