1 /*
   2  * Copyright (c) 2017, 2018, Red Hat, Inc. All rights reserved.
   3  *
   4  * This code is free software; you can redistribute it and/or modify it
   5  * under the terms of the GNU General Public License version 2 only, as
   6  * published by the Free Software Foundation.
   7  *
   8  * This code is distributed in the hope that it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  11  * version 2 for more details (a copy is included in the LICENSE file that
  12  * accompanied this code).
  13  *
  14  * You should have received a copy of the GNU General Public License version
  15  * 2 along with this work; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  17  *
  18  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  19  * or visit www.oracle.com if you need additional information or have any
  20  * questions.
  21  *
  22  */
  23 
  24 /**
  25  * @test TestMemoryMXBeans
  26  * @key gc
  27  * @summary Test JMX memory beans
  28  * @modules java.base/jdk.internal.misc
  29  *          java.management
  30  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC          -Xmx1g TestMemoryMXBeans   -1 1024
  31  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms1g   -Xmx1g TestMemoryMXBeans 1024 1024
  32  * @run main/othervm -XX:+UnlockExperimentalVMOptions -XX:+UseShenandoahGC -Xms128m -Xmx1g TestMemoryMXBeans  128 1024
  33  */
  34 
  35 import java.lang.management.*;
  36 import java.util.*;
  37 
  38 public class TestMemoryMXBeans {
  39 
  40     public static void main(String[] args) throws Exception {
  41         if (args.length < 2) {
  42             throw new IllegalStateException("Should provide expected heap sizes");
  43         }
  44 
  45         long initSize = 1L * Integer.parseInt(args[0]) * 1024 * 1024;
  46         long maxSize =  1L * Integer.parseInt(args[1]) * 1024 * 1024;
  47 
  48         testMemoryBean(initSize, maxSize);
  49     }
  50 
  51     public static void testMemoryBean(long initSize, long maxSize) {
  52         MemoryMXBean memoryMXBean = ManagementFactory.getMemoryMXBean();
  53         long heapInit = memoryMXBean.getHeapMemoryUsage().getInit();
  54         long heapMax = memoryMXBean.getHeapMemoryUsage().getMax();
  55         long nonHeapInit = memoryMXBean.getNonHeapMemoryUsage().getInit();
  56         long nonHeapMax = memoryMXBean.getNonHeapMemoryUsage().getMax();
  57 
  58         if (initSize > 0 && heapInit != initSize) {
  59             throw new IllegalStateException("Init heap size is wrong: " + heapInit + " vs " + initSize);
  60         }
  61         if (maxSize > 0 && heapMax != maxSize) {
  62             throw new IllegalStateException("Max heap size is wrong: " + heapMax + " vs " + maxSize);
  63         }
  64     }
  65 }