1 /*
   2  * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 /*
  25  * @test
  26  * @bug     4858522
  27  * @summary Basic unit test of OperatingSystemMXBean.getTotalPhysicalMemorySize()
  28  * @author  Steve Bohne
  29  */
  30 
  31 /*
  32  * This test is just a sanity check and does not check for the correct
  33  * value.  The correct value should be checked manually:
  34  * Solaris:
  35  *   1. In a shell, enter the command: "prtconf"
  36  *   2. The value (reported in MBytes) is in the "Memory size" entry.
  37  * Linux:
  38  *   1. In a shell, enter the command: "cat /proc/meminfo"
  39  *   2. The value (reported in bytes) is in "Mem" entry, "total" column.
  40  * Windows NT/XP/2000:
  41  *   1. Hit Ctrl-Alt-Delete, select Task Manager, select Performance tab
  42  *   2. The value (reported in Kbytes) is in the "Physical Memory" box,
  43  *      in the "Total" entry.
  44  * Windows 98/ME:
  45  *   1. Right click on My Computer, select Properties.  Go to Performance tab.
  46  *   2. Total memory should be listed in the panel.
  47  */
  48 
  49 import com.sun.management.OperatingSystemMXBean;
  50 import java.lang.management.*;
  51 
  52 public class GetTotalPhysicalMemorySize {
  53 
  54     private static OperatingSystemMXBean mbean =
  55         (com.sun.management.OperatingSystemMXBean)
  56         ManagementFactory.getOperatingSystemMXBean();
  57 
  58     // Careful with these values.
  59     // Min size for pass dynamically determined below.
  60     private static long       min_size_for_pass = 1;
  61     private static final long MAX_SIZE_FOR_PASS = Long.MAX_VALUE;
  62 
  63     private static boolean trace = false;
  64 
  65     public static void main(String args[]) throws Exception {
  66         if (args.length > 0 && args[0].equals("trace")) {
  67             trace = true;
  68         }
  69 
  70         long min_size = mbean.getFreePhysicalMemorySize();
  71         if (min_size > 0) {
  72             min_size_for_pass = min_size;
  73         }
  74 
  75         long size = mbean.getTotalPhysicalMemorySize();
  76 
  77         if (trace) {
  78             System.out.println("Total physical memory size in bytes: " + size);
  79         }
  80 
  81         if (size < min_size_for_pass || size > MAX_SIZE_FOR_PASS) {
  82             throw new RuntimeException("Total physical memory size " +
  83                                        "illegal value: " + size + " bytes " +
  84                                        "(MIN = " + min_size_for_pass + "; " +
  85                                        "MAX = " + MAX_SIZE_FOR_PASS + ")");
  86         }
  87 
  88         System.out.println("Test passed.");
  89     }
  90 }