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
49import com.sun.management.OperatingSystemMXBean;
50import java.lang.management.*;
51
52public 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}
91