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.getFreePhysicalMemorySize() 28 * @author Steve Bohne 29 * @modules jdk.management 30 */ 31 32 /* 33 * This test is just a sanity check and does not check for the correct 34 * value. The correct value should be checked manually: 35 * Solaris: 36 * 1. In a shell, enter the command: "sar -r 1" 37 * 2. The value (reported in pages) is in the "freemem" column. 38 * Linux: 39 * 1. In a shell, enter the command: "cat /proc/meminfo" 40 * 2. The value (reported in bytes) is in "Mem" entry, "free" column. 41 * Windows NT/XP/2000: 42 * 1. Hit Ctrl-Alt-Delete, select Task Manager, go to Performance tab. 43 * 2. The value (reported in Kbytes) is in the entry "Available" in the 44 * "Physical Memory" box. 45 * Windows 98/ME: 46 * 1. Run Start->Programs->Accessories->System Tools->System Information. 47 * 2. Use the "XXXMB RAM" and "XX% system resources free" to determine free 48 * physical memory. 49 */ 50 51 import com.sun.management.OperatingSystemMXBean; 52 import java.lang.management.*; 53 54 public class GetFreePhysicalMemorySize { 55 56 private static OperatingSystemMXBean mbean = 57 (com.sun.management.OperatingSystemMXBean) 58 ManagementFactory.getOperatingSystemMXBean(); 59 60 // Careful with these values. 61 private static final long MIN_SIZE_FOR_PASS = 1; 62 // Max size for pass dynamically determined below. 63 private static long max_size_for_pass = Long.MAX_VALUE; 64 65 private static boolean trace = false; 66 67 public static void main(String args[]) throws Exception { 68 if (args.length > 0 && args[0].equals("trace")) { 69 trace = true; 70 } 71 72 long max_size = mbean.getTotalPhysicalMemorySize(); 73 if (max_size > 0) { 74 max_size_for_pass = max_size; 75 } 76 77 long size = mbean.getFreePhysicalMemorySize(); 78 79 if (trace) { 80 System.out.println("Free physical memory size in bytes: " + size); 81 } 82 83 if (size < MIN_SIZE_FOR_PASS || size > max_size_for_pass) { 84 throw new RuntimeException("Free physical memory size " + 85 "illegal value: " + size + " bytes " + 86 "(MIN = " + MIN_SIZE_FOR_PASS + "; " + 87 "MAX = " + max_size_for_pass + ")"); 88 } 89 90 System.out.println("Test passed."); 91 } 92 }