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 */ 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: "sar -r 1" 36 * 2. The value (reported in pages) is in the "freemem" column. 37 * Linux: 38 * 1. In a shell, enter the command: "cat /proc/meminfo" 39 * 2. The value (reported in bytes) is in "Mem" entry, "free" column. 40 * Windows NT/XP/2000: 41 * 1. Hit Ctrl-Alt-Delete, select Task Manager, go to Performance tab. 42 * 2. The value (reported in Kbytes) is in the entry "Available" in the 43 * "Physical Memory" box. 44 * Windows 98/ME: 45 * 1. Run Start->Programs->Accessories->System Tools->System Information. 46 * 2. Use the "XXXMB RAM" and "XX% system resources free" to determine free 47 * physical memory. 48 */ 49 50 import com.sun.management.OperatingSystemMXBean; 51 import java.lang.management.*; 52 53 public class GetFreePhysicalMemorySize { 54 55 private static OperatingSystemMXBean mbean = 56 (com.sun.management.OperatingSystemMXBean) 57 ManagementFactory.getOperatingSystemMXBean(); 58 59 // Careful with these values. 60 private static final long MIN_SIZE_FOR_PASS = 1; 61 // Max size for pass dynamically determined below. 62 private static long max_size_for_pass = Long.MAX_VALUE; 63 64 private static boolean trace = false; 65 66 public static void main(String args[]) throws Exception { 67 if (args.length > 0 && args[0].equals("trace")) { 68 trace = true; 69 } 70 71 long max_size = mbean.getTotalPhysicalMemorySize(); 72 if (max_size > 0) { 73 max_size_for_pass = max_size; 74 } 75 76 long size = mbean.getFreePhysicalMemorySize(); 77 78 if (trace) { 79 System.out.println("Free physical memory size in bytes: " + size); 80 } 81 82 if (size < MIN_SIZE_FOR_PASS || size > max_size_for_pass) { 83 throw new RuntimeException("Free physical memory size " + 84 "illegal value: " + size + " bytes " + 85 "(MIN = " + MIN_SIZE_FOR_PASS + "; " + 86 "MAX = " + max_size_for_pass + ")"); 87 } 88 89 System.out.println("Test passed."); 90 } 91 }