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 6191542 27 * @summary Basic unit test of OperatingSystemMXBean.getCommittedVirtualMemorySize() 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: "ps -efly" 36 * 2. Find your process, and look in the "SZ" column. Reported in Kbytes. 37 * Linux: 38 * 1. In a shell, enter the command: "ps -efly" 39 * 2. Find your process, and look in the "SZ" column. Reported in Kbytes. 40 * Windows NT/XP/2000: 41 * 1. Hit Ctrl-Alt-Delete, select Task Manager, go to Processes tab. 42 * 2. Find your process and look in the "Mem Usage" column. Reported in 43 * Kbytes. 44 * Windows 98/ME: 45 * Not supported. 46 */ 47 48 import com.sun.management.OperatingSystemMXBean; 49 import java.lang.management.*; 50 51 public class GetCommittedVirtualMemorySize { 52 53 private static OperatingSystemMXBean mbean = 54 (com.sun.management.OperatingSystemMXBean) 55 ManagementFactory.getOperatingSystemMXBean(); 56 57 // Careful with these values. 58 private static final long MIN_SIZE_FOR_PASS = 1; 59 // Max size for pass dynamically determined below 60 private static long max_size_for_pass = Long.MAX_VALUE; 61 62 private static boolean trace = false; 63 64 public static void main(String args[]) throws Exception { 65 if (args.length > 0 && args[0].equals("trace")) { 66 trace = true; 67 } 68 69 // 4934082: On Linux, VM size *can* be larger than total swap 70 // size. Linux might not reserve swap memory immediately when 71 // a page is mmaped. This means that the reported committed 72 // memory size can grow beyond the swap limit. 73 long max_size = mbean.getTotalSwapSpaceSize() + 74 mbean.getTotalPhysicalMemorySize(); 75 76 if (max_size > 0) { 77 max_size_for_pass = max_size; 78 } 79 long size = mbean.getCommittedVirtualMemorySize(); 80 if (size == -1) { 81 System.out.println("getCommittedVirtualMemorySize() is not supported"); 82 return; 83 } 84 85 if (trace) { 86 System.out.println("Committed virtual memory size in bytes: " + 87 size); 88 } 89 90 if (size < MIN_SIZE_FOR_PASS || size > max_size_for_pass) { 91 throw new RuntimeException("Committed virtual memory size " + 92 "illegal value: " + size + " bytes " + 93 "(MIN = " + MIN_SIZE_FOR_PASS + "; " + 94 "MAX = " + max_size_for_pass + ")"); 95 } 96 97 System.out.println("Test passed."); 98 } 99 }