1 /* 2 * Copyright (c) 2003, 2004, 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.getProcessCpuTime() 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/Linux: 35 * 1. In a shell, enter the command: "ps -ef" 36 * 2. The value (reported in seconds) is in the "TIME" column for the process 37 * Windows NT/XP/2000: 38 * 1. Hit Ctrl-Alt-Delete, select Task Manager, select Processes tab 39 * 2. The value (reported in seconds) is in the "CPU Time" column for the 40 * process. You may have to add this column via View menu-> Select 41 * Columns... item. 42 * Windows 98/ME: 43 * Not supported. 44 */ 45 46 import com.sun.management.OperatingSystemMXBean; 47 import java.lang.management.*; 48 49 public class GetProcessCpuTime { 50 51 private static OperatingSystemMXBean mbean = 52 (com.sun.management.OperatingSystemMXBean) 53 ManagementFactory.getOperatingSystemMXBean(); 54 55 56 // Careful with these values. 57 private static final long MIN_TIME_FOR_PASS = 1; 58 private static final long MAX_TIME_FOR_PASS = Long.MAX_VALUE; 59 60 // No max time. 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 // Consume cpu time 70 double sum=0; 71 for (int i=0; i <=2000000; i++) { 72 sum += i; 73 sum /= i; 74 } 75 76 long ns = mbean.getProcessCpuTime(); 77 if (ns == -1) { 78 System.out.println("getProcessCpuTime() is not supported"); 79 return; 80 } 81 82 if (trace) { 83 System.out.println("Process CPU time in ns: " + ns); 84 } 85 86 if (ns < MIN_TIME_FOR_PASS || ns > MAX_TIME_FOR_PASS) { 87 throw new RuntimeException("Process CPU time " + 88 "illegal value: " + ns + " ns " + 89 "(MIN = " + MIN_TIME_FOR_PASS + "; " + 90 "MAX = " + MAX_TIME_FOR_PASS + ")"); 91 } 92 93 System.out.println("Test passed."); 94 } 95 }