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.getProcessCpuTime() 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/Linux: 36 * 1. In a shell, enter the command: "ps -ef" 37 * 2. The value (reported in seconds) is in the "TIME" column for the process 38 * Windows NT/XP/2000: 39 * 1. Hit Ctrl-Alt-Delete, select Task Manager, select Processes tab 40 * 2. The value (reported in seconds) is in the "CPU Time" column for the 41 * process. You may have to add this column via View menu-> Select 42 * Columns... item. 43 * Windows 98/ME: 44 * Not supported. 45 */ 46 47 import com.sun.management.OperatingSystemMXBean; 48 import java.lang.management.*; 49 50 public class GetProcessCpuTime { 51 52 private static OperatingSystemMXBean mbean = 53 (com.sun.management.OperatingSystemMXBean) 54 ManagementFactory.getOperatingSystemMXBean(); 55 56 57 // Careful with these values. 58 private static final long MIN_TIME_FOR_PASS = 1; 59 private static final long MAX_TIME_FOR_PASS = Long.MAX_VALUE; 60 61 // No max time. 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 // Consume cpu time 71 double sum=0; 72 for (int i=0; i <=2000000; i++) { 73 sum += i; 74 sum /= i; 75 } 76 77 long ns = mbean.getProcessCpuTime(); 78 if (ns == -1) { 79 System.out.println("getProcessCpuTime() is not supported"); 80 return; 81 } 82 83 if (trace) { 84 System.out.println("Process CPU time in ns: " + ns); 85 } 86 87 if (ns < MIN_TIME_FOR_PASS || ns > MAX_TIME_FOR_PASS) { 88 throw new RuntimeException("Process CPU time " + 89 "illegal value: " + ns + " ns " + 90 "(MIN = " + MIN_TIME_FOR_PASS + "; " + 91 "MAX = " + MAX_TIME_FOR_PASS + ")"); 92 } 93 94 System.out.println("Test passed."); 95 } 96 }