| /* |
| * Copyright (c) 2003, 2015, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @bug 4858522 |
| * @summary Basic unit test of OperatingSystemMXBean.getProcessCpuTime() |
| * @author Steve Bohne |
| */ |
| |
| /* |
| * This test is just a sanity check and does not check for the correct |
| * value. The correct value should be checked manually: |
| * Solaris/Linux: |
| * 1. In a shell, enter the command: "ps -ef" |
| * 2. The value (reported in seconds) is in the "TIME" column for the process |
| * Windows NT/XP/2000: |
| * 1. Hit Ctrl-Alt-Delete, select Task Manager, select Processes tab |
| * 2. The value (reported in seconds) is in the "CPU Time" column for the |
| * process. You may have to add this column via View menu-> Select |
| * Columns... item. |
| * Windows 98/ME: |
| * Not supported. |
| */ |
| |
| import com.sun.management.OperatingSystemMXBean; |
| import java.lang.management.*; |
| |
| public class GetProcessCpuTime { |
| |
| private static OperatingSystemMXBean mbean = |
| (com.sun.management.OperatingSystemMXBean) |
| ManagementFactory.getOperatingSystemMXBean(); |
| |
| |
| // Careful with these values. |
| private static final long MIN_TIME_FOR_PASS = 1; |
| private static final long MAX_TIME_FOR_PASS = Long.MAX_VALUE; |
| |
| // No max time. |
| |
| private static boolean trace = false; |
| |
| public static void main(String args[]) throws Exception { |
| if (args.length > 0 && args[0].equals("trace")) { |
| trace = true; |
| } |
| |
| // Consume cpu time |
| double sum=0; |
| for (int i=0; i <=2000000; i++) { |
| sum += i; |
| sum /= i; |
| } |
| |
| long ns = mbean.getProcessCpuTime(); |
| if (ns == -1) { |
| System.out.println("getProcessCpuTime() is not supported"); |
| return; |
| } |
| |
| if (trace) { |
| System.out.println("Process CPU time in ns: " + ns); |
| } |
| |
| if (ns < MIN_TIME_FOR_PASS || ns > MAX_TIME_FOR_PASS) { |
| throw new RuntimeException("Process CPU time " + |
| "illegal value: " + ns + " ns " + |
| "(MIN = " + MIN_TIME_FOR_PASS + "; " + |
| "MAX = " + MAX_TIME_FOR_PASS + ")"); |
| } |
| |
| System.out.println("Test passed."); |
| } |
| } |