1 /*
   2  * Copyright (c) 2003, 2008, 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 HotspotRuntimeMBean.getTotalSafepointTime()
  28  * @author  Steve Bohne
  29  */
  30 
  31 /*
  32  * This test is just a sanity check and does not check for the correct value.
  33  */
  34 
  35 import sun.management.*;
  36 
  37 public class GetTotalSafepointTime {
  38 
  39     private static HotspotRuntimeMBean mbean =
  40         (HotspotRuntimeMBean)ManagementFactoryHelper.getHotspotRuntimeMBean();
  41 
  42     private static final long NUM_THREAD_DUMPS = 100;
  43 
  44     // Careful with these values.
  45     private static final long MIN_VALUE_FOR_PASS = 1;
  46     private static final long MAX_VALUE_FOR_PASS = Long.MAX_VALUE;
  47 
  48     private static boolean trace = false;
  49 
  50     public static void main(String args[]) throws Exception {
  51         if (args.length > 0 && args[0].equals("trace")) {
  52             trace = true;
  53         }
  54 
  55         // Thread.getAllStackTraces() should cause safepoints.
  56         // If this test is failing because it doesn't,
  57         // MIN_VALUE_FOR_PASS should be reset to 0
  58         for (int i = 0; i < NUM_THREAD_DUMPS; i++) {
  59              Thread.getAllStackTraces();
  60         }
  61 
  62         long value = mbean.getTotalSafepointTime();
  63 
  64         if (trace) {
  65             System.out.println("Total safepoint time (ms): " + value);
  66         }
  67 
  68         if (value < MIN_VALUE_FOR_PASS || value > MAX_VALUE_FOR_PASS) {
  69             throw new RuntimeException("Total safepoint time " +
  70                                        "illegal value: " + value + " ms " +
  71                                        "(MIN = " + MIN_VALUE_FOR_PASS + "; " +
  72                                        "MAX = " + MAX_VALUE_FOR_PASS + ")");
  73         }
  74 
  75         for (int i = 0; i < 2 * NUM_THREAD_DUMPS; i++) {
  76              Thread.getAllStackTraces();
  77         }
  78         long value2 = mbean.getTotalSafepointTime();
  79 
  80         if (trace) {
  81             System.out.println("Total safepoint time2 (ms): " + value2);
  82         }
  83 
  84         if (value2 <= value) {
  85             throw new RuntimeException("Total safepoint time " +
  86                                        "did not increase " +
  87                                        "(value = " + value + "; " +
  88                                        "value2 = " + value2 + ")");
  89         }
  90 
  91         System.out.println("Test passed.");
  92     }
  93 }