1 /*

     2  * Copyright 2003-2004 Sun Microsystems, Inc.  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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,

    20  * CA 95054 USA or visit www.sun.com if you need additional information or

    21  * have any 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)ManagementFactory.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 }