1 /*

     2  * Copyright (c) 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  * @summary Test checks output displayed with jstat -gccause.

    27  *          Test scenario:

    28  *          test forces debuggee application call System.gc(), runs jstat and checks that

    29  *          cause of last garbage collection displayed by jstat (LGCC) is 'System.gc()'.

    30  * @library /test/lib/share/classes

    31  * @library ../share

    32  * @build common.*

    33  * @build utils.*

    34  *

    35  * @run main/othervm  -XX:+UsePerfData -Xms128M -XX:MaxMetaspaceSize=128M GcCauseTest03

    36  */

    37 import utils.*;

    38 

    39 public class GcCauseTest03 {

    40 

    41     private final static float targetMemoryUsagePercent = 0.7f;

    42 

    43     public static void main(String[] args) throws Exception {

    44 

    45         // We will be running "jstat -gc" tool

    46         JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().getPid());

    47 

    48         System.gc();

    49 

    50         // Run once and get the  results asserting that they are reasonable

    51         JstatGcCauseResults measurement = jstatGcTool.measure();

    52         measurement.assertConsistency();

    53 

    54         if (measurement.valueExists("LGCC")) {

    55             if (!"System.gc()".equals(measurement.getStringValue("LGCC"))) {

    56                 throw new RuntimeException("Unexpected GC cause: " + measurement.getStringValue("LGCC") + ", expected System.gc()");

    57             }

    58         }

    59 

    60     }

    61 }