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  *          tests forces debuggee application eat ~70% of heap and runs jstat.

    29  *          jstat should show that ~70% of heap (OC/OU ~= 70%).

    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 GcCauseTest02

    36  */

    37 import utils.*;

    38 

    39 public class GcCauseTest02 {

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

    49         JstatGcCauseResults measurement1 = jstatGcTool.measure();

    50         measurement1.assertConsistency();

    51 

    52         GcProvoker gcProvoker = GcProvoker.createGcProvoker();

    53 

    54         // Eat metaspace and heap then run the tool again and get the results  asserting that they are reasonable

    55         gcProvoker.eatMetaspaceAndHeap(targetMemoryUsagePercent);

    56         JstatGcCauseResults measurement2 = jstatGcTool.measure();

    57         measurement2.assertConsistency();

    58 

    59         // Assert that space has been utilized acordingly

    60         JstatResults.assertSpaceUtilization(measurement2, targetMemoryUsagePercent);

    61     }

    62 }