1 /*
   2  * Copyright (c) 2015, 2017, 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 -gc.
  27  *          Test scenario:
  28  *          test several times provokes garbage collection
  29  *          in the debuggee application
  30  *          and after each garbage collection runs jstat.
  31  *          jstat should show that after garbage collection
  32  *          number of GC events and garbage
  33  *          collection time increase.
  34  * @modules java.base/jdk.internal.misc
  35  * @library /test/lib
  36  * @library ../share
  37  * @requires vm.opt.ExplicitGCInvokesConcurrent != true
  38  * @requires vm.gc != "Z" & vm.gc != "Shenandoah"
  39  * @run main/othervm -XX:+UsePerfData -Xmx128M GcTest01
  40  */
  41 import utils.*;
  42 
  43 public class GcTest01 {
  44 
  45     public static void main(String[] args) throws Exception {
  46 
  47         // We will be running "jstat -gc" tool
  48         JstatGcTool jstatGcTool = new JstatGcTool(ProcessHandle.current().pid());
  49 
  50         // Run once and get the  results asserting that they are reasonable
  51         JstatGcResults measurement1 = jstatGcTool.measure();
  52         measurement1.assertConsistency();
  53 
  54         GcProvoker gcProvoker = new GcProvoker();
  55 
  56         // Provoke GC then run the tool again and get the results
  57         // asserting that they are reasonable
  58         gcProvoker.provokeGc();
  59         JstatGcResults measurement2 = jstatGcTool.measure();
  60         measurement2.assertConsistency();
  61 
  62         // Assert the increase in GC events and time between the measurements
  63         JstatResults.assertGCEventsIncreased(measurement1, measurement2);
  64         JstatResults.assertGCTimeIncreased(measurement1, measurement2);
  65 
  66         // Provoke GC again and get the results
  67         // asserting that they are reasonable
  68         gcProvoker.provokeGc();
  69         JstatGcResults measurement3 = jstatGcTool.measure();
  70         measurement3.assertConsistency();
  71 
  72         // Assert the increase in GC events and time between the measurements
  73         JstatResults.assertGCEventsIncreased(measurement2, measurement3);
  74         JstatResults.assertGCTimeIncreased(measurement2, measurement3);
  75 
  76     }
  77 
  78 }
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