1 /*
   2  * Copyright (c) 2015, 2016, 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  * @modules java.base/jdk.internal.misc
  31  * @library /test/lib
  32  * @library ../share
  33  * @run main/othervm -XX:+UsePerfData -XX:InitialHeapSize=128M -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcCauseTest02
  34  */
  35 import utils.*;
  36 
  37 public class GcCauseTest02 {
  38 
  39     private final static float targetMemoryUsagePercent = 0.7f;
  40 
  41     public static void main(String[] args) throws Exception {
  42 
  43         // We will be running "jstat -gc" tool
  44         JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().getPid());
  45 
  46         // Run once and get the  results asserting that they are reasonable
  47         JstatGcCauseResults measurement1 = jstatGcTool.measure();
  48         measurement1.assertConsistency();
  49 
  50         GcProvoker gcProvoker = new GcProvoker();
  51 
  52         // Eat metaspace and heap then run the tool again and get the results  asserting that they are reasonable
  53         gcProvoker.allocateAvailableMetaspaceAndHeap(targetMemoryUsagePercent);
  54         // Collect garbage. Also update VM statistics
  55         System.gc();
  56         JstatGcCauseResults measurement2 = jstatGcTool.measure();
  57         measurement2.assertConsistency();
  58 
  59         // Assert that space has been utilized acordingly
  60         JstatResults.assertSpaceUtilization(measurement2, targetMemoryUsagePercent);
  61     }
  62 }
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