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 import utils.*;
  25 /*
  26  * @test
  27  * @summary Test checks output displayed with jstat -gcnew.
  28  *          Test scenario:
  29  *          test several times provokes garbage collection in the debuggee application and after each garbage
  30  *          collection runs jstat. jstat should show that after garbage collection number of GC events and garbage
  31  *          collection time increase.
  32  * @modules java.base/jdk.internal.misc
  33  * @library /test/lib
  34  * @library ../share
  35  * @run main/othervm -XX:+UsePerfData -Xmx128M GcNewTest
  36  */
  37 
  38 public class GcNewTest {
  39 
  40     public static void main(String[] args) throws Exception {
  41 
  42         // We will be running "jstat -gc" tool
  43         JstatGcNewTool jstatGcTool = new JstatGcNewTool(ProcessHandle.current().pid());
  44 
  45         // Run once and get the  results asserting that they are reasonable
  46         JstatGcNewResults measurement1 = jstatGcTool.measure();
  47         measurement1.assertConsistency();
  48 
  49         GcProvoker gcProvoker = new GcProvoker();
  50 
  51         // Provoke GC and run the tool again
  52         gcProvoker.provokeGc();
  53         JstatGcNewResults measurement2 = jstatGcTool.measure();
  54         measurement2.assertConsistency();
  55 
  56         // Assert the increase in GC events and time between the measurements
  57         assertThat(measurement2.getFloatValue("YGC") > measurement1.getFloatValue("YGC"), "YGC didn't increase between measurements 1 and 2");
  58         assertThat(measurement2.getFloatValue("YGCT") > measurement1.getFloatValue("YGCT"), "YGCT time didn't increase between measurements 1 and 2");
  59 
  60         // Provoke GC and run the tool again
  61         gcProvoker.provokeGc();
  62         JstatGcNewResults measurement3 = jstatGcTool.measure();
  63         measurement3.assertConsistency();
  64 
  65         // Assert the increase in GC events and time between the measurements
  66         assertThat(measurement3.getFloatValue("YGC") > measurement2.getFloatValue("YGC"), "YGC didn't increase between measurements 1 and 2");
  67         assertThat(measurement3.getFloatValue("YGCT") > measurement2.getFloatValue("YGCT"), "YGCT time didn't increase between measurements 1 and 2");
  68 
  69     }
  70 
  71     private static void assertThat(boolean result, String message) {
  72         if (!result) {
  73             throw new RuntimeException(message);
  74         };
  75     }
  76 }