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 * @run main/othervm -XX:+UsePerfData -Xmx128M GcTest01
39 */
40import utils.*;
41
42public class GcTest01 {
43
44    public static void main(String[] args) throws Exception {
45
46        // We will be running "jstat -gc" tool
47        JstatGcTool jstatGcTool = new JstatGcTool(ProcessHandle.current().pid());
48
49        // Run once and get the  results asserting that they are reasonable
50        JstatGcResults measurement1 = jstatGcTool.measure();
51        measurement1.assertConsistency();
52
53        GcProvoker gcProvoker = new GcProvoker();
54
55        // Provoke GC then run the tool again and get the results
56        // asserting that they are reasonable
57        gcProvoker.provokeGc();
58        JstatGcResults measurement2 = jstatGcTool.measure();
59        measurement2.assertConsistency();
60
61        // Assert the increase in GC events and time between the measurements
62        JstatResults.assertGCEventsIncreased(measurement1, measurement2);
63        JstatResults.assertGCTimeIncreased(measurement1, measurement2);
64
65        // Provoke GC again and get the results
66        // asserting that they are reasonable
67        gcProvoker.provokeGc();
68        JstatGcResults measurement3 = jstatGcTool.measure();
69        measurement3.assertConsistency();
70
71        // Assert the increase in GC events and time between the measurements
72        JstatResults.assertGCEventsIncreased(measurement2, measurement3);
73        JstatResults.assertGCTimeIncreased(measurement2, measurement3);
74
75    }
76
77}
78