GcCauseTest01.java revision 10206:78f06e5daedf 
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 *          test several times provokes garbage collection in the debuggee application and after each garbage
29 *          collection runs jstat. jstat should show that after garbage collection number of GC events and garbage
30 *          collection time increase.
31 * @library /test/lib/share/classes
32 * @library ../share
33 * @requires vm.opt.ExplicitGCInvokesConcurrent != true
34 * @build common.*
35 * @build utils.*
36 *
37 * @run main/othervm -XX:+UsePerfData GcCauseTest01
38 */
39import utils.*;
40
41public class GcCauseTest01 {
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        // Provoke GC then run the tool again and get the results  asserting that they are reasonable
55        gcProvoker.provokeGc();
56        JstatGcCauseResults measurement2 = jstatGcTool.measure();
57        measurement2.assertConsistency();
58
59        // Assert the increase in GC events and time between the measurements
60        JstatResults.assertGCEventsIncreased(measurement1, measurement2);
61        JstatResults.assertGCTimeIncreased(measurement1, measurement2);
62
63        // Provoke GC 3rd time then run the tool 3rd time twice and get the results
64        // asserting that they are reasonable
65        gcProvoker.provokeGc();
66        JstatGcCauseResults measurement3 = jstatGcTool.measure();
67        measurement3.assertConsistency();
68
69        // Assert the increase in GC events and time between the measurements
70        JstatResults.assertGCEventsIncreased(measurement2, measurement3);
71        JstatResults.assertGCTimeIncreased(measurement2, measurement3);
72    }
73}
74