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
24import 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
38public 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}
77