GcCauseTest01.java revision 12734:00bf892e5553 
1178825Sdfr/*
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7178825Sdfr * published by the Free Software Foundation.
8178825Sdfr *
9178825Sdfr * This code is distributed in the hope that it will be useful, but WITHOUT
10178825Sdfr * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11178825Sdfr * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
12178825Sdfr * version 2 for more details (a copy is included in the LICENSE file that
13233294Sstas * accompanied this code).
14178825Sdfr *
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
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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 * @modules java.base/jdk.internal.misc
32 * @library /test/lib
33 * @library ../share
34 * @requires vm.opt.ExplicitGCInvokesConcurrent != true
35 * @run main/othervm -XX:+UsePerfData -Xmx128M GcCauseTest01
36 */
37import utils.*;
38
39public class GcCauseTest01 {
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().pid());
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        // Provoke GC then run the tool again and get the results  asserting that they are reasonable
53        gcProvoker.provokeGc();
54        JstatGcCauseResults measurement2 = jstatGcTool.measure();
55        measurement2.assertConsistency();
56
57        // Assert the increase in GC events and time between the measurements
58        JstatResults.assertGCEventsIncreased(measurement1, measurement2);
59        JstatResults.assertGCTimeIncreased(measurement1, measurement2);
60
61        // Provoke GC 3rd time then run the tool 3rd time twice and get the results
62        // asserting that they are reasonable
63        gcProvoker.provokeGc();
64        JstatGcCauseResults measurement3 = jstatGcTool.measure();
65        measurement3.assertConsistency();
66
67        // Assert the increase in GC events and time between the measurements
68        JstatResults.assertGCEventsIncreased(measurement2, measurement3);
69        JstatResults.assertGCTimeIncreased(measurement2, measurement3);
70    }
71}
72