| /* |
| * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test |
| * @summary Test checks output displayed with jstat -gccause. |
| * Test scenario: |
| * test several times provokes garbage collection in the debuggee application and after each garbage |
| * collection runs jstat. jstat should show that after garbage collection number of GC events and garbage |
| * collection time increase. |
| * @modules java.base/jdk.internal.misc |
| * @library /test/lib |
| * @library ../share |
| * @requires vm.opt.ExplicitGCInvokesConcurrent != true |
| * @run main/othervm -XX:+UsePerfData -Xmx128M GcCauseTest01 |
| */ |
| import utils.*; |
| |
| public class GcCauseTest01 { |
| |
| public static void main(String[] args) throws Exception { |
| |
| // We will be running "jstat -gc" tool |
| JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().pid()); |
| |
| // Run once and get the results asserting that they are reasonable |
| JstatGcCauseResults measurement1 = jstatGcTool.measure(); |
| measurement1.assertConsistency(); |
| |
| GcProvoker gcProvoker = new GcProvoker(); |
| |
| // Provoke GC then run the tool again and get the results asserting that they are reasonable |
| gcProvoker.provokeGc(); |
| JstatGcCauseResults measurement2 = jstatGcTool.measure(); |
| measurement2.assertConsistency(); |
| |
| // Assert the increase in GC events and time between the measurements |
| JstatResults.assertGCEventsIncreased(measurement1, measurement2); |
| JstatResults.assertGCTimeIncreased(measurement1, measurement2); |
| |
| // Provoke GC 3rd time then run the tool 3rd time twice and get the results |
| // asserting that they are reasonable |
| gcProvoker.provokeGc(); |
| JstatGcCauseResults measurement3 = jstatGcTool.measure(); |
| measurement3.assertConsistency(); |
| |
| // Assert the increase in GC events and time between the measurements |
| JstatResults.assertGCEventsIncreased(measurement2, measurement3); |
| JstatResults.assertGCTimeIncreased(measurement2, measurement3); |
| } |
| } |