GcCauseTest01.java revision 10839:35cb720769c5
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 -Xmx128M 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