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 24 /* 25 * @test 26 * @summary Test checks output displayed with jstat -gc. 27 * Test scenario: 28 * test several times provokes garbage collection 29 * in the debuggee application 30 * and after each garbage collection runs jstat. 31 * jstat should show that after garbage collection 32 * number of GC events and garbage 33 * collection time increase. 34 * @modules java.base/jdk.internal.misc 35 * @library /test/lib 36 * @library ../share 37 * @requires vm.opt.ExplicitGCInvokesConcurrent != true 38 * @run main/othervm -XX:+UsePerfData -Xmx128M GcTest01 39 */ 40 import utils.*; 41 42 public class GcTest01 { 43 44 public static void main(String[] args) throws Exception { 45 46 // We will be running "jstat -gc" tool 47 JstatGcTool jstatGcTool = new JstatGcTool(ProcessHandle.current().pid()); 48 49 // Run once and get the results asserting that they are reasonable 50 JstatGcResults measurement1 = jstatGcTool.measure(); 51 measurement1.assertConsistency(); 52 53 GcProvoker gcProvoker = new GcProvoker(); 54 55 // Provoke GC then run the tool again and get the results 56 // asserting that they are reasonable 57 gcProvoker.provokeGc(); 58 JstatGcResults measurement2 = jstatGcTool.measure(); 59 measurement2.assertConsistency(); 60 61 // Assert the increase in GC events and time between the measurements 62 JstatResults.assertGCEventsIncreased(measurement1, measurement2); 63 JstatResults.assertGCTimeIncreased(measurement1, measurement2); 64 65 // Provoke GC again and get the results 66 // asserting that they are reasonable 67 gcProvoker.provokeGc(); 68 JstatGcResults measurement3 = jstatGcTool.measure(); 69 measurement3.assertConsistency(); 70 71 // Assert the increase in GC events and time between the measurements 72 JstatResults.assertGCEventsIncreased(measurement2, measurement3); 73 JstatResults.assertGCTimeIncreased(measurement2, measurement3); 74 75 } 76 77 }