1 /* 2 * Copyright (c) 2015, 2018, 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 import utils.*; 25 26 /* 27 * @test 28 * @summary Test checks the consistency of the output 29 * displayed with jstat -gccapacity. 30 * @requires vm.gc != "Z" & vm.gc != "Shenandoah" 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 GcCapacityTest 36 */ 37 public class GcCapacityTest { 38 39 public static void main(String[] args) throws Exception { 40 41 // We will be running "jstat -gc" tool 42 JstatGcCapacityTool jstatGcTool = new JstatGcCapacityTool(ProcessHandle.current().pid()); 43 44 // Run once and get the results asserting that they are reasonable 45 JstatGcCapacityResults measurement1 = jstatGcTool.measure(); 46 measurement1.assertConsistency(); 47 48 // Provoke a gc and verify the changed values 49 GcProvoker gcProvoker = new GcProvoker(); 50 gcProvoker.provokeGc(); 51 JstatGcCapacityResults measurement2 = jstatGcTool.measure(); 52 measurement2.assertConsistency(); 53 54 // Assert that the GC events count has increased 55 JstatResults.assertGCEventsIncreased(measurement1, measurement2); 56 57 // Provoke a gc again and verify the changed values 58 gcProvoker.provokeGc(); 59 JstatGcCapacityResults measurement3 = jstatGcTool.measure(); 60 measurement3.assertConsistency(); 61 62 // Assert that the GC events count has increased 63 JstatResults.assertGCEventsIncreased(measurement1, measurement2); 64 } 65 66 }