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 -gccause. 27 * Test scenario: 28 * test forces debuggee application call System.gc(), runs jstat and checks that 29 * cause of last garbage collection displayed by jstat (LGCC) is 'System.gc()'. 30 * @requires vm.gc != "Z" 31 * @modules java.base/jdk.internal.misc 32 * @library /test/lib 33 * @library ../share 34 * @run main/othervm -XX:+UsePerfData -Xmx128M -XX:MaxMetaspaceSize=128M GcCauseTest03 35 */ 36 import utils.*; 37 38 public class GcCauseTest03 { 39 40 private final static float targetMemoryUsagePercent = 0.7f; 41 42 public static void main(String[] args) throws Exception { 43 44 // We will be running "jstat -gc" tool 45 JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().pid()); 46 47 System.gc(); 48 49 // Run once and get the results asserting that they are reasonable 50 JstatGcCauseResults measurement = jstatGcTool.measure(); 51 measurement.assertConsistency(); 52 53 if (measurement.valueExists("LGCC")) { 54 if (!"System.gc()".equals(measurement.getStringValue("LGCC"))) { 55 throw new RuntimeException("Unexpected GC cause: " + measurement.getStringValue("LGCC") + ", expected System.gc()"); 56 } 57 } 58 59 } 60 }