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 * tests forces debuggee application eat ~70% of heap and runs jstat. 29 * jstat should show that ~70% of heap (OC/OU ~= 70%). 30 * @modules java.base/jdk.internal.misc 31 * @library /test/lib 32 * @library ../share 33 * @run main/othervm -XX:+UsePerfData -XX:InitialHeapSize=128M -XX:MaxHeapSize=128M -XX:MaxMetaspaceSize=128M GcCauseTest02 34 */ 35 import utils.*; 36 37 public class GcCauseTest02 { 38 39 private final static float targetMemoryUsagePercent = 0.7f; 40 41 public static void main(String[] args) throws Exception { 42 43 // We will be running "jstat -gc" tool 44 JstatGcCauseTool jstatGcTool = new JstatGcCauseTool(ProcessHandle.current().getPid()); 45 46 // Run once and get the results asserting that they are reasonable 47 JstatGcCauseResults measurement1 = jstatGcTool.measure(); 48 measurement1.assertConsistency(); 49 50 GcProvoker gcProvoker = new GcProvoker(); 51 52 // Eat metaspace and heap then run the tool again and get the results asserting that they are reasonable 53 gcProvoker.allocateAvailableMetaspaceAndHeap(targetMemoryUsagePercent); 54 // Collect garbage. Also update VM statistics 55 System.gc(); 56 JstatGcCauseResults measurement2 = jstatGcTool.measure(); 57 measurement2.assertConsistency(); 58 59 // Assert that space has been utilized acordingly 60 JstatResults.assertSpaceUtilization(measurement2, targetMemoryUsagePercent); 61 } 62 }