1 /* 2 * Copyright (c) 2013, 2019, 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. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package jdk.jfr.event.gc.objectcount; 27 28 import java.util.List; 29 import java.util.HashMap; 30 31 import jdk.jfr.consumer.RecordedEvent; 32 import jdk.testlibrary.Asserts; 33 import jdk.testlibrary.jfr.Events; 34 35 class Foo { 36 } 37 38 class Constants { 39 public static final int oneMB = 1048576; 40 } 41 42 public class ObjectCountEventVerifier { 43 public static Foo[] foos; 44 45 public static void createTestData() { 46 foos = new Foo[Constants.oneMB]; 47 } 48 49 public static void verify(List<RecordedEvent> objectCountEvents) throws Exception { 50 Asserts.assertFalse(objectCountEvents.isEmpty(), "Expected at least one object count event"); 51 // Object count events should be sent only for those classes which instances occupy over 0.5% 52 // of the heap. Therefore there can't be more than 200 events 53 Asserts.assertLessThanOrEqual(objectCountEvents.size(), 200, "Expected at most 200 object count events"); 54 55 HashMap<String, Long> numInstancesOfClass = new HashMap<String, Long>(); 56 HashMap<String, Long> sizeOfInstances = new HashMap<String, Long>(); 57 58 for (RecordedEvent event : objectCountEvents) { 59 String className = Events.assertField(event, "objectClass.name").notEmpty().getValue(); 60 long count = Events.assertField(event, "count").atLeast(0L).getValue(); 61 long totalSize = Events.assertField(event, "totalSize").atLeast(1L).getValue(); 62 System.out.println(className); 63 numInstancesOfClass.put(className, count); 64 sizeOfInstances.put(className, totalSize); 65 } 66 System.out.println(numInstancesOfClass); 67 final String fooArrayName = "[Ljdk/jfr/event/gc/objectcount/Foo;"; 68 Asserts.assertTrue(numInstancesOfClass.containsKey(fooArrayName), "Expected an event for the Foo array"); 69 Asserts.assertEquals(sizeOfInstances.get(fooArrayName), expectedFooArraySize(Constants.oneMB), "Wrong size of the Foo array"); 70 } 71 72 private static long expectedFooArraySize(long count) { 73 boolean runsOn32Bit = System.getProperty("sun.arch.data.model").equals("32"); 74 int bytesPerWord = runsOn32Bit ? 4 : 8; 75 int objectHeaderSize = bytesPerWord * 3; // length will be aligned on 64 bits 76 int alignmentInOopArray = runsOn32Bit ? 4 : 0; 77 int ptrSize = bytesPerWord; 78 return objectHeaderSize + alignmentInOopArray + count * ptrSize; 79 } 80 }