1 /* 2 * Copyright (c) 2011, 2015, 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 TestFullGCount.java 26 * @bug 7072527 27 * @summary CMS: JMM GC counters overcount in some cases 28 * @modules java.management 29 * @run main/othervm -Xlog:gc TestFullGCCount 30 */ 31 import java.util.*; 32 import java.lang.management.*; 33 34 /* 35 * Originally for a specific failure in CMS, this test now monitors all 36 * collectors for double-counting of collections. 37 */ 38 public class TestFullGCCount { 39 40 static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); 41 42 public static void main(String[] args) { 43 int iterations = 20; 44 boolean failed = false; 45 String errorMessage = ""; 46 HashMap<String, List> counts = new HashMap<String, List>(); 47 48 // Prime the collection of count lists for all collectors. 49 for (int i = 0; i < collectors.size(); i++) { 50 GarbageCollectorMXBean collector = collectors.get(i); 51 counts.put(collector.getName(), new ArrayList<Long>(iterations)); 52 } 53 54 // Perform some gc, record collector counts. 55 for (int i = 0; i < iterations; i++) { 56 System.gc(); 57 addCollectionCount(counts, i); 58 } 59 60 // Check the increments: 61 // Old gen collectors should increase by one, 62 // New collectors may or may not increase. 63 // Any increase >=2 is unexpected. 64 for (String collector : counts.keySet()) { 65 System.out.println("Checking: " + collector); 66 67 for (int i = 0; i < iterations - 1; i++) { 68 List<Long> theseCounts = counts.get(collector); 69 long a = theseCounts.get(i); 70 long b = theseCounts.get(i + 1); 71 if (b - a >= 2) { | 1 /* 2 * Copyright (c) 2011, 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 TestFullGCCount.java 26 * @bug 7072527 27 * @summary CMS: JMM GC counters overcount in some cases 28 * @modules java.management 29 * @run main/othervm -Xlog:gc TestFullGCCount 30 */ 31 32 import java.lang.management.GarbageCollectorMXBean; 33 import java.lang.management.ManagementFactory; 34 import java.util.ArrayList; 35 import java.util.HashMap; 36 import java.util.List; 37 38 /* 39 * Originally for a specific failure in CMS, this test now monitors all 40 * collectors for double-counting of collections. 41 */ 42 public class TestFullGCCount { 43 44 static List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); 45 46 public static void main(String[] args) { 47 int iterations = 20; 48 boolean failed = false; 49 String errorMessage = ""; 50 HashMap<String, List> counts = new HashMap<>(); 51 52 // Prime the collection of count lists for all collectors. 53 for (int i = 0; i < collectors.size(); i++) { 54 GarbageCollectorMXBean collector = collectors.get(i); 55 counts.put(collector.getName(), new ArrayList<>(iterations)); 56 } 57 58 // Perform some gc, record collector counts. 59 for (int i = 0; i < iterations; i++) { 60 System.gc(); 61 addCollectionCount(counts, i); 62 } 63 64 // Check the increments: 65 // Old gen collectors should increase by one, 66 // New collectors may or may not increase. 67 // Any increase >=2 is unexpected. 68 for (String collector : counts.keySet()) { 69 System.out.println("Checking: " + collector); 70 71 for (int i = 0; i < iterations - 1; i++) { 72 List<Long> theseCounts = counts.get(collector); 73 long a = theseCounts.get(i); 74 long b = theseCounts.get(i + 1); 75 if (b - a >= 2) { |