| /* |
| * Copyright (c) 2010, 2016, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * @test TestMBeanCMS.java |
| * @bug 6581734 |
| * @requires vm.gc.ConcMarkSweep |
| * @summary CMS Old Gen's collection usage is zero after GC which is incorrect |
| * @modules java.management |
| * @run main/othervm -Xmx512m -verbose:gc -XX:+UseConcMarkSweepGC TestMBeanCMS |
| * |
| */ |
| |
| import java.lang.management.GarbageCollectorMXBean; |
| import java.lang.management.ManagementFactory; |
| import java.lang.management.MemoryPoolMXBean; |
| import java.util.LinkedList; |
| import java.util.List; |
| |
| // 6581734 states that memory pool usage via the mbean is wrong |
| // for CMS (zero, even after a collection). |
| // |
| // 6580448 states that the collection count similarly is wrong |
| // (stays at zero for CMS collections) |
| // -- closed as dup of 6581734 as the same fix resolves both. |
| |
| |
| public class TestMBeanCMS { |
| |
| private String poolName = "CMS"; |
| private String collectorName = "ConcurrentMarkSweep"; |
| |
| public static void main(String [] args) { |
| |
| TestMBeanCMS t = null; |
| if (args.length==2) { |
| t = new TestMBeanCMS(args[0], args[1]); |
| } else { |
| System.out.println("Defaulting to monitor CMS pool and collector."); |
| t = new TestMBeanCMS(); |
| } |
| t.run(); |
| } |
| |
| public TestMBeanCMS(String pool, String collector) { |
| poolName = pool; |
| collectorName = collector; |
| } |
| |
| public TestMBeanCMS() { |
| } |
| |
| public void run() { |
| // Use some memory, enough that we expect collections should |
| // have happened. |
| // Must run with options to ensure no stop the world full GC, |
| // but e.g. at least one CMS cycle. |
| allocationWork(300*1024*1024); |
| System.out.println("Done allocationWork"); |
| |
| // Verify some non-zero results are stored. |
| List<MemoryPoolMXBean> pools = ManagementFactory.getMemoryPoolMXBeans(); |
| int poolsFound = 0; |
| int poolsWithStats = 0; |
| for (int i=0; i<pools.size(); i++) { |
| MemoryPoolMXBean pool = pools.get(i); |
| String name = pool.getName(); |
| System.out.println("found pool: " + name); |
| |
| if (name.contains(poolName)) { |
| long usage = pool.getCollectionUsage().getUsed(); |
| System.out.println(name + ": usage after GC = " + usage); |
| poolsFound++; |
| if (usage > 0) { |
| poolsWithStats++; |
| } |
| } |
| } |
| if (poolsFound == 0) { |
| throw new RuntimeException("No matching memory pools found: test with -XX:+UseConcMarkSweepGC"); |
| } |
| |
| List<GarbageCollectorMXBean> collectors = ManagementFactory.getGarbageCollectorMXBeans(); |
| int collectorsFound = 0; |
| int collectorsWithTime= 0; |
| for (int i=0; i<collectors.size(); i++) { |
| GarbageCollectorMXBean collector = collectors.get(i); |
| String name = collector.getName(); |
| System.out.println("found collector: " + name); |
| if (name.contains(collectorName)) { |
| collectorsFound++; |
| System.out.println(name + ": collection count = " |
| + collector.getCollectionCount()); |
| System.out.println(name + ": collection time = " |
| + collector.getCollectionTime()); |
| if (collector.getCollectionCount() <= 0) { |
| throw new RuntimeException("collection count <= 0"); |
| } |
| if (collector.getCollectionTime() > 0) { |
| collectorsWithTime++; |
| } |
| } |
| } |
| // verify: |
| if (poolsWithStats < poolsFound) { |
| throw new RuntimeException("pools found with zero stats"); |
| } |
| |
| if (collectorsWithTime<collectorsFound) { |
| throw new RuntimeException("collectors found with zero time"); |
| } |
| System.out.println("Test passed."); |
| } |
| |
| public void allocationWork(long target) { |
| |
| long sizeAllocated = 0; |
| List list = new LinkedList(); |
| long delay = 50; |
| long count = 0; |
| |
| while (sizeAllocated < target) { |
| int size = 1024*1024; |
| byte [] alloc = new byte[size]; |
| if (count % 2 == 0) { |
| list.add(alloc); |
| sizeAllocated+=size; |
| System.out.print("."); |
| } |
| try { Thread.sleep(delay); } catch (InterruptedException ie) { } |
| count++; |
| } |
| } |
| |
| } |