Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

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  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

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  * 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.

  *

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 /*

  * @test Test6581734.java

  * @bug 6581734

  * @summary CMS Old Gen's collection usage is zero after GC which is incorrect

  * @run main/othervm -Xmx512m -verbose:gc -XX:+UseConcMarkSweepGC Test6581734

  *

  */

 import java.util.*;

 import java.lang.management.*;

 // 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 Test6581734 {

     private String poolName = "CMS";

     private String collectorName = "ConcurrentMarkSweep";

     public static void main(String [] args) {

         Test6581734 t = null;

         if (args.length==2) {

             t = new Test6581734(args[0], args[1]);

         } else {

             System.out.println("Defaulting to monitor CMS pool and collector.");

             t = new Test6581734();

         }

         t.run();

     }

     public Test6581734(String pool, String collector) {

         poolName = pool;

         collectorName = collector;

     }

     public Test6581734() {

     }

     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++;

         }

     }

 }