Re: Large number of DefaultWriteFuture in jmap

2008-05-05 Thread Emmanuel Lecharny 

Frank Kim wrote:

 Hi guys,
  

Hi Franck,

it's something possible that you have slow clients, and in this case, 
they simply don't read data fast enough, which leads to some bottleneck.


This is under investigation.

--
--
cordialement, regards,
Emmanuel Lécharny
www.iktek.com
directory.apache.org

Re: Large number of DefaultWriteFuture in jmap

2008-05-04 Thread Frank Kim 
 Hi guys,

I am currently running Mina 1.1, and running into an issue with memory
management. Upon looking at the histo:live output of jmap command, I have
about 740K DefaultWriteFuture instances with 200-300 concurrent connections
running on a 4 cpu machine with 2GB of memory. I see CPU usage of 20-40%
with threadpool size of 32, so I am guessing that CPU isn't really a
bottleneck here. Let me know if anyone had similar situations.

/usr/java/default/bin/jmap -histo:live

 num #instances #bytes  class name
--
   1:722188  206147200  [C
   2:418454  102556400  [B
   3:123433   51348128  [Lcom.fantage.util.IntHashtableEntry;
   4:740888   23708416
org.apache.mina.common.support.DefaultWriteFuture
   5:785109   18842616
java.util.concurrent.locks.ReentrantLock$NonfairSync
   6:446793   17871720  java.util.HashMap
   7:741412   17793888  java.util.concurrent.CountDownLatch$Sync
   8:370455   17781840  java.nio.HeapByteBuffer
   9:740888   17781312
org.apache.mina.common.IoFilter$WriteRequest
  10:722851   17348424  java.lang.String
  11:332717   15970416  org.hibernate.collection.PersistentSet
  12:756153   13329280  [Ljava.lang.Object;
  13:743619   11897904  java.util.concurrent.locks.ReentrantLock
  14:743183   11890928
java.util.concurrent.ConcurrentLinkedQueue$Node
  15:741944   11871104
java.util.concurrent.atomic.AtomicBoolean
  16:741418   11862688
java.util.concurrent.CopyOnWriteArrayList
  17:741412   11862592  java.util.concurrent.CountDownLatch
  18: 13567   10051768  [I
  19:4468359882784  [Ljava.util.HashMap$Entry;
  20:3704458890680
org.apache.mina.common.SimpleByteBufferAllocator$SimpleByteBuffer
  21:4258946814304  java.util.HashSet
  22:3715035944048
java.util.concurrent.atomic.AtomicInteger
  23:3704445927104
org.apache.mina.filter.codec.ProtocolCodecFilter$HiddenByteBuffer
  24:3704445927104
org.apache.mina.filter.codec.ProtocolCodecFilter$MessageByteBuffer
  25: 478605791368  constMethodKlass
  26: 502775631024
com.fantage.dao.entity.Asset$$EnhancerByCGLIB$$fc9b9c8d
  27: 517145378256  com.fantage.dao.entity.Asset
  28: 478603834144  methodKlass

Thanks,
Frank