memory leak? a problem about DownstreamMessageEvent

Tue Jan 4 08:31:36 EST 2011

MAT leak report:

Leak Suspects
System Overview
Leaks
Problem Suspect 1

The class "java.lang.ref.Finalizer", loaded by "<system class loader>",
occupies 58,865,592 (43.21%) bytes.

Keywords
java.lang.ref.Finalizer
Details »
Problem Suspect 2

8,088 instances of
"org.jboss.netty.channel.socket.nio.NioAcceptedSocketChannel", loaded by
"sun.misc.Launcher$AppClassLoader @ 0x2aaab362b4f8" occupy 14,366,280 (10.55
%) bytes.

Keywords
sun.misc.Launcher$AppClassLoader @ 0x2aaab362b4f8
org.jboss.netty.channel.socket.nio.NioAcceptedSocketChannel

Upstream network tech.  Ltd.

Chris Cheung

focus on java,c programming language and linux core

On Tue, Jan 4, 2011 at 18:22, chris cheung <zz12847643 at gmail.com> wrote:

> haha,  how about your download?
> i'm sorry for forget to compress
> now http://121.101.216.141:8080/0104dump.tar.gz is available
> only 360m
>
>  Upstream network tech.  Ltd.
>
> Chris Cheung
>
> focus on java,c programming language and linux core
>
>
>
> On Tue, Jan 4, 2011 at 15:19, chris cheung <zz12847643 at gmail.com> wrote:
>
>> ok  thank you  ,  it is that jhat service  can help you?
>>
>>
>> Upstream network tech.  Ltd.
>>
>> Chris Cheung
>>
>> focus on java,c programming language and linux core
>>
>>
>>
>> On Tue, Jan 4, 2011 at 15:10, Trustin Lee [via Netty Forums and Mailing
>> Lists] <ml-node+5887812-1030514654-309534 at n2.nabble.com<ml-node%2B5887812-1030514654-309534 at n2.nabble.com>
>> > wrote:
>>
>>> It seems to take almost eternity to download the heap dump.  Let me get
>>> back to you once I finish downloading it and have a chance to analyze it.
>>>
>>>
>>> On 01/04/2011 02:10 PM, chris wrote:
>>>
>>> >
>>> > the problem about decoder i had resolved at last week , i found the
>>> core
>>> > problem was i config the decoder and handler as singleton,now it were
>>> not
>>> > singleton,  but the memory leak still exist.
>>> > i upload the jmap dump file at http://121.101.216.141:8080/0104dump
>>> >
>>> > and i startup the jhat service at http://121.101.216.141:11411
>>> >
>>> > if you can not access http://121.101.216.141:11411  please just wait
>>> for a
>>> > moment ,because the 0104dump size=2.7G, i'm startup jhat at  13:10
>>> >
>>> > i'm waiting for your reply online.
>>> >
>>> >
>>> >
>>> > Upstream network tech.  Ltd.
>>> >
>>> > Chris Cheung
>>> >
>>> > focus on java,c programming language and linux core
>>> >
>>> >
>>> >
>>> > On Tue, Jan 4, 2011 at 10:40, Trustin Lee [via Netty Forums and Mailing
>>>
>>> > Lists] <[hidden email]<http://user/SendEmail.jtp?type=node&node=5887812&i=0>
>>> <[hidden email] <http://user/SendEmail.jtp?type=node&node=5887812&i=1>>
>>> >> wrote:
>>> >
>>> >> Could you upload the heap dump somewhere?
>>> >>
>>> >> --
>>> >> Trustin Lee - http://gleamynode.net/
>>> >> Sent from a mobile device - please excuse the brevity.
>>> >>
>>> >> On Jan 3, 2011, at 2:06 PM, chris <[hidden email]<
>>> http://user/SendEmail.jtp?type=node&node=5887462&i=0>>
>>> >> wrote:
>>> >>
>>> >>>
>>> >>> i'm developing a webgame,when i was doing performance testing(based
>>> on 8k
>>> >>
>>> >>> online user)  for one day(about 15 hours),
>>> >>> i found  memory size jvm used was 4.8G ,i dump the memory by jmap,and
>>>
>>> >>> startup the jhat viewer,  the top 12 classes as follower:
>>> >>>
>>> >>> 307739 instances of class
>>> org.jboss.netty.channel.DownstreamMessageEvent
>>> >>> 297635 instances of class
>>> >>> org.jboss.netty.util.internal.LinkedTransferQueue$Node
>>> >>> 227420 instances of class
>>> >> org.jboss.netty.buffer.BigEndianHeapChannelBuffer
>>> >>> 159719 instances of class
>>> org.jboss.netty.channel.DefaultChannelFuture
>>> >>> 152708 instances of class
>>> >>>
>>> org.jboss.netty.channel.socket.nio.SocketSendBufferPool$PooledSendBuffer
>>> >>> 138592 instances of class
>>> >>> org.jboss.netty.channel.DefaultWriteCompletionEvent
>>> >>> 132096 instances of class
>>> org.jboss.netty.buffer.DuplicatedChannelBuffer
>>> >>> 120310 instances of class org.jboss.netty.buffer.DynamicChannelBuffer
>>>
>>> >>> 107109 instances of class
>>> org.jboss.netty.channel.UpstreamMessageEvent
>>> >>> 76816 instances of class
>>> >>> org.jboss.netty.util.internal.ConcurrentHashMap$Segment
>>> >>> 76816 instances of class
>>> >>> [Lorg.jboss.netty.util.internal.ConcurrentHashMap$HashEntry;
>>> >>> 65074 instances of class
>>> >>> org.jboss.netty.util.internal.ConcurrentHashMap$ValueIterator
>>> >>>
>>> >>> i can not get why the instance count of DownstreamMessageEvent and
>>> >>> UpstreamMessageEvent is so high?  can you  help me?
>>> >>> thanks all.
>>> >>> --
>>> >>> View this message in context:
>>> >>
>>> http://netty-forums-and-mailing-lists.685743.n2.nabble.com/memory-leak-a-problem-about-DownstreamMessageEvent-tp5880466p5880466.html<http://netty-forums-and-mailing-lists.685743.n2.nabble.com/memory-leak-a-problem-about-DownstreamMessageEvent-tp5880466p5880466.html?by-user=t&by-user=t>
>>> <
>>> http://netty-forums-and-mailing-lists.685743.n2.nabble.com/memory-leak-a-problem-about-DownstreamMessageEvent-tp5880466p5880466.html?by-user=t<http://netty-forums-and-mailing-lists.685743.n2.nabble.com/memory-leak-a-problem-about-DownstreamMessageEvent-tp5880466p5880466.html?by-user=t&by-user=t&by-user=t>>
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>>> >>
>>> >
>>> --
>>> Trustin Lee, http://gleamynode.net/
>>>
>>>
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