increasing memory usage

[Cuper Hector]

OOT question, may I ask which tool did you use to analyze the heap dump?

On Wed, Jan 27, 2010 at 10:12 PM, "Trustin Lee (이희승)" <trustin at gmail.com>wrote:

> According to the heap dump, a lot of buffers are stuck in the event
> queue of a NioClientSocketChannel.  The channel's interestOps is 5
> (OP_READ + OP_WRITE), which means the channel's socket send buffer is
> full.  Because your write request cannot be completed due to the full
> socket buffer, it will be kept in the event queue and eventually cause
> OOME.
>
> Why is the socket buffer full?  It's perhaps because the server is not
> reading the data you are sending at all.  You have to disconnect or stop
> sending data in such a case.
>
> Generally, such a problematic server does not send a response message
> for the message you've sent.  You could maintain an integer variable
> that counts the number of unanswered requests and disconnect if the
> counter becomes greater than a certain threshold.  In a normal
> connection, the counter will be increased and then decreased because the
> responses will be received fairly quickly.
>
> Just in case you think the server is just fine and something's wrong
> with Netty, provide me the full source code of the client-server pair
> that reproduces the problem.
>
> HTH,
> Trustin
>
> Mahmood Rahmani wrote:
> > sorry, i meant -Xmx16m
> >
> >
> > On Jan 27, 2010, at 2:13 PM,  wrote:
> >
> >> here is the heap dump for -Xmx96m:
> >> http://tinyurl.com/yeggxb7
> >>
> >>
> >>
> >> On Jan 27, 2010, at 12:53 PM, Trustin Lee (이희승) wrote:
> >>
> >>> Oh, that's too bad.  Then could you post the heap dump file?  You can
> >>> configure your VM to generate heap dump on OutOfMemoryError:
> >>>
> >>>    -XX:+HeapDumpOnOutOfMemoryError
> >>>
> >>> For more information on generating heap dump, read this article:
> >>>
> >>>    http://blogs.sun.com/alanb/entry/heap_dumps_are_back_with
> >>>
> >>> I would still recommend to decrease the max heap size so that you can
> >>> get OOME sooner so that heap dump is generated sooner.
> >>>
> >>> cyrus77 wrote:
> >>>> Hi,
> >>>>
> >>>> Thanks for your reply,
> >>>>
> >>>> Unfortunately yes, I get OutOfMemoryError.
> >>>> How can we investigate it? any idea?
> >>>>
> >>>> Thanks,
> >>>> Cyrus
> >>>>
> >>>>
> >>>> On Jan 27, 2010, at 11:31 AM, Trustin Lee [via Netty Forums and
> Mailing Lists] wrote:
> >>>>
> >>>>> If you do not get an OutOfMemoryError, it is safe to decrease the
> >>>>> maximum heap size of the VM with -Xmx option.  I'd cut down to 96MB
> >>>>> (i.e. -Xmx96m).
> >>>>>
> >>>>> If you get an OutOfMemoryError eventually, that's more like a memory
> >>>>> leak that needs more investigation.
> >>>>>
> >>>>> cyrus77 wrote:
> >>>>>
> >>>>>> Hi,
> >>>>>>
> >>>>>> I am using Netty to develop a simple TCP client and connect to a
> server to
> >>>>>> receive data 24x7. The data being transferred is not much, its
> around 100KB
> >>>>>> to 200KB per minute.
> >>>>>>
> >>>>>> The problem is that the client starts allocating memory gradually
> and after
> >>>>>> some hours or a day (depending on how much data is being sent by the
> server
> >>>>>> to this client) the allocated heap memory reaches up to 500 MB!
> >>>>>>
> >>>>>> The thing is that even if I do nothing with the message (do nothing
> in
> >>>>>> messageReceived method) the problem still exist!
> >>>>>>
> >>>>>> I attached the code if you would like to take a look.
> >>>>>> http://n2.nabble.com/file/n4466226/code.java code.java
> >>>>>>
> >>>>>> Do you have any idea what is wrong with it?
> >>>>>>
> >>>>>> Thanks,
> >>>>>> Cyrus
> >>>>>>
> >>>>> --
> >>>>> what we call human nature in actuality is human habit
> >>>>> http://gleamynode.net/
> >>>>>
> >>>>>
> >>>>>
> >>>>>
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> >>>>>
> >>>>>
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> >>>>>
> >>>>
> >>> --
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> >>>
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