Hi,
MINA 1.1.7 ?
Gerrit Grobbelaar wrote:
YourKit shows the Class list as follows:
- java.nio.HeapByteBuffer
- org.apache.mina.common.SimpleByteBufferAllocator$SimpleByteBuffer
- org.apache.mina.filter.codec.ProtocolCodecFilter$HiddenByteBuffer
- org.apache.mina.common.IoFilter$WriteRequest
- java.util.concurrent.ConcurrentLinkedQueue$Node
Note the above contributes 99%+ for the byte[] allocations, and the byte[]
allocations are causing the OOM.
-----Original Message-----
From: Gerrit Grobbelaar <[EMAIL PROTECTED]>
Sent: Saturday 26 July 2008 09:48
To: [email protected]
CC:
Subject: Re: byte[] usage - not GCd
Another symptom:
- 100 Java client bots connected, sending NO messages.
- 1 Flash client, typing in a message every 2 seconds
- memory consumption (byte[] allocations) increases and a Mark Sweep with
JConsole doesn't do anything (stays on 100s of MBs).
- kill off all bots
- Mark sweep
- Heap mem usage drops to about 2 - 5MB
-----Original Message-----
From: Gerrit Grobbelaar <[EMAIL PROTECTED]>
Sent: Saturday 26 July 2008 09:33
To: [email protected]
CC:
Subject: byte[] usage - not GCd
Hi,
I'm having an issue with OOM - here is my story:
Criteria:
--------
- concurrent clients connecting to a chatserver, need to broadcast the
messages
- clients keep same connection (each one having its own IoSession during
lifetime)
Symptoms:
--------
- massive amounts of byte[] allocations that just grows and grows, until
OOM. - still OOM even if i have 100 bots connected, sending one message
each every 5 minutes
When I have 1 - 5 clients connected (all simulated with bots) that send
one message per bot every 2 - 5 seconds, heap space stays under control
with GC.
Configs/Tools:
-------------
- JVM: 1.6u7
- VM arguments: -Xms128m -Xmx384m
- Operating System: Linux 2.6.15.7
- Architecture: i386
- Number of processors: 2
- Model: Intel(R) Pentium(R) 4 CPU 2.80GHz
- Committed virtual memory: 681,564 kbytes
- Heap buffer allocation (Direct is very insufficient)
- SimpleByteBufferAllocator (do note I have same result with
PooledByteBufferAllocator)
- YourKit and JProfiler
Both YourKit and JProfiler point fingers at:
byte[] allocation due to org.apache.mina.common.IoSession.write() calls
What could I possibly be doing wrong that I will have the above scenario
where the byte[] allocations never GC properly?
Thanks,
Gerrit
--
--
cordialement, regards,
Emmanuel Lécharny
www.iktek.com
directory.apache.org
