'Read Multicast Msg Fragment'

I have two weblogic instances on the same Sun box. I run an XSL/XSLT transformation
on one instance, it takes 15 seconds. I run the exact same XSL/XSLT transformation
on the other instance, it takes 14 minutes. This is running the same job on both
instances at the same time. Both instances have available RAM and available threads
while this job is running.
One difference I see when comparing the default execute queues for these two weblogic
instances is that the one that seems to hang has a 'Read Multicast Msg Fragment'
request listed in the execute queue and the other does not. This appears to be
associated with this in a thread dump:
"ExecuteThread: '10' for queue: 'default'" daemon prio=5 tid=0x303248 nid=0x18
runnable [0xe2a81000..0xe2a819d8]
at java.net.PlainDatagramSocketImpl.receive(Native Method)
at java.net.DatagramSocket.receive(DatagramSocket.java:387)
at weblogic.cluster.FragmentSocket.receive(FragmentSocket.java:161)
at weblogic.cluster.MulticastManager.execute(MulticastManager.java:336)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:153)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:134)
What is this? Could it have something to do with my performance problem?
Any insight appreciated.
David Holk

Are two instances in a cluster. The thread you point out is receiving
multicast messages. heartbeats, jndi replication, and other internal
communication happens on multicast.
I doubt this is the problem.
Duing the 14min duration please take 3-4 threaddumps at 30 second interval
and attach it here. That should show whats happening in the server.
sree
"David Holk" <dholk@*remove*criticalresourcetech.com> wrote in message
news:40b4ca58$1@mktnews1...
>
I have two weblogic instances on the same Sun box. I run an XSL/XSLTtransformation
on one instance, it takes 15 seconds. I run the exact same XSL/XSLTtransformation
on the other instance, it takes 14 minutes. This is running the same jobon both
instances at the same time. Both instances have available RAM andavailable threads
while this job is running.
One difference I see when comparing the default execute queues for thesetwo weblogic
instances is that the one that seems to hang has a 'Read Multicast MsgFragment'
request listed in the execute queue and the other does not. This appearsto be
associated with this in a thread dump:
"ExecuteThread: '10' for queue: 'default'" daemon prio=5 tid=0x303248nid=0x18
runnable [0xe2a81000..0xe2a819d8]
at java.net.PlainDatagramSocketImpl.receive(Native Method)
at java.net.DatagramSocket.receive(DatagramSocket.java:387)
atweblogic.cluster.FragmentSocket.receive(FragmentSocket.java:161)
atweblogic.cluster.MulticastManager.execute(MulticastManager.java:336)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:153)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:134)
What is this? Could it have something to do with my performance problem?
Any insight appreciated.
David Holk

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