More on Weblogic Muxers
This is a follow-up to an earlier article which detailed the Weblogic Socket Muxer pattern in thread dumps.
Another ERROR pattern associated with Muxers is shown below
As written in an earlier post, each incoming request on a TCP socket uses one File Descriptor.
We monitored the File Descriptors available to this Weblogic server using
The first command shows that 1024 FDs are allocated to this process, and the second shows how many are being used in real-time.
A plot of the second value during high load times shows the FDs go up to 900+ in use and hence a resolution used in this case is to increase the number of FDs.
A recommended value is to increase it to 8192.
Another ERROR pattern associated with Muxers is shown below
####<Jun 23, 2009 9:25:24 AM BST> <Error> <Socket> <d001> <managed1> <ExecuteThread: '0' for queue: 'weblogic.socket.Muxer'> <<WLS Kernel>>
<BEA-000403> <IOException occurred on socket: Socket[addr=/10.23.22.1,port=1950,localport=61002]
java.net.SocketException: Connection refused.
java.net.SocketException: Connection refused
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at weblogic.socket.SocketMuxer.readReadySocketOnce(SocketMuxer.java:672)
at weblogic.socket.SocketMuxer.readReadySocket(SocketMuxer.java:648)
at weblogic.socket.PosixSocketMuxer.processSockets(PosixSocketMuxer.java:123)
at weblogic.socket.SocketReaderRequest.execute(SocketReaderRequest.java:32)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
As written in an earlier post, each incoming request on a TCP socket uses one File Descriptor.
We monitored the File Descriptors available to this Weblogic server using
Here the Weblogic pid = 8359
/usr/proc/bin/pfiles 8359 | grep rlimit
1024
ls /proc/8359/fd | wc –l
140
The first command shows that 1024 FDs are allocated to this process, and the second shows how many are being used in real-time.
A plot of the second value during high load times shows the FDs go up to 900+ in use and hence a resolution used in this case is to increase the number of FDs.
A recommended value is to increase it to 8192.
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