Java method trace

You can use the method trace to trace the NIO (network I/O) code within the Java™ Virtual Machine (JVM). Add the following parameters to the JVM:

-Xtrace:methods={java/nio/channels/SocketChannel.*},output=/var/zexpl/logs/nio.trc

This will produce a binary file nio.trc, which needs to be formatted using the following command:

java com.ibm.jvm.format.TraceFormat 
   /var/zexpl/logs/nio.trc /var/zexpl/logs/nio_trace.txt

The tracing suggested will trace only the SocketChannel class. If you want to trace the entire network I/O code, you need to limit the tracing to java/nio/* in the Xtrace command.

Note: Xtrace greatly reduces the performance.