Ports Used by the MPJ Express Software

There are three kinds of ports used by the MPJ Express software.

1. Daemons Ports (where MPJ Express daemons listen on compute-nodes). The value of this can be changed in two steps:

• Edit $MPJ_HOME/conf/wrapper.conf and search for property "wrapper.app.parameter.2=10000". Change it to whatever you want- lets call it X.
• Now you start your parallel application, use -dport switch to specify X. Some thing like this - mpjrun.sh ... -dport X ..
  

1. There are also ports used by MPJ Express runtime on the head-node. This is used to ship across the code. The default value of this is 15000. It can be changed by using the switch -sport Y - where `Y' is the port that you choose.
2. Each MPJ Express process uses a port for communication with peers. This can be changed by using -mpjport Z switch to mpjrun.sh - the default value is 20000.