/etc/mpj/mpjexpress.conf is in libmpj-java 0.44+dfsg-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# MPJ Express Ports Configurations #
#********************************************************************
#Server port number for the daemon.
mpjexpress.mpjdaemon.port.1=40055
#Server port number for port manager.
#Redundant in case of YARN
mpjexpress.mpjdaemon.port.2=40052
#Server port for MPJRun.java server.
#Used to collect individual port information and then port info
#distribution to all processes.
mpjexpress.mpjrun.port.1=40002
#********************************************************************
# MPJ Express Logging Properties
#********************************************************************
# Log Level for Daemon log file output. (OFF or DEBUG log level currently supported)
# (See docs for log levels.)
mpjexpress.mpjdaemon.loglevel=OFF
# Log Level for MPJRun log file output. (OFF or DEBUG log level)
mpjexpress.mpjrun.loglevel=OFF
# Log Level for MPI log file output. (OFF or DEBUG log level)
mpjexpress.mpi.loglevel=OFF
#********************************************************************
# MPJ Express Version
#********************************************************************
mpjexpress.version=0.44
#********************************************************************
# MPJ Express Collectives Check
#********************************************************************
#Set true to use Flat Tree Collective Primitives
mpjexpress.mpi.old.collectives=false
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