p4tcp — configure the ParaStation4 TCP bypass.
p4tcp [ -v ] [ -a ] [ -d ] [ -? ] [ from [
to ]]
p4tcp configures the ParaStation4 TCP bypass. Without an argument, the current configuration is printed.
From and
to are IP addresses forming an
address range for which the bypass feature should be activated.
Multiple addresses or address ranges may be configured by using
multiple p4tcp commands.
To enable the bypass for a pair of processes, the library
libp4tcp.so located in the directory
/opt/parastation/lib64 must be preloaded by
both processes using:
export LD_PRELOAD=/opt/parastation/lib64/libp4tcp.so
For parallel and serial tasks launched by ParaStation MPI, this environment variable is exported to all processes by default. Please refer to ps_environment(5).
-a,
--add
Add an address or an address range to the list of
redirected addresses. New TCP connections directed to a
node within this address range may use the
p4sock
protocol for data transfer.
-d,
--delete
Delete an address or address range from the list of
redirected addresses. New TCP connections to this
address(es) will no longer use the
p4sock protocol.
-v,
--version
Output version information and exit.
-?,
--help
Show a help message.
--usage
Display a brief usage message.