[mpich-discuss] Joining a job from a process without mpiexec parent

[Dmitriy Lyubimov]

Hi,

Is it possible from context of a task (not launched with mpiexec), but
having loaded libmpi.so, to join a job or mpi group, perhaps with either
comm_connect/accept or PMI routines such as here
https://wiki.mpich.org/mpich/index.php/PMI_v2_API using job id?

I guess in this case the process will be a "singleton", using the
terminlogy from the document above.

we can assume information about singleton job ids and/or ports can be made
available to every process willing to do such join, as well as whatever
other information needed to form a communicator (world or group).

I have implemented a hierarchical join of processes using
MPI_CONNECT/accept started as singletons with mpiexec but i had to fork the
task to execute mpiexec. If i could avoid forking and instead join the
parent process directly, that would be a great benefit in my context.

I think i already asked a similar question a couple of years ago, at that
time I did not get a better solution. Perhaps there's some new insight on
this.

Thanks in advance !
-Dmitriy
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