Open MPI currently does not fully support a proper disconnection of
parent and child processes. Thus, if a child dies/aborts, the parents
will abort as well, despite of calling MPI_Comm_disconnect. (The new RTE
will have better support for these operations, Ralph/Jeff can probably
give a better estimate when this will be available.)
However, what should not happen is, that if the child calls MPI_Finalize
(so not a violent death but a proper shutdown), the parent goes down at
the same time. Let me check that as well...
Brignone, Sergio wrote:
Hi everybody,
I am trying to run a master/slave set.
Because of the nature of the problem I need to start and stop (kill)
some slaves.
The problem is that as soon as one of the slave dies, the master dies also.
This is what I am doing:
MASTER:
MPI_Init(...)
MPI_Comm_spawn(slave1,...,nslave1,...,intercomm1);
MPI_Barrier(intercomm1);
MPI_Comm_disconnect(&intercomm1);
MPI_Comm_spawn(slave2,...,nslave2,...,intercomm2);
MPI_Barrier(intercomm2);
MPI_Comm_disconnect(&intercomm2);
MPI_Finalize();
SLAVE:
MPI_Init(...)
MPI_Comm_get_parent(&intercomm);
(does something)
MPI_Barrier(intercomm);
MPI_Comm_disconnect(&intercomm);
MPI_Finalize();
The issue is that as soon as the first set of slaves calls MPI_Finalize,
the master dies also (it dies right after MPI_Comm_disconnect(&intercomm1) )
What am I doing wrong?
Thanks
Sergio
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