I'm working on a collective component and need point-to-point
communication during module-initialization.
As BTL is initialized prior to the collectives, I tried to use send and
recv like MPI_Send/_Recv do:
err = MCA_PML_CALL(send(buf, size, MPI_CHAR, to_id,
COLL_SCI_TAG, MCA_PML_BASE_SEND_STANDARD, comm));
This works for a total of 32 Bytes (8 times 4 Bytes) to each receiver.
If I increase the number of processes, recv just doesn't return after 8
recv-calls. (Further, this communication is extremely slow.)
When I try to use MPI_Send/_Recv themselves, an error "MPI not yet
Long story short: is there a way to communicate during
mca_coll_*_module_init between different processes?
(I don't want to use TCP/IP-sockets while Open MPI should be able to do
this more portable.)
Thanks for your help,