[OMPI devel] sm BTL "extra procs"

[Eugene Loh]

Why does the sm BTL allocate "extra procs"?
E.g.,

https://svn.open-mpi.org/trac/ompi/browser/branches/v1.3/ompi/mca/btl/sm/btl_sm.c?version=19785#L403

In particular:

*) sm_max_procs is -1 (so there is no max)
*) sm_sm_extra_procs (sic, this is the ompi_info name) is 2

So, if there are n procs on the node, it allocates FIFOs for n*(n+2) 
connections.  Why?