We talked during the telecon about the user-reported issue where they asked for
knem support, it wasn’t available on the system, but we ran anyway at a reduced
performance level. The agreement we had was that OMPI should instead fail at
that point since the user had requested something we could not do. I got tasked
with implementing this.
Here is the problem code:
/* If "use_knem" is positive, then it's an error if knem support
is not available -- deactivate the sm btl. */
if (mca_btl_sm_component.use_knem > 0) {
opal_show_help("help-mpi-btl-sm.txt",
"knem requested but not available",
true, opal_process_info.nodename);
return NULL;
As you can see, we deactivate sm but do not necessarily fail. Question for you
folks: how do I cause us to safely fail from within a BTL??
Thanks
Ralph
