I am building ompi v1.6 with knem support and I see that when knem is
enabed from the command line
it is used for all message sizes in SM btl. There is no threshold for when
to start using knem - starting
which message size.
This makes the performance of small messages worse since it also uses knem.
Maybe a certain "knem threshold" should be added to specify when to use SM
btl's send and when to start using knem.
What do you think?