On Feb 23, 2009, at 10:37 AM, Eugene Loh wrote:
> I sense an opening here and rush in for the kill...
> And, why does the PML pass a BTL argument into the sendi function?
> First, the BTL argument is not typically used. Second, if the BTL
> sendi function wants to know what BTL it is,... uh, doesn't it
> already know??? Doesn't a BTL know who it is? Why, then, should
> the PML have to tell it?
I suspect that it's passing in the BTL *module* argument, which may
have specific information about the connection that is to be used.
Example: if I have a dual-port IB HCA, Open MPI will make 2 different
openib BTL modules. In this case, the openib BTL will need to know
exactly which module the PML is trying to sendi on.