[OMPI devel] why does --rankfile need hostlist?

[Eugene Loh]

In order to use "mpirun --rankfile", I also need to specify 
hosts/hostlist.  But that information is redundant with what I provide 
in the rankfile.  So, from a user's point of view, this strikes me as 
broken.  Yes?  Should I file a ticket, or am I missing something here 
about this functionality?