Short answer because we're all still in Chicago...
Terry tells me that you're just hacking around trying to see what
works, etc. So adding direct calls to the BTL in this kind of
scenario is ok. I'm sure you're aware that this is not good for real
code. :-)
To directly call a BTL function, you might just want to configure OMPI
with --enable-static; this will suck in all the plugins into libmpi,
and therefore all symbols are directly available at link time.
There's other, more elegant ways for this hackaround, but if you're
just playing/testing, this is probably good enough.
On Oct 22, 2008, at 1:04 PM, Eugene Loh wrote:
I'm trying to prototype an idea inside OMPI and am running into a
problem.
I want to add a new function to a BTL and to have the PML call this
function. I can't just put such a function call into the PML (not
even for my prototype) since the PML is loaded before the BTL and so
the PML will complain about a missing symbol.
So, the PML will just have to refer to the function symbolically and
I need to figure out the BTL function address "at the appropriate
time" (after the BTL is loaded but before I need to call my function).
I tried to dlopen the BTL (seemed successful... I got back a non-
NULL handle), but dlsym can't seem to find any of the symbols in the
BTL (not even ones that existed before I started any of my work).
I can describe other things I tried or other things I think are
supposed to work (but that I am reluctant to try), but let's cut to
the chase: HELP!
Please note that I'm a newbie OMPI developer and so I'm really
interested in doing the simplest thing possible to try my
prototype. I recognize that certain things will have to be done to
add "real code" back to the code base, but at this point I'd prefer
to defer difficult work and just test the ideas of my prototype.
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Jeff Squyres
Cisco Systems
