This will benefit to several components: BTL/PTL, PML, having a common
set of functions will be really useful. I just have a request. If we
specify something like "--mca btl self,mvapi" I think it can be useful
to get them in the specified order. For some components (like the BTL)
it doesn't make any difference as we will use their internal priorities
to order them.For others we can use the order as an indication of the
user kind priority.
Thanks,
george.
Jeff Squyres wrote:
Short version:
--------------
I'd like to have a single, top-level MCA param for each framework that
controls the "include" and "exclude" behavior of components. Something
like:
mpirun --mca btl self,mvapi ...
would "include" self, mvapi (this actually already works for dynamic
compiles). And:
mpirun --mca btl !tcp
would "exclude" tcp. This would be for all frameworks, at the
mca_base_components_open() level, not during framework-specific
selection. Hence, excluded / not-included components wouldn't even be
opened (i.e., faster startup and smaller memory footprint).
Longer version:
---------------
Long, long ago, before Tim knew that I put in the <framework> MCA
params into mca_base_components_open(), he added btl_base_include and
btl_base_exclude to handle this kind of thing. I think that this
should be handled at the MCA level itself -- there should be no need to
have this kind of exclusion and inclusion at each framework.
More specifically, the frameworks can call mca_base_components_open()
just as they do now, and if the MCA parameter for that framework was
specified, mca_base_components_open() will obey it and pass back a
customized list of components back to the caller. The
btl_base_[include|exclude] parameters (and others similar to it) can
then be removed.
Given that I already am on the hook to fix the static compile issue for
1.0, adding this functionality would be pretty trivial. Therefore, I'd
like to do it for 1.0. It would also give us a nice, uniform way of
including components across all frameworks.
It's also shorter to type on the command line. :-)
Comments?
