[Beowulf] The Case for an MPI ABI
lindahl at pathscale.com
Wed Feb 23 15:04:41 EST 2005
On Wed, Feb 23, 2005 at 12:19:55PM +0100, Joachim Worringen wrote:
> Unfortunately, the value of an ABI is much reduced by the fact that the
> most important target platform Linux itself has no stable ABI (think of
> libc and other version nightmares). On a OS like Solaris or Windows,
> this is much more of a benefit.
I don't think it's "much reduced" by this, but I think it's clear this
would be a matter of opinion. What you'll definitely be able to do is
run an application built on a particular Linux version with different
MPI libraries compiled for that same Linux version. You are correct
that if the MPI library was built for a wildly different Linux distro
than the app, you can't necessarily put them together.
> Another problem are i.e. vendor-specific assertions that could conflict.
> A solution for this could be "numerical namespaces" for such extensions,
> but how should they be managed?
This is certainly something that a committe would discuss. There are
plenty of examples of this problem being solved successfully by
handing out numeric ranges.
> And what about the different calling-conventions in Fortran?
The calling conventions differences (in Linux) revolve around the
f2c-abi issue, and it so happens that no MPI routines trip on this
issue, as it only affects functions that return REAL*4 or COMPLEX
types. Did I miss a function that has those return types?
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