I wonder if it would be useful to have an OMPI-specific extension for
this kind of functionality, perhaps OMPI_Was_launched_by_mpirun() (or
something with a better name, etc.)...?
This would be a pretty easy function for us to provide (right
Ralph?). My question is -- would this (and perhaps other similar
extensions) be useful to the community at large?
On Oct 21, 2008, at 5:46 PM, Adams, Brian M wrote:
I'm not sure I understand the problem. The ale3d program from
LLNL operates exactly as you describe and it can be built
with mpich, lam, or openmpi.
Hi Doug,
I'm not sure what reply would be most helpful, so here's an attempt.
It sounds like we're on the same page with regard to the desired
behavior. Historically, we've been able to detect serial vs.
parallel launch of the binary foo, with a whole host of
implementations, including those you mention, as well as some vendor-
specific implementations (possibly including DEC/OSF, SGI, Sun, and
AIX/poe, though I don't know all the details). We typically
distinguish serial from parallel executions on the basis of
environment variables set only in the MPI runtime environment. I
was just trying to ascertain what variable would be best to test for
in an OpenMPI environment, and I think Ralph helped with that.
If the ale3d code takes a different approach, I'd love to hear about
it, off-list if necessary.
Brian
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Jeff Squyres
Cisco Systems
