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Subject: [OMPI devel] warn when fork() used with openib btl?
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-06-23 09:42:14

Those who care about the openib BTL:

What do you think about warning when fork() is used with the openib
BTL? See for details.

Rationale: Several Cisco customers have been bitten by not realizing
that they had calls to system() in their MPI codes when switching away
from older mVAPI-based stacks to OFED (the older Cisco/Topspin mVAPI
stack was a bit more tolerable of fork()). Newer kernels and OFED
versions can handle fork() better, but I've still had spurious reports
of MPI codes failing when system() was used (never had much chance to
followup to see what was actually happening, though -- it *should*
have worked...?).

Jeff Squyres
Cisco Systems