Good call -- I just checked ompi/proc/proc.c and we *do* check. If
you start a heterogeneous job and we don't have support for it, we
show_help and barf.
I'll change the default tonight.
On Jun 5, 2008, at 4:53 PM, Brian W. Barrett wrote:
On Thu, 5 Jun 2008, Jeff Squyres wrote:
I just noticed that heterogeneous MPI support is enabled by default.
Do we really want this? Doesn't it add a little overhead (probably
noticeable on shared memory)?
I'd be comfortable with users specifically having to enable
heterogeneous support via configure and having [slightly] better out-
of-the-box performance for the common (homogeneous) case.
I think it was initially on by default because we didn't have a good
way
of detecting that the job was heterogeneous when that was setup. I
believe we do now, so it probably makes sense to change the default.
Brian
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Jeff Squyres
Cisco Systems
