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
