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Subject: Re: [OMPI devel] heterogeneous support
From: Brian W. Barrett (brbarret_at_[hidden])
Date: 2008-06-05 16:53:05

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.