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Subject: Re: [OMPI users] Pros and cons of --enable-heterogeneous
From: Ralph Castain (rhc_at_[hidden])
Date: 2010-10-07 17:17:14

Hetero operations tend to lose a little performance due to the need to
convert data, but otherwise there is no real negative. We don't do it by
default solely because the majority of installations don't need to, and
there is no reason to lose even a little performance if it isn't necessary.

If you want an application to be able to span that mix, then you'll need to
set that configure flag.

On Thu, Oct 7, 2010 at 1:44 PM, David Ronis <David.Ronis_at_[hidden]> wrote:

> I have various boxes that run openmpi and I can't seem to use all of
> them at once because they have different CPU's (e.g., pentiums, athlons
> (both 32 bit) vs Intel I7 (64 bit)). I'm about the build 1.4.3 and was
> wondering if I should add --enable-heterogenous to the configure flags.
> Any advice as to why or why not would be appreciated.
> David
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