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Subject: Re: [OMPI devel] heterogeneous support
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2008-06-05 16:56:17


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