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Subject: Re: [OMPI devel] RFC: Remove heterogeneous support
From: Atchley, Scott (atchleyes_at_[hidden])
Date: 2014-04-28 10:09:44


Hi George,

The Power8 can run in little-endian mode without penalty:

http://www.hpcwire.com/2014/04/23/power8-openpower-might-mean-hpc/

Not saying hetero support is unneeded, but this case may not be it.

Scott

On Apr 24, 2014, at 12:54 PM, George Bosilca <bosilca_at_[hidden]> wrote:

> There seems to be an opportunity to still have heterogeneous environment in the future.
> http://www.enterprisetech.com/2014/04/23/ibm-google-show-power8-systems-openpower-efforts/
>
> I don’t think it is fair to shift the burden on the original developer instead of the committer who broke a feature.
>
> George.
>
> On Apr 23, 2014, at 09:49 , Jeff Squyres (jsquyres) <jsquyres_at_[hidden]> wrote:
>
>> WHAT: Remove data-heterogeneous support from Open MPI
>>
>> WHY: No one uses it (it's not the default), it's broken (probably has been for a while)
>>
>> WHERE: Datatype engine, some configury, and a few other places
>>
>> TIMEOUT: Tuesday teleconf, 6 May 2014 (i.e., 2 weeks from now)
>>
>> MORE DETAIL:
>>
>> It recently came to my attention that we seem to have some bit rot in the heterogeneous data representation support such that if you configure with --enable-heterogeneous, even if you run on homogeneous machines, you can get segv's with tcp,sm,self.
>>
>> The heterogeneous support has never been enabled by default. AFAIK, only Cisco tests it regularly in its MTT. I'm be greatly surprised if many (any?) users use it at all.
>>
>> So I have to ask myself: why do we keep this functionality around? It seems like we should delete this code, simplify things a little, and move on.
>>
>> Comments?
>>
>> --
>> Jeff Squyres
>> jsquyres_at_[hidden]
>> For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/
>>
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