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Subject: Re: [OMPI users] Help: OpenMPI Compilation in Raspberry Pi
From: Lee Eric (openlinuxsource_at_[hidden])
Date: 2013-01-19 09:08:47


Any heads up? Thanks.

On Fri, Jan 18, 2013 at 5:28 AM, Jeff Squyres (jsquyres)
<jsquyres_at_[hidden]> wrote:
> On Jan 16, 2013, at 6:41 AM, Leif Lindholm <Leif.Lindholm_at_[hidden]> wrote:
>
>> That isn't, technically speaking, correct for the Raspberry Pi - but it is a workaround if you know you will never actually use the asm implementations of the atomics, but only the inline C ones..
>>
>> This sort of hides the problem that the dedicated barrier instructions were not available in ARMv6 (it used "system control coprocessor operations" instead.
>>
>> If you ever executed the asm implementation, you would trigger an undefined instruction exception on the Pi.
>
> Hah; sweet. Ok.
>
> So what's the right answer? Would it be acceptable to use a no-op for this operation on such architectures?
>
> --
> 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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