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Subject: Re: [OMPI users] openmpi-1.9a1r27674 on Cygwin-1.7.17
From: Ralph Castain (rhc_at_[hidden])
Date: 2012-12-18 10:32:20


Also, be aware that the Cygwin folks have already released a fully functional port of OMPI to that environment as a package. So if you want OMPI on Cygwin, you can just download and install the Cygwin package - no need to build it yourself.

On Dec 18, 2012, at 7:23 AM, Jeff Squyres <jsquyres_at_[hidden]> wrote:

> On Dec 18, 2012, at 10:06 AM, JR Cary wrote:
>
>> So, IMO, OpenMPI would have to turn to a different
>> group for support. E.g., Microsoft compatible HPC
>> application vendors. And for that one would need a
>> compelling case of being better in, e.g., performance.
>
> I doubt that a performance case could be made. That is, I don't expect modern versions of Windows are any more/less efficient and integer/floating point ops (which are key to HPC apps) than modern versions of Linux or other OS's. The underlying x86 hardware is the same (in most/commodity cases), after all.
>
> Windows also has (effectively) an OS-bypass network stack, like Linux, for network providers.
>
> Hence, I don't want to open the "Windows performance vs. Linux performance" religious debate. I'm assuming that if someone cared, they could get comparable performance out of Windows and Linux.
>
>> Perhaps there is another way?
>
>
> At this point, I think we're up for volunteers. :-\
>
> FWIW: I'm still debating these cygwin patches.
>
> The cmake/native build process will likely go if no one steps up to maintain it. But in our discussions, I don't think we've delineated between "Windows native" and "cygwin": a major difference is that he cygwin build uses the same Autotools build system that OMPI uses on POSIX systems. And I don't know how much custom code cygwin requires vs. native Windows code (although I seem to recall that native windows code definitely performs better than its cygwin counterparts -- e.g., Windows SOCKETs are faster then cygwin POSIX sockets).
>
> --
> 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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