[Mpi-forum] MPI user survey

[Jeff Squyres]

This question is not well differentiated from Dick's question, IMHO --  
I don't think a user will be able to tell the difference.

Unless it can be clearly distinguished from Dick's question, I think  
we should only include one of them.


On Nov 17, 2009, at 2:57 PM, Supalov, Alexander wrote:

> Thanks. Good idea. A first take on the subsetting follows:
>
> The MPI-3 standard is going to provide several substantial  
> extensions to the existing MPI standard. Some of them may or may not  
> be needed for all MPI-3 applications. At the same time, runtime  
> support for the complete set of the MPI-3 features may incur  
> additional implementation complexity and hence probably performance  
> and/or memory space penalty on the rest of the MPI implementation  
> (think dynamic processes in the case of MPI-2, for one). Subsetting,  
> i.e., a facility intended to determine a working subset of the MPI  
> features needed for a particular application, was proposed as one  
> way of managing the increasing complexity of the MPI standard on a  
> per application basis. If such a facility were included into the  
> MPI-3 standard, how useful might that be to you?
>
> Very valuable
> Probably valuable
> Probably useless
> Useless
> Harmful
>
> From: mpi-forum-bounces at lists.mpi-forum.org [mailto:mpi-forum-bounces at lists.mpi-forum.org 
> ] On Behalf Of Richard Treumann
> Sent: Tuesday, November 17, 2009 6:48 PM
> To: Main MPI Forum mailing list
> Subject: Re: [Mpi-forum] MPI user survey
>
> I will leave it to Alexander to for a question about subsetting if  
> he wishes to. Here is one about assertions.
>
> The MPI standard provides certain semantic guarantees that may not  
> be required by a
> particular application. It also provides functions that many  
> applications never use. If MPI-3
> provided an "assertions" interface that would let an application  
> identify specific
> functionality it does not depend on and an MPI library could improve  
> performance or reduce
> memory usage by disabling that specific functionality, how valuable  
> might that interface be?
>
> Very valuable
> Probably valuable
> Probably useless
> useless
> harmful
>
>
> Dick Treumann - MPI Team
> IBM Systems & Technology Group
> Dept X2ZA / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601
> Tele (845) 433-7846 Fax (845) 433-8363
>
>
> mpi-forum-bounces at lists.mpi-forum.org wrote on 11/17/2009 11:40:03 AM:
>
> > [image removed]
> >
> > Re: [Mpi-forum] MPI user survey
> >
> > Jeff Squyres
> >
> > to:
> >
> > Main MPI Forum mailing list
> >
> > 11/17/2009 11:41 AM
> >
> > Sent by:
> >
> > mpi-forum-bounces at lists.mpi-forum.org
> >
> > Please respond to Main MPI Forum mailing list
> >
> > On Nov 17, 2009, at 8:16 AM, Supalov, Alexander wrote:
> >
> > > No objections - let's go for 2 separate questions, e.g.:
> > >
> > > "Do you want to achieve higher performance by disabling certain
> > > MPI-3 features in your program?
> >
> > I do not think that this is a well-formed question.
> >
> > It directly states something that has not been well defined (or even
> > accepted) by the Forum.  Specifically: it is *by no means  
> guaranteed*
> > that you will get higher performance by disabling certain MPI-3
> > features.  Heck, we don't even know precisely what MPI-3 features  
> will
> > exist!
> >
> > > "If so, do you prefer subsetting or assertions?"
> >
> > The others questions contain at least a hint of context so that
> > respondents have a clue as to how to answer.  This one explains
> > neither "subsetting" nor "assertions".  I suspect that 95% of
> > respondents will not know how to answer.
> >
> > --
> > Jeff Squyres
> > jsquyres at cisco.com
> >
> > _______________________________________________
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> > mpi-forum at lists.mpi-forum.org
> > http://lists.mpi-forum.org/mailman/listinfo.cgi/mpi-forum
>
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-- 
Jeff Squyres
jsquyres at cisco.com