[Mpi3-ft] one sided

[Josh Hursey]

Let's be sure to talk about this on today's call. I have some other
one-sided notes that I would like to go over as well.

It would be fairly easy to support both modes since the MPI_Win_create
operation takes an info argument. We could define a key (similar to
what they have done for other operations) that either loosens or
tightens the semantics depending on what the default behavior should
be.

I think it is ok to have a non-synchronizing option, just as long as
we have clear semantics for when the window is not created at all
processes due to some process failure - or if the window is always
created regardless of emerging failure then we might avoid this issue,
but that might require some additional clarification.

Thanks,
Josh

On Wed, Oct 19, 2011 at 4:11 AM, Supalov, Alexander
<alexander.supalov at intel.com> wrote:
> Thanks. Why not having two calls or modes of operation to cover both?
>
> -----Original Message-----
> From: mpi3-ft-bounces at lists.mpi-forum.org [mailto:mpi3-ft-bounces at lists.mpi-forum.org] On Behalf Of Darius Buntinas
> Sent: Tuesday, October 18, 2011 9:57 PM
> To: MPI 3.0 Fault Tolerance and Dynamic Process Control working Group
> Subject: [Mpi3-ft] one sided
>
>
> I got some feedback from Jim and Pavan on the one-sided section.  One thing Jim pointed out was that we don't want to make window creation synchronizing, and the fail-or-succeed everywhere requirement would do that.
>
> If we say that window creation should not fail due to failed processes, that would accomplish the same thing:  If a window is created by a correct program, then it will succeed at all live processes.  Note that if an incorrect program specifies invalid parameters then the window creation may fail at some processes and succeed at others, but this is what we already have today.
>
> However, it's possible that some implementations cannot satisfy this requirement because, e.g., they do collectives as part of the operation.  So maybe we should have two options:
>
>  Either:
>    window creation won't fail because if failed processes
>  or
>    window creation will either succeed or fail everywhere and if window creation fails at
>    any process it fails at every process
>
> -d
>
>
>
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-- 
Joshua Hursey
Postdoctoral Research Associate
Oak Ridge National Laboratory
http://users.nccs.gov/~jjhursey