[MPI3-IO] Non blocking collective I/O ticket

[Mohamad Chaarawi]

I updated the draft and attached it to the ticket with Fab's comments, 
which included moving the entire split collective section to the 
deprecated chapter, and emphasizing more the progress rules.

I would like to get some feedback especially on the nonblocking 
Collective I/O section on page 484, which I updated to emphasize the 
progress rules which wasn't very clear in the first draft.

Right now it reads as:

\subsection{Nonblocking Collective File Operations}
%--------------------------------------
\label{sec:io-semantics-nb-collective}
Nonblocking collective file operations are subject to the same 
restrictions as
blocking collective I/O operations. All processes, belonging to the
communicator that was used to open the file, must call collective I/O
operations (blocking and nonblocking) in the same order. In particular, 
once a
process calls a collective I/O operation, all other processes, belonging to
the communicator used to open the file, must eventually call the same
collective I/O operation, and no other collective I/O operation on the same
file handle in between.

Nonblocking collective I/O operations do not match with blocking collective
I/O operations. Multiple nonblocking collective I/O operations can be
outstanding on a single file handle.  Quality MPI implementations should be
able to support a large number of pending nonblocking I/O operations.

All calls are local and return immediately, irrespective of the status of
other processes. The call initiates the operation which may progress
independently of any communication, computation, or I/O. The call returns a
request handle, which must be passed to a completion call. All input 
arguments
should not be modified, and all output buffers should not be accessed before
the completion call. The same progress rules described for nonblocking
collective operations apply for nonblocking collective I/O operations. For a
complete discussion, please refer to the semantics set forth in
Section~\ref{sec:nbcoll} on page~\pageref{sec:nbcoll}.


Thanks,
Mohamad

On 12/13/2011 04:49 PM, Mohamad Chaarawi wrote:
> Hi All,
>
> I think enough people have joined to post to this list now..
> Quincey will present ticket 273 (immediate non-blocking collective I/O 
> operations) for a first reading at the January meeting. I attached an 
> updated draft for IO chapter authors (or others) to review before 
> sending it out on the general mailing list.
> Last time there was an issue with deprecating the split collective 
> routines. Let me know if you have any comments.
>
> ticket url:
> https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/273
>
> Thanks,
> Mohamad
>
>
>
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