[Mpi3-subsetting] MPI subsetting: charting the way forward at atelecon next week?

[Supalov, Alexander]

Dear Dick,
 
A couple of suggestions re your proposal:
 
- If ASSERTIONS is put at the end of the MPI_INIT_ASSERTED argument
list, in C++ one can declare the last argument as having a zero default
value, and skip it if necessary. This might help with deprecation of the
earlier MPI_INIT_* calls.
- In non-Cray parts of the world, an MPI_INT followed by MPI_FLOAT is
likely to be a 4-byte int followed by a 4-byte float. This sometimes
depends on the compiler settings in effect, too.
- I don't think MPI_NO_THREAD_CONTENTION is really necessary. The
original thread level settings, in particular, the use of anything but
MPI_THREAD_MULTIPLE, seem to capture the semantics that you proposed.
- I can't fully follow the motivation for MPI_NO_ANY_SOURCE
deprioritization. AFAIK, a rendezvous exchange usually starts with a
ready-to-send packet that contains the size of the message. In this case
the receiving side will normally reply with a ready-to-receive
regardless of the buffer space available, and flag MPI_ERR_TRUNCATED on
message arrival if necessary. In this case, neither MPI_ANY_SOURCE not
MPI_NO_ANY_SOURCE seem to get into way.
 
Best regards.
 
Alexander
 
________________________________

From: Supalov, Alexander 
Sent: Friday, June 20, 2008 8:29 AM
To: 'MPI 3.0 Sub-setting working group'
Subject: RE: [Mpi3-subsetting] MPI subsetting: charting the way forward
at atelecon next week?

Dear Dick,
 
Thank you. I remember we exchanged a couple of emails about the possible
extensions to the set of assertions, like one-sided and I/O, and in my
recollection, almost reached an agreement that this can improve
performance and possibly memory footprint, as well as be expressed thru
assertions. Do you still feel favorable about this?
 
Best regards.
 
Alexander

________________________________

From: mpi3-subsetting-bounces_at_[hidden]
[mailto:mpi3-subsetting-bounces_at_[hidden]] On Behalf Of
Richard Treumann
Sent: Thursday, June 19, 2008 9:01 PM
To: MPI 3.0 Sub-setting working group
Subject: Re: [Mpi3-subsetting] MPI subsetting: charting the way forward
at atelecon next week?

Hello to the Subset WG

I appreciate the interest in my proposal for Init time assertions.
Unfortunately I will not be able to come to the next Forum meeting to
discuss face to face.

I did write up a fairly detailed draft a few weeks back and post it on
the MPI 2.2 Wiki at:
http://svn.mpi-forum.org/trac/mpi-forum-web/wiki/InitTimeAssertions

Maybe that will help clarify what I have in mind. My proposal does not
include "hints" so I did not discuss the definition of a hint. I did try
to be firm about the meaning of an assertion.

Dick Treumann

Dick Treumann - MPI Team/TCEM 
IBM Systems & Technology Group
Dept 0lva / MS P963 -- 2455 South Road -- Poughkeepsie, NY 12601
Tele (845) 433-7846 Fax (845) 433-8363

---------------------------------------------------------------------
Intel GmbH
Dornacher Strasse 1
85622 Feldkirchen/Muenchen Germany
Sitz der Gesellschaft: Feldkirchen bei Muenchen
Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer
Registergericht: Muenchen HRB 47456 Ust.-IdNr.
VAT Registration No.: DE129385895
Citibank Frankfurt (BLZ 502 109 00) 600119052

This e-mail and any attachments may contain confidential material for
the sole use of the intended recipient(s). Any review or distribution
by others is strictly prohibited. If you are not the intended
recipient, please contact the sender and delete all copies.





* 
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.mpi-forum.org/pipermail/mpi3-subsetting/attachments/20080620/86ff9c1f/attachment.html>