[Mpi3-ft] Defining the state of MPI after an error

[Richard Treumann]

How does an application experience errors in classes (MPI_ERR_COUNT, 
MPI_ERR_TAG) except by a bug in the application itself?

How can it be easier for someone to know how to continue from an arbitrary 
application bug with confidence that the application is still giving good 
answers, than to just fix the app?


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




From:
Joshua Hursey <jjhursey at open-mpi.org>
To:
"MPI 3.0 Fault Tolerance and Dynamic Process Control working Group" 
<mpi3-ft at lists.mpi-forum.org>
Date:
09/20/2010 10:05 AM
Subject:
[Mpi3-ft] Defining the state of MPI after an error
Sent by:
mpi3-ft-bounces at lists.mpi-forum.org



During EuroMPI and the MPI Forum meeting last week the issue of the MPI 
state after an error was brought up a few times. The issue is that since 
the state is undefined then no portable program can be written that uses 
the errorhandlers then MPI functionality following the error. This issue 
is particularly difficult for applications that wish to catch 
informational or warning type errors (e.g., MPI_ERR_COUNT, MPI_ERR_TAG, 
MPI_ERR_UNSUPPORTED_OPERATION). These operations are often recoverable by 
the MPI implementation and/or the application.

To address this portability issue, I am bringing out the 
MPI_ERR_CANNOT_CONTINUE error class from the stabilization proposal. I 
presented the idea to the MPI Forum during a plenary session last week and 
received a positive response on building a formal proposal [Straw vote: 22 
(yes), 0 (no), 3 (abstain)].

I have created a first draft of the proposal for the working group to 
review on the wiki at the link below:
  https://svn.mpi-forum.org/trac/mpi-forum-web/wiki/ft/err_cannot_continue

I would like to have this proposal ready by the Oct. meeting so we can 
have a formal plenary session on it. If all goes well, maybe we can get a 
first reading by Dec.

Let me know what you think about this proposal.

-- Josh

------------------------------------
Joshua Hursey
Postdoctoral Research Associate
Oak Ridge National Laboratory
http://www.cs.indiana.edu/~jjhursey


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