I would propose the following names:
MPI_THREAD_SINGLE
MPI_THREAD_MAIN_OUTOF_MANY
MPI_THREAD_ONE_OUTOF_MANY
MPI_THREAD_ALL_OUTOF_MANY or MPI_THREAD_ANY_OUTOF_MANY
Jean-Pierre
(Embedded
image moved snir @ watson.ibm.com
to file: 03/14/97 06:04 PM
PIC19740.PCX)
To: salo @ mrjones.engr.sgi.com
cc: Mpi-External @ mcs.anl.gov (bcc: Jean-Pierre Prost/Watson/IBM
Research)
Subject: Re: new version of threads
section
To: mpi-external @ mcs.anl.gov
cc: (bcc: Marc Snir/Watson/IBM Research)
Subject: Re: new version of threads section
I really like defining the new MPI_THREAD_INIT() routine as an alternative
to MPI_INIT(). Some random thoughts:
- What happens if MPI is unable to provide the requested level of
strictness? Is this an error?
***
MPI should provide as much strictness as it can, and let the user abort if
this is not enough. I shall clarify
****
- The names for the different degees of strictness are a bit of a mess; it
would not be immediately obvious to the casual observer that they are
related. So I would propose the following (still imperfect) names instead:
MPI_THREAD_SINGLE
MPI_THREAD_MULTIPLE_MAIN
MPI_THREAD_MULTIPLE_ONE
MPI_THREAD_MULTIPLE_MANY
MPI_THREAD_QUERY (see below)
*****
I am not sure these names are obvious either. Should think about it.
*****
I think it would also be nice if we specified that these values should
translate to integers with increasing values, so that programmers can just
use a simple greater-than/less-than test instead of a switch/case
statement.
***
OK
****
- Adding yet another flavor of MPI_INITIALIZED() is ugly, especially since
it breaks the symmetry that we just gave ourselves by adding
MPI_FINALIZED(). Instead, I propose that we add a MPI_THREAD_QUERY value,
which simply asks MPI_THREAD_INIT() to return the current level of
strictness, or MPI_UNDEFINED if MPI has not yet been initialized.
****
Either is OK by me -- can have a beauty contest. I have replaced the pair
INIT/INITIALIZED by THREAD_INIT/THREAD_INITIALIZED. If we go back to
MPI_THREAD_QUERY, then there is no need to allow this call before INIT.
****
- The new MPI_THREAD_MAIN() routine should more properly be named
MPI_THREAD_IS_MAIN()
*****
OK
****
- Let's do keep the argc/argv arguments out, please!
****
OK
*****
-- Eric Salo Silicon Graphics Inc. salo@sgi.com
########################################## Jean-Pierre Prost IBM T.J. Watson Research Center PO Box 218 Yorktown Heights, NY 10598 USA Phone: (914) 945 3225 - Fax: (914) 945 2141 Lotus Notes: Jean-Pierre Prost @ IBM Research Internet: jpprost@watson.ibm.com URL: http://www.research.ibm.com/people/p/prost/ ##########################################
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