On Thu, 29 Nov 2012, Alain O Miniussi wrote:
Hal,
Based on http://www.mpi-forum.org/docs/mpi-20-html/node43.htm#Node43.
Only implementations conforming to MPI1.1 are allowed to require passing
the actual values provided to main, MPI-2 does not.
I don't know what kind of compatibility we want to maintain wrt
MPI1,(afaic, stuff that is in the range 2.x-3.x would be fine) but that
change would only concern a subset of MPI 1.1 implementations, and
passing the arguments would still be allowed.
But I guess the main question is: do we want to deal with 3 versions of
the MPI standard ?
Also, if Boost.MPI is presented as the successor of the C++ bindings,
and if I am correct in assuming that the MPI::Init function always
provided both versions, it would be weird to maintain a pre-existent
limitation.
Another issue with MPI versions is that Boost.MPI currently uses functions
such as MPI_Address that have been removed in MPI 3.0. Is that something
that should be addressed in the future? I think the replacements for some
of them did not exist before MPI 2.0.
-- Jeremiah Willcock
On Thu, 2012-11-29 at 08:33 -0600, Hal Finkel wrote:
Alain,
I thought the system was arranged as it was because some MPI implementations
pass special arguments from the runtime system to the MPI library via special
command-line arguments. Passing the args to MPI_Init allows the library to
intercept those arguments (and erase them from the arg list seen by the rest of
the program). I don't know if any real implementations work this way, but we
may want to be careful about discouraging passing the real arg variables to
MPI_Init.
-Hal
----- Original Message -----
From: "Matthias Troyer" <[email protected]>
To: "alain miniussi" <[email protected]>, "Discussion of Boost.MPI development"
<[email protected]>
Sent: Thursday, November 29, 2012 5:17:35 AM
Subject: Re: [Boost-mpi] No arg init
Hi Alain,
You can indeed provide no arg initialization and just fake arguments
for MPI-1.
Matthais
On Nov 29, 2012, at 12:13 PM, Alain O Miniussi
<[email protected]> wrote:
Hi,
While working on the thread issue, a question arises regarding the
no
arg initialization.
I understand that some MPI1.x might not allow it, but should
BOOST.MPI
refect that choice ? Why can't we just pass dummy empty (argc,argv)
to
MPI_Init(_thread) since, after all, no specific values are required
?
This would simplify our API, and I do not see any down side.
Any though ?
Thanks
--
Alain Miniussi
Responsable Tech. Centre de Calcul Haute Performance
Obs. de la Côte d'Azur |Mont Gros: +33 4 92 00 30 09
BP 4229 |Sophia : +33 4 83 61 85 44
06304 Nice Cedex 4 |https://crimson.oca.eu
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--
Alain Miniussi
Responsable Tech. Centre de Calcul Haute Performance
Obs. de la Côte d'Azur |Mont Gros: +33 4 92 00 30 09
BP 4229 |Sophia : +33 4 83 61 85 44
06304 Nice Cedex 4 |https://crimson.oca.eu
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