Subject: Re: [Boost-mpi] No arg init
From: Alain O Miniussi (alain.miniussi_at_[hidden])
Date: 2012-12-04 04:53:50
On Thu, 2012-11-29 at 12:55 -0500, Jeremiah Willcock wrote:
> On Thu, 29 Nov 2012, Matthias Troyer wrote:
> > On Nov 29, 2012, at 5:23 PM, Jeremiah Willcock <jewillco_at_[hidden]> wrote:
> >> 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.
> > A valid point - we will have to provide two implementations depending on
> > which version of MPI is present. Is there any standardized macro that
> > one an check to determine the MPI version at compile time?
> There are MPI_VERSION and MPI_SUBVERSION, but those are in 2.0 and above
> only as well. You can probably use their being undefined to mean that the
> implementation does not comply to 2.0. I don't know how many 1.1-only MPI
> implementations are around anymore, though; there may not be any still in
> use (MPI 2.0 was released in 1997).
That's a good point, especially if the "historical" C++ API was not
present in 1.1 (which I think it's the case, it's not clear to me if it
was introduced in 1.2 or 2.0). Maybe we should only take into
consideration 2.0 and 3.0.
Also, if some 1.1 only API are still use, how many requires a Boost.MPI
As far as the no arg init is concerned, it seems to me that that
- providing them will simplify the API,
- even if some 1.1 only MPI are still around, even if some of them have
a use for Boost.MPI, even if those do not support a no arg Init, theirs
users still have the possibility to provide those arguments anyway.
> -- Jeremiah Willcock
> Boost-mpi mailing list
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