I think the “except for” is a pretty significant hole here. It is certainly possible for a C programmer to take the TS 29113 descriptions and write a header file and the utility functions specified there. However, there are some missing parts to having a working implementation for Fortran users. To implement the allocate / deallocate functions you need to know how the Fortran compiler allocates and deallocates memory. Not a big issue for MPI, but this one is: The Fortran compiler has to do the descriptor conversions on the caller side if the C descriptor is different from the internal Fortran one. Compiler support for the new descriptor was the big missing piece in gfortran 4.9.1. I thought the intention was to change the gfortran descriptor to match the C one, to simplify calls. If that’s not in 5.1.0, there is still a big hole. Cheers, Bill On Jun 24, 2015, at 8:02 AM, Jeff Hammond <[email protected]> wrote:
The "except for"="does not work" standard is a fantastic way to demoralize every programmer this side of Don Knuth. Has MPICH ever worked?
Jeff
On Wed, Jun 24, 2015 at 5:11 AM, William Gropp <[email protected]> wrote:
Sounds interesting and useful. However, “except for” is the same as “does not work” when talking about standards.
Bill
William Gropp Director, Parallel Computing Institute Thomas M. Siebel Chair in Computer Science Chief Scientist, NCSA University of Illinois Urbana-Champaign
On Jun 24, 2015, at 3:29 AM, Hubert Ritzdorf <[email protected]> wrote:
Hi,
I used gfortran 4.9.1 and I have build an include file which adopted the definitions of the missing ISO_Fortran_binding.h to the implementation of gfortran (include file libgfortran.h) . Using this I could implement the Fortran binding for TS29113. It works except for arrays of derived Fortran Types which are always transferred via copy in/copy out.
Hubert ________________________________________ From: mpiwg-fortran [[email protected]] on behalf of William Gropp [[email protected]] Sent: Tuesday, June 23, 2015 9:34 PM To: MPI-WG Fortran working group Subject: Re: [MPIWG Fortran] What compilers support TS 29113?
gfortran no, not even with 5.1.0 . It does have a lot of F 2008, but not even all of it, according to https://gcc.gnu.org/wiki/Fortran2008Status and https://gcc.gnu.org/wiki/TS29113Status . Gfortran 5.1 fails the MPICH test because ISO_Fortran_binding.h isn’t available for GCC 5.1 (I don’t know if that’s the right test, but that’s what it does). See also https://gcc.gnu.org/onlinedocs/gfortran/Further-Interoperability-of-Fortran-... .
Bill
William Gropp Director, Parallel Computing Institute Thomas M. Siebel Chair in Computer Science Chief Scientist, NCSA University of Illinois Urbana-Champaign
On Jun 23, 2015, at 2:01 PM, Jeff Squyres (jsquyres) <[email protected]> wrote:
On Jun 23, 2015, at 11:51 AM, Bill Long <[email protected]> wrote:
gfortran - yes (4.9 works on my Mac)
I thought fortran 4.9 did not have the standardized TS 29113 dope vector...?
Cray - yes (8.3 for sure, or later).
I knew about Cray, but I thought it was the only one. That may be incorrect and/or outdated information.
Not sure about others. People who build libraries (mpich, OpenMPI, ...) would know based on which ones can compiler their mpi_f08 module.
Open MPI currently only has the non-TS-29113 interfaces for mpi_f08. We're looking into whether it's time to implement the TS 29113 interfaces; that's the origin of my question. :-)
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