No, it is not a documentation bug. You are replacing the Fortran compiler that the wrapper uses with a compiler from a completely different family. The FAQ entry advises against messing with the wrapper configuration, selected during library build time. Listing all possible effects that might result from changing the compiler is not an option.
However, it works if for example you configure Open MPI with the system supplied version of gfortran and then specify a later gfortran version, e.g. OMPI_FC=gfortran-4.7 (unless the module format has changed in the meantime). Kind regards, Hristo -- Hristo Iliev, PhD High Performance Computing Team RWTH Aachen University, Center for Computing and Communication Rechen- und Kommunikationszentrum der RWTH Aachen Seffenter Weg 23, D 52074 Aachen (Germany) Phone: +49 241 80 24367 Fax/UMS: +49 241 80 624367 From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of Dominik Goeddeke Sent: Wednesday, March 13, 2013 10:17 AM To: us...@open-mpi.org Subject: Re: [OMPI users] bug in mpif90? OMPI_FC envvar does not work with 'use mpi' Hi, thanks, I remember that now. So it is a "documentation bug" in that particular FAQ entry. Dominik On 03/13/2013 09:58 AM, Iliev, Hristo wrote: Hi, Dominik, gfortran and ifort produce Fortran module files (*.mod) with completely different and hence incompatible formats. You cannot use a module compiled with gfortran in ifort and vice versa. That's why many Fortran libraries come with explicit module interface definitions that have to be compiled with the specific Fortran compiler before the library can be used as a module. Hope that helps to clarify the issue. Kind regards, Hristo -- Hristo Iliev, PhD High Performance Computing Team RWTH Aachen University, Center for Computing and Communication Rechen- und Kommunikationszentrum der RWTH Aachen Seffenter Weg 23, D 52074 Aachen (Germany) Phone: +49 241 80 24367 Fax/UMS: +49 241 80 624367 -----Original Message----- From: users-boun...@open-mpi.org [mailto:users-boun...@open-mpi.org] On Behalf Of Dominik Goeddeke Sent: Tuesday, March 12, 2013 10:32 PM To: Open MPI Users Subject: [OMPI users] bug in mpif90? OMPI_FC envvar does not work with 'use mpi' Dear OMPI folks, according to this FAQ entry http://www.open-mpi.org/faq/?category=mpi-apps#override-wrappers- after-v1.0 one way to use the mpif90 compiler wrapper with another compiler than Open-MPI was built with is to set the envvar OMPI_FC to the other compiler. Using this simple toy code program test implicit none include 'mpif.h' integer :: ierr call MPI_Init(ierr) print *, "Hello" call MPI_Finalize(ierr) end program test I indeed see the expected (and documented) behaviour: bash$ export OMPI_FC=ifort bash$ mpif90 test.f90 bash$ mpirun -np 3 ./a.out Now, If I replace these two lines in the reproducer implicit none include 'mpif.h' with these two lines (which is actually the MPI-2 way of doing things, as Jeff himself praises in this blog entry: http://blogs.cisco.com/performance/a-bucket-full-of-new-mpi-fortran- features) use mpi implicit none I get this as the output of mpif90: test.f90(7): error #7013: This module file was not generated by any release of this compiler. [MPI] use mpi ----^ compilation aborted for test.f90 (code 1) There seems to be no language on this particular problem in the FAQs, so I assume this is either a documentation bug or an actual bug in the compiler wrappers. The approach is clearly marked as "not recommended", but actually, this problem can be quite a showstopper because on laptops, people (like me) are often too lazy to compile Open-MPI (and consequently, valgrind and friends) multiple times, especially since the FAQ says that this should work :) I am using the system gcc of ubuntu 12.04 (4.6.3-1ubuntu5) and OMPI 1.6.3. Of course everything works if I use a properly installed machine that provides OpenMPI-builds for different compilers via modules, and also the oldish "include 'mpif.h'" approach is a sufficient workaround. Thanks for any clarification, hope this reproducer helps, Cheers, Dominik -- Jun.-Prof. Dr. Dominik Göddeke Hardware-orientierte Numerik für große Systeme Institut für Angewandte Mathematik (LS III) Fakultät für Mathematik, Technische Universität Dortmund http://www.mathematik.tu-dortmund.de/~goeddeke Tel. +49-(0)231-755-7218 Fax +49-(0)231-755-5933 _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users _______________________________________________ users mailing list us...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/users -- Jun.-Prof. Dr. Dominik Göddeke Hardware-orientierte Numerik für große Systeme Institut für Angewandte Mathematik (LS III) Fakultät für Mathematik, Technische Universität Dortmund http://www.mathematik.tu-dortmund.de/~goeddeke Tel. +49-(0)231-755-7218 Fax +49-(0)231-755-5933
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