FWIW, the README describes some of the Fortran issues:
- Open MPI will build bindings suitable for all common forms of
Fortran 77 compiler symbol mangling on platforms that support it
(e.g., Linux). On platforms that do not support weak symbols (e.g.,
OS X), Open MPI will build Fortran 77 bindings just for the compiler
that Open MPI was configured with.
Hence, on platforms that support it, if you configure Open MPI with
a Fortran 77 compiler that uses one symbol mangling scheme, you can
successfully compile and link MPI Fortran 77 applications with a
Fortran 77 compiler that uses a different symbol mangling scheme.
NOTE: For platforms that support the multi-Fortran-compiler bindings
(i.e., weak symbols are supported), due to limitations in the MPI
standard and in Fortran compilers, it is not possible to hide these
differences in all cases. Specifically, the following two cases may
not be portable between different Fortran compilers:
1. The C constants MPI_F_STATUS_IGNORE and MPI_F_STATUSES_IGNORE
will only compare properly to Fortran applications that were
created with Fortran compilers that that use the same
name-mangling scheme as the Fortran compiler that Open MPI was
configured with.
2. Fortran compilers may have different values for the logical
.TRUE. constant. As such, any MPI function that uses the Fortran
LOGICAL type may only get .TRUE. values back that correspond to
the the .TRUE. value of the Fortran compiler that Open MPI was
configured with. Note that some Fortran compilers allow forcing
.TRUE. to be 1 and .FALSE. to be 0. For example, the Portland
Group compilers provide the "-Munixlogical" option, and Intel
compilers (version >= 8.) provide the "-fpscomp logicals" option.
You can use the ompi_info command to see the Fortran compiler that
Open MPI was configured with.
On Dec 8, 2008, at 11:46 AM, Brock Palen wrote:
Looks like the same source tree was used cleaned (distclean). So I
don't have config logs for gcc or pgi.. Also I can't find
opal_confg.h in ether the configured/built source or installed
location,
1.2.8+pgi, This library was found to run an executable built with
1.2.6+gcc
Sorry I don't have the files you requested George.
Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
On Dec 8, 2008, at 11:31 AM, George Bosilca wrote:
Black magic happens all the time. To keep it simple, we do not
expect different compilers to be 100% compatible, so this is
completely unsupported by the Open MPI community. Moreover, we
already know some compilers that claim gcc compatibility, when
there are always some [obscure] things that don't really match
(hint icc and gcc).
For Fortran there are even more issues. One was already hinted in a
one of the answers (logical), but more are expected such as the
representation of the "strange" type REAL16 and REAL32 (and the
corresponding COMPLEX types). I'm sure more can be found, but these
are enough not to support the cross-compilers stuff.
Now, I'm really curious that this worked. Do you have access to the
opal_config.h file for the pgi and gcc build ? Or to the config.log
files ? If yes can you share it with us please.
Thanks,
george.
On Dec 7, 2008, at 22:06 , Brock Palen wrote:
I did something today that I was happy worked, but I want to know
if anyone has had problem with it.
At runtime. (not compiling) would a OpenMPI built with pgi work
to run a code that was compiled with the same version but gcc
built OpenMPI ? I tested a few apps today after I accidentally
did this and found it worked. They were all C/C++ apps (namd and
gromacs) but what about fortran apps? Should we expect problems
if someone does this?
I am not going to encourage this, but it is more if needed.
Brock Palen
www.umich.edu/~brockp
Center for Advanced Computing
bro...@umich.edu
(734)936-1985
_______________________________________________
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
_______________________________________________
users mailing list
us...@open-mpi.org
http://www.open-mpi.org/mailman/listinfo.cgi/users
--
Jeff Squyres
Cisco Systems
