[mpich-discuss] Two different mpif90 (in mpich2) versions giving different output for same source code

[Shitij Bhargava]

Thank you for your replies !

Yes you guys are right. The MPI that I installed was calling ifort, but the
other mpi was calling gfortran. So I ran the program with ifort and
gfortran, and it seems the problem is with ifort. I have asked for help in
the intel forums. I am little new to these things, so I couldn't figure it
out sooner. Sorry about that :)


Thanks !!

On 19 June 2012 21:15, Darius Buntinas <buntinas at mcs.anl.gov> wrote:

> The -show parameter to mpif90 will show the exact command that's used to
> compile the program.  From that you can see which version of the fortran
> compiler is being used by each mpif90 wrapper.  That should help you track
> down the problem.
>
> -d
>
>
> On Jun 19, 2012, at 3:45 AM, Shitij Bhargava wrote:
>
> > Hi all !!
> >
> >
> > I have a simple code in fortran that reads a file, and outputs it as it
> is. I have two different versions of mpif90 in my system. When I compile
> the same program with the two different compilers and examine the output of
> the resulting two executables, they differ. This is just a toy program of
> course, actually I am using MPICH2 with PETSc/SLEPc, and I have the mpif90
> that is configured with PETSc/SLEPc in
>  /home/shitij/Lib/MPI/mpich2-1.3.2/bin/. The problem is that this version
> of mpif90 is giving the wrong output. I am giving the -v outputs of both
> versions below:
> >
> > (this one is configured with PETSc/SLEPc and gives incorrect output)
> > shitij at shitij:~/JNCASR2012$
> /home/shitij/Lib/MPI/mpich2-1.3.2/bin/mpif90 -v
> > mpif90 for MPICH2 version 1.3.2
> > Version 11.0
> >
> > shitij at shitij:~/JNCASR2012$ mpif90 -v
> > Using built-in specs.
> > COLLECT_GCC=/usr/bin/gfortran
> >
> COLLECT_LTO_WRAPPER=/usr/lib/x86_64-linux-gnu/gcc/x86_64-linux-gnu/4.5.2/lto-wrapper
> > Target: x86_64-linux-gnu
> > Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro
> 4.5.2-8ubuntu4' --with-bugurl=file:///usr/share/doc/gcc-4.5/README.Bugs
> --enable-languages=c,c++,fortran,objc,obj-c++ --prefix=/usr
> --program-suffix=-4.5 --enable-shared --enable-multiarch
> --with-multiarch-defaults=x86_64-linux-gnu --enable-linker-build-id
> --with-system-zlib --libexecdir=/usr/lib/x86_64-linux-gnu
> --without-included-gettext --enable-threads=posix
> --with-gxx-include-dir=/usr/include/c++/4.5
> --libdir=/usr/lib/x86_64-linux-gnu --enable-nls --with-sysroot=/
> --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes
> --enable-plugin --enable-gold --enable-ld=default --with-plugin-ld=ld.gold
> --enable-objc-gc --disable-werror --with-arch-32=i686 --with-tune=generic
> --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu
> --target=x86_64-linux-gnu
> > Thread model: posix
> > gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu4)
> >
> > The differences in the files I mentioned are varied (and weird), for
> example some lines are missing (always the same across different runs),
> some line is read half-way/incorrectly, for example a line:
> > ATOM NE2  NR2    -0.70
> > is always read as
> > ATOM NE2      -0.70
> > for some reason.
> >
> > This is the first time I am having a problem like this. Is this a
> problem with installation of MPICH2 ?
> >
> > I am also giving the code below:
> >
> > program exp4
> > implicit none
> >
> >       character(79)::line
> >
> >
> open(unit=1,file='top_all27_prot_na_RTF.txt',action='read',ACCESS='STREAM',FORM='FORMATTED')
> >
> >       do
> >       read(1,'(a)',END=10)line   !! Read line as string
> >       write(*,*)line
> >       enddo
> >       10 write(*,*)'Done !!'
> >
> > end program exp4
> >
> > Thank you for your help in advance !!!
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