[mpich-discuss] building 32 bit shmem on 64 bit linux system

[Anthony Chan]

If your MPI program does not rely on any MPICH1 runtime behavior,
you should just recompile your program with MPICH2. It should just
work.  Give it a try.

A.Chan
----- "Daniel Fetchinson" <fetchinson at googlemail.com> wrote:

> Thanks Anthony, that worked!
> 
> Concerning MPICH2: I'm not in a position to change the communication
> routines in the code  I use so this would only be an option if MPICH2
> is fully backward compatible with MPICH1. Is this the case? Can I
> just
> start using MPICH2 without changing anything in the code if it works
> with MPICH1?
> 
> Cheers,
> Daniel
> 
> 
> > Since you are using MPICH-1, you can try setting CC, F77 and F90
> >
> > CC="gcc -m32"
> > F77="g77 -m32"
> > ....
> >
> > BTW, can you use MPICH2 instead ?  We have shifted all our
> development
> > effort to MPICH2 which is more robust than MPICH-1.  If you are
> using
> > MPICH2, setting CFLAGS and FFLAGS should work, and you can use
> nemesis
> > which shared memory for intranode communication.
> >
> > A.Chan
> >
> > ----- "Daniel Fetchinson" <fetchinson at googlemail.com> wrote:
> >
> >> Hi folks,
> >>
> >> I'd like to build the 32-bit shmem mpi library because the code
> I'll
> >> use with mpi only works in 32-bit because of some 32-bit specific
> >> assembly code. The machine is a 64-bit machine with a 64-bit linux
> >> distribution (suse).
> >>
> >> I tried configuring mpich-1.2.7p1 in a number of ways:
> >>
> >> ./configure --with-device=ch_shmem
> >> ./configure --with-arch=LINUX --with-device=ch_shmem
> >> ./configure --with-arch=LINUX32 --with-device=ch_shmem
> >> ./configure --with-arch=i386 --with-device=ch_shmem
> >>
> >> with and without setting the following environment variables (in
> >> bash):
> >>
> >> export CFLAGS=-m32
> >> export FFLAGS=-m32
> >>
> >> Configuring went all right but none of the above combinations
> worked
> >> with 'make' unfortunately :(
> >> The error in 'make' is the following:
> >>
> >> /home/fetchinson/mpich-1.2.7p1/bin/mpicc  -o overtake overtake.o
> >> test.o
> >>
> /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/bin/ld:
> >> skipping incompatible
> /home/fetchinson/mpich-1.2.7p1/lib/libmpich.a
> >> when searching for -lmpich
> >>
> /usr/lib64/gcc/x86_64-suse-linux/4.2.1/../../../../x86_64-suse-linux/bin/ld:
> >> cannot find -lmpich
> >> collect2: ld returned 1 exit status
> >> make[4]: *** [overtake] Error 1
> >> make[3]: [linktest1] Error 2 (ignored)
> >> Could not link a C program with MPI libraries
> >> make[3]: *** [linktest1] Error 1
> >> make[2]: *** [linktest] Error 2
> >> make[1]: *** [mpi-lib-test] Error 2
> >> make: *** [mpi] Error 2
> >>
> >> Which makes me believe that I was not able to convince the
> >> compiler/linker/etc that I really want everything in 32-bit.
> >>
> >> What would be the correct way of compiling the whole mpi library
> to
> >> 32-bit?
> >>
> >> Cheers,
> >> Daniel
> >
> >
> 
> 
> -- 
> Psss, psss, put it down! - http://www.cafepress.com/putitdown