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

[Daniel Fetchinson]

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
>
>


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