Am 05.05.2012 18:59, schrieb Philippe Waroquiers:
> On Sat, 2012-05-05 at 18:14 +0200, Martin Kalany wrote:
>>> Is the 'cannot open' error only there when running under Valgrind ?
>> Yes. When I use mpirun, it's fine.
>>
>> What I think is strange that valgrind apperantly tries to load
>> libmpi.so, although it should load libmpich.so.1.0
>>
>>> Maybe a problem related to the dynamic loader ?
>> I'm rather new to MPI so I'm not sure about this.
> Valgrind is not supposed to change which shared lib are used:
> the dynamic loader is executed by Valgrind and should behave
> the same (and so load the same shared libs as a native run).
>
> I know nothing abound MPI and so might not understand
> what you are doing.
> But I believe mpirun is a shell script
> which might be needed to setup some required env variables.
>
> So, to be sure, mpirun should be used also when using Valgrind
> e.g.
> valgrind --trace-children=yes mpirun ....
>
> (or is this what you are doing already ?)
>
>
> Philippe
I'm already doing that, but in a slightly different way:
LD_PRELOAD=~/valgrind/valgrind-3.7.0/mpi/libmpiwrap-x86-linux.so \
mpirun -np 2 valgrind ./foo
(This is suggested in the mpi section of the valgrind documentation).
This way, mpirun will launch two processes; each process starts valgrind
which will in turn execute the actual program.
I did exactly as the documentation does; I think the main issue is this:
>Valgrind documation states that "The MPI functions to be wrapped are assumed
>to be in an ELF shared object with soname matching libmpi.so*. This is
>known>to be correct at least for Open MPI and Quadrics MPI, and can easily be
>changed if required."
How and where do I change that?
Martin
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