Hi,
> On my sl51 (32-bit) boxes mpif90 objects the the 'integer : :  ierror' 
> line.  Maybe my compiler is feeling odd...
>
> Replacing it with 'integer ierror' lets it compile for me.
I have no problem with the compilation. The problems occur only when 
trying to run the resulting executable file.
> If I run the result I get no hang, but then i get not much useful 
> output either :-)
>
> $ mpirun ./x
> libibverbs: Fatal: couldn't read uverbs ABI version.
> -------------------------------------------------------------------------- 
>
> [0,1,0]: OpenIB on host unfair.damtp.cam.ac.uk was unable to find any 
> HCAs.
> Another transport will be used instead, although this may result in
> lower performance.
> -------------------------------------------------------------------------- 
>
> -------------------------------------------------------------------------- 
>
> [0,1,0]: uDAPL on host unfair.damtp.cam.ac.uk was unable to find any 
> NICs.
> Another transport will be used instead, although this may result in
> lower performance.
> -------------------------------------------------------------------------- 
>
That piece of code I wrote on my previous message doesn't output 
anything. If the executable is successfully executed, then it outputs no 
data, but shouldn't hang. It just makes use of the mpi library.
>
> In case it matters that box has:
>
> $ rpm -q sl-release gcc-gfortran openmpi openmpi-devel
> sl-release-5.1-2.i386
> gcc-gfortran-4.1.2-14.el5.i386
> openmpi-1.2.3-4.el5.i386
> openmpi-devel-1.2.3-4.el5.i386
The problem seem to be on the OpenIB support. I compiled OpenMPI from 
source without OpenIB support as well as I've built a new RPM without 
the OpenIB support and I have no problems when executing the file.
> Debugging mpi problems is always a bit of a nightmare.  BTW how many 
> processors were you running it on?
>
> I'm still worrying about updating our systems to the (newer) openmpi 
> from sl52 as the package maintainers have switched from alternatives 
> (which I sort of understand) to mpi-selector (which I don't)...
I run it just on a dual-core desktop machine. I tried with SL5.2 
packages as well but I had the same problems.

Cheers,
Panos

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