Hi Brice, > Can you have a startup script set > HWLOC_XMLFILE=/common/path/${hostname}.xml in the system-wide > environment?
That's precisely what I'd been trying, but it proved exceedingly difficult to figure out what environment file is read when mpirun is run directly, when torque runs the job, etc. It seems that neither bashrc nor profile do the job, so I'm now exploring possibilities for ssh environment variable injection... I'll keep digging, thanks a lot for your help and pointers. Cheers, Andrej