There are multiple ways to set MCA parameters - you can checkout the FAQ to see all of them:

In your immediate case, just add -mca btl_openib_warn_default_gid_prefix 0 to your cmd line.


On Dec 8, 2008, at 1:49 AM, Yasmine Yacoub wrote:

Good morning,
I have explain my problem lat time and still I haven't receive any response.
ok, my problem is that after installing pwscf and running one scf example, I got the output but with this warning message :
WARNING: There are more than one active ports on host 'stallo-2.local', but the
default subnet GID prefix was detected on more than one of these
ports.  If these ports are connected to different physical IB
networks, this configuration will fail in Open MPI.  This version of
Open MPI requires that every physically separate IB subnet that is
used between connected MPI processes must have different subnet ID
Please see this FAQ entry for more details:
NOTE: You can turn off this warning by setting the MCA parameter
      btl_openib_warn_default_gid_prefix to 0.


So, please how can I turn off this warning? I have already tried to follow the steps indicated in the link above but it doesn't work. what is exactly the command I have to use?



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