It really helps if you tell us *something* about the problem - like what version of OMPI you are using. :-/
At a guess, you are possibly using 1.6.x. If so, then you are missing your default hostfile. You can work around the problem by adding "--default-hostfile none" to the cmd line. On May 28, 2013, at 3:53 AM, mohamed khuili <khuilimoha...@gmail.com> wrote: > I run openmpi and i get this message > Open RTE was unable to open the hostfile: > /usr/lib64/mpi/gcc/openmpi/etc/openmpi-default-hostfile > Check to make sure the path and filename are correct. > > what is the solution, please? > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users