All of the hosts that will be used in the job must be included in the original hostfile - even if the hosts won't be used until comm_spawn.
The name in the hostfile must match the name provided in the info object as we otherwise would have to do DNS resolves to detect the alias, which would have a significant performance impact. On Jan 19, 2010, at 10:05 AM, Federico Golfrè Andreasi wrote: > Hi everyone ! > > I have to submit you a question, > I write a little code that does and MPI_Comm_spawn_multiple on a specific set > of node. > The node where to run on are specified using the "host" attribute of the > MPI_Info object. > That attribute is filled with the string get from MPI_Get_processor_name. > > Is this the correct way of working ? > > I have a strange behavior when I use alias in the /etc/hosts file. > (I run jobs in a linux cluster, with CentOS 5). > If I use the alias in the hostfile the spawn process throws me an error; > instead the spawning process (run with the same hostfile) runs correctly. > > It seems that is necessary, when using the spawn function with INFO object, > to run the spawning process with a hostfile filled with the "real" and > complete hostname. > Or I have to use a different function to get the host name? > > Thank you very much, > Federico > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
