Hi, Thanks for the clarification. So, now I am wondering how rank information regarding processes in MPI_COMM_WORLD are assigned. Is there a table that stores unique integer values for processess or is rank assignment done in some other manner?
Thanks, Sajjad Tabib Tim Prins <tpr...@cs.indiana.edu> Sent by: devel-boun...@open-mpi.org 11/30/07 07:22 AM Please respond to Open MPI Developers <de...@open-mpi.org> To Open MPI Developers <de...@open-mpi.org> cc Subject Re: [OMPI devel] Using ompi_proc_t's proc_name.vpid as Universal rank Hi Sajjad, The vpid is not unique. If you do a comm_spawn then the newly launched processes will have a new jobid, and their vpids will start at 0. So the whole process name is unique. However, there is talk now of being able to join 2 jobs that were started completely independently. This may lead to the point where a process name is no longer unique, however this work appears to be a ways out and as far as I know no decisions have been made on it yet. Hope this helps, Tim Sajjad Tabib wrote: > > Hello, > > I have a proprietary transport/messaging layer that sits below an MTL > component. This transport layer requires OpenMPI to assign it a rank > that is unique and specific to that process and will not change from > execution to termination. In a way, I am trying to find a one-one > correspondence between a process's universal rank in OpenMPI and this > transport layer. I began looking at ompi_proc_t from different processes > and seemingly found a unique identifier, proc_name.vpid. Consequently, I > assigned the ranks to each process in my transport layer based on the > value of the local vpid of each process. > I have not tested this thoroughly, but it has been working so far. > Although, I would like to make sure that this is a good approach, or > know, at least, whether if there are other ways to do this. I would > appreciate it if you could leave me feedback or give suggestions on how > to assign universal ranks to a proprietary transport software. > > Thanks for your help, > > Sajjad Tabib > > > ------------------------------------------------------------------------ > > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel _______________________________________________ devel mailing list de...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/devel
