We don't support the ability to add a new host during a comm_spawn call in the 1.3 series. This is a feature that is being added for the upcoming new feature series release (tagged 1.5).
There are two solutions to this problem in 1.3: 1. declare all hosts at the beginning of the job. You can then specify which one to use with the "host" key. 2. you -can- add a hostfile to the job during a comm_spawn. This is done with the "add-hostfile" key. All the hosts in the hostfile will be added to the job. You can then specify which host(s) to use for this particular comm_spawn with the "host" key. All of this is documented - you should see it with a "man MPI_Comm_spawn" command. If you need to dynamically add a host via "host" before then, you could try downloading a copy of the developer's trunk from the OMPI web site. It is implemented there at this time - and also documented via the man page. Ralph On Tue, Sep 15, 2009 at 5:14 PM, Jaison Paul <jmule...@cs.anu.edu.au> wrote: > Hi All, > I am waiting on some inputs on my query. I just wanted to know whether I > can run dynamic child processes using 'MPI_Comm_spawn' on remote hosts? (in > openmpi 1.3.2)). Has anyone did that successfully? Or OpenMPI hasnt > implemented it yet? > > Please help. > > Jaison > http://cs.anu.edu.au/~Jaison.Mulerikkal/Home.html<http://cs.anu.edu.au/%7EJaison.Mulerikkal/Home.html> > > > > > On 14/09/2009, at 8:45 AM, Jaison Paul wrote: > > Hi, > > I am trying to create a library using OpenMPI for an SOA middleware for my > Phd research. "MPI_Comm_spawn" is the one I need to go for. I got a > sample example working, but only on the local host. Whenever I try to run > the spawned children on a remote hosts, parent cannot launch children on > remote hosts and I get the following error message: > > ------------------BEGIN MPIRUN AND ERROR MSG------------------------ > mpirun --prefix /opt/mpi/ompi-1.3.2/ --mca btl_tcp_if_include eth0 -np 1 > /home/jaison/mpi/advanced_MPI/spawn/manager > Manager code started - host headnode -- myid & world_size 0 1 > Host is: myhost > WorkDir is: /home/jaison/mpi/advanced_MPI/spawn/lib > -------------------------------------------------------------------------- > There are no allocated resources for the application > /home/jaison/mpi/advanced_MPI/spawn//lib > that match the requested mapping: > > > Verify that you have mapped the allocated resources properly using the > --host or --hostfile specification. > -------------------------------------------------------------------------- > -------------------------------------------------------------------------- > A daemon (pid unknown) died unexpectedly on signal 1 while attempting to > launch so we are aborting. > > There may be more information reported by the environment (see above). > > This may be because the daemon was unable to find all the needed shared > libraries on the remote node. You may set your LD_LIBRARY_PATH to have the > location of the shared libraries on the remote nodes and this will > automatically be forwarded to the remote nodes. > -------------------------------------------------------------------------- > mpirun: clean termination accomplished > --------------------------END OF ERROR > MSG----------------------------------- > > I use the reserved keys - 'host' & 'wdir' - to set the remote host and work > directory using MPI_Info. Here is the code snippet: > > --------------------------BEGIN Code > Snippet----------------------------------- > MPI_Info hostinfo; > MPI_Info_create(&hostinfo); > MPI_Info_set(hostinfo, "host", "myhost"); > MPI_Info_set(hostinfo, "wdir", > "/home/jaison/mpi/advanced_MPI/spawn/lib"); > > // Checking for 'hostinfo'. The results are okay (see above) > int test0 = MPI_Info_get(hostinfo, "host", valuelen, value, &flag); > int test = MPI_Info_get(hostinfo, "wdir", valuelen, value1, &flag); > printf("Host is: %s\n", value); > printf("WorkDir is: %s\n", value1); > > sprintf( launched_program, "launched_program" ); > > MPI_Comm_spawn( launched_program, MPI_ARGV_NULL , number_to_spawn, > hostinfo, 0, MPI_COMM_SELF, &everyone, > MPI_ERRCODES_IGNORE ); > > --------------------------END OF Code > Snippet----------------------------------- > > I've set the LD_LIBRARY_PATH correctly. Is "MPI_Comm_spawn" implemented in > open mpi (I am using version 1.3.2)? If so, where am I going wrong? Any > input will be very much appreciated. > > Thanking you in advance. > > Jaison > jmule...@cs.anu.edu.au > http://cs.anu.edu.au/~Jaison.Mulerikkal/Home.html<http://cs.anu.edu.au/%7EJaison.Mulerikkal/Home.html> > > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
