See, it was a simple thing. Thank you for the information. I am trying it now. Have to recompile and re-install openmpi for a heterogeneous network.
Now, knowing what to search for, I found that I can set the configuration of the cluster in a file that mpirun and mpiexec can read. mpirun --app my_appfile where app file contains the same --host information. Makes customizing the cluster for certain applications very easy. Thanks for the guidance to this MPI newbie. Lee On Wed, Jan 27, 2010 at 11:43 PM, jody <jody....@gmail.com> wrote: > Hi > I'm not sure i completely understood. > Is it the case that an application compiled on the dell will not work > on the PS3 and vice versa? > > If this is the case, you could try this: > shell$ mpirun -np 1 --host a app_ps3 : -np 1 --host b app_dell > where app_ps3 is your application compiled on the PS3 and a is your PS3 > host, > and app_dell is your application compiled on the dell, and b is your dell > host. > > Check the MPI FAQs > http://www.open-mpi.org/faq/?category=running#mpmd-run > http://www.open-mpi.org/faq/?category=running#mpirun-host > > Hope this helps > Jody > > On Thu, Jan 28, 2010 at 3:08 AM, Lee Manko <lma...@gblsys.com> wrote: > > OK, so please stop me if you have heard this before, but I couldn’t find > > anything in the archives that addressed my situation. > > > > > > > > I have a Beowulf cluster where ALL the node are PS3s running Yellow Dog > > Linux 6.2 and a host (server) that is a Dell i686 Quad-core running > Fedora > > Core 12. After a failed attempt at letting yum install openmpi, I > > downloaded v1.4.1, compiled and installed on all machines (PS3s and > > Dell). I have an NSF shared directory on the host where the application > > resides after building. All nodes have access to the shared volume and > they > > can see any files in the shared volume. > > > > > > > > I wrote a very simple master/slave application where the slave does a > simple > > computation and gets the processor name. The slave returns both pieces > of > > information to the master who then simply displays it in the terminal > > window. After the slaves work on 1024 such tasks, the master exists. > > > > > > > > When I run on the host, without distributing to the nodes, I use the > > command: > > > > > > > > “mpirun –np 4 ./MPI_Example” > > > > > > > > Compiling and running the application on the native hardware works > perfectly > > (ie: compiled and run on the PS3 or compiled and run on the Dell). > > > > > > > > However, when I went to scatter the tasks to the nodes, using the > following > > command, > > > > > > > > “mpirun –np 4 –hostfile mpi-hostfile ./MPI_Example” > > > > > > > > the application fails. I’m surmising that the issue is with running code > > that was compiled for the Dell on the PS3 since the MPI_Init will launch > the > > application from the shared volume. > > > > > > > > So, I took the source code and compiled it on both the Dell and the PS3 > and > > placed the executables in /shared_volume/Dell and /shared_volume/PS3 and > > added the paths to the environment variable PATH. I tried to run the > > application from the host again using the following command, > > > > > > > > “mpirun –np 4 –hostfile mpi-hostfile –wdir > > /shared_volume/PS3 ./MPI_Example” > > > > > > > > Hoping that the wdir would set the working directory at the time of the > call > > to MPI_Init() so that MPI_Init will launch the PS3 version of the > > executable. > > > > > > > > I get the error: > > > > Could not execute the executable “./MPI_Example” : Exec format error > > > > This could mean that your PATH or executable name is wrong, or that you > do > > not > > > > have the necessary permissions. Please ensure that the executable is > able > > to be > > > > found and executed. > > > > > > > > Now, I know I’m gonna get some heat for this, but all of these machine > use > > only the root account with full root privileges, so it’s not a permission > > issue. > > > > > > > > > > > > I am sure there is simple solution to my problem. Replacing the host > with a > > PS3 is not an option. Does anyone have any suggestions? > > > > > > > > Thanks. > > > > > > > > PS: When I get to programming the Cell BE, then I’ll use the IBM Cell SDK > > with its cross-compiler toolchain. > > > > _______________________________________________ > > 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 >
