Also, did you remember to configure with --enable-heterogeneity? On Jan 28, 2010, at 12:43 AM, jody 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
