Newsgroups: comp.parallel.mpi From: Lars Rzymianowicz Subject: Re: Using MPI to communicate between seperate binaries in LINUX Organization: Dept. of Computer Engineering, University of Mannheim, Germany Date: Thu, 16 Jul 1998 09:45:31 +0200 Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Message-ID: <35ADAF9A.FE4AB8C5@mufasa.informatik.uni-mannheim.de> Mark wrote: > ...All of the nodes will be running a copy of the same program, > while the root machine will be running a different program. The node > programs need to be able to send a message to the root program if they > find an error. Can anyone show me how to use MPI to communicate between > these seperate programs?? Hi Mark, no problem. Write your both apps and compile them. Then start them via mpirun with a special procgroup file (-p4pg flag) like: master_node 1 root_program slave_node0 1 slave_program ... slave_noden 1 slave_program If you want different executables communicate via MPI calls, they must be started together, since at start-up the info "which process runs where" is distributed via this procgroup file. Lars -- email: lr@mufasa.informatik.uni-mannheim.de Homepage: http://mufasa.informatik.uni-mannheim.de/lsra/persons/lars/