Hi I solved this problem in such a way that my master listens for messages from everybody (MPI_ANY_SOURCE) and reacts to all tags (MPI_ANY_TAG). By looking at the status variable set by MPI_Recv, the master can find out who sent the message (status.MPI_SOURCE) and what tag it has (status.MPI_TAG) and react accordingly
Jody On Tue, Jul 6, 2010 at 7:41 AM, David Zhang <solarbik...@gmail.com> wrote: > if the master receives multiple results from the same worker, how does the > master know which result (and the associated tag) arrive first? what MPI > commands are you using exactly? > > On Mon, Jul 5, 2010 at 4:25 PM, Jack Bryan <dtustud...@hotmail.com> wrote: >> >> When the master sends out the task, it assign a distinct task number ID >> to >> the task. >> When the worker receive the task, it still use the task's assigned ID as >> task tag to send it to master. >> Any help is appreciated. >> July 5 2010 >> >> >> >> ________________________________ >> From: solarbik...@gmail.com >> Date: Mon, 5 Jul 2010 13:17:27 -0700 >> To: us...@open-mpi.org >> Subject: Re: [OMPI users] Open MPI, cannot get the results from workers >> >> how does the master receive results from the workers? if a worker is >> sending multiple task results, how does the master knows what the message >> tags are ahead of time? >> >> On Sun, Jul 4, 2010 at 10:26 AM, Jack Bryan <dtustud...@hotmail.com> >> wrote: >> >> Dear All : >> I designed a master-worker framework, in which the master can schedule >> multiple tasks (numTaskPerWorkerNode) to each worker and then collects >> results from workers. >> if the numTaskPerWorkerNode = 1, it works well. >> But, if numTaskPerWorkerNode > 1, the master cannot get the results from >> workers. >> But, the workers can get the tasks from master. >> why ? >> >> I have used different taskTag to distinguish the tasks, but still does not >> work. >> Any help is appreciated. >> Thanks, >> Jack >> July 4 2010 >> ________________________________ >> The New Busy is not the too busy. Combine all your e-mail accounts with >> Hotmail. Get busy. >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users >> >> >> >> -- >> David Zhang >> University of California, San Diego >> >> ________________________________ >> The New Busy is not the old busy. Search, chat and e-mail from your inbox. >> Get started. >> _______________________________________________ >> users mailing list >> us...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/users > > > > -- > David Zhang > University of California, San Diego > > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users >
