Thanks, I am using non-blocking MPI_Isend to send out message and using blocking MPI_Recv to get the message.
Each MPI_Isend use a distinct buffer to hold the message, which is not changed until the message is received. Then, the sender process waits for the MPI_Isend to be finished. Before this message is sent out, a heading message (about how many data and what data will be sent out in the following MPI_Isend) is sent out in the same way, they can be received well. Why the following message (which has larger size) cannot be received ? Any help is really appreciated. > Date: Fri, 30 Sep 2011 11:33:16 -0400 > From: raysonlo...@gmail.com > To: us...@open-mpi.org > Subject: Re: [OMPI users] Open MPI process cannot do send-receive message > correctly on a distributed memory cluster > > You can use a debugger (just gdb will do, no TotalView needed) to find > out which MPI send & receive calls are hanging the code on the > distributed cluster, and see if the send & receive pair is due to a > problem described at: > > Deadlock avoidance in your MPI programs: > http://www.cs.ucsb.edu/~hnielsen/cs140/mpi-deadlocks.html > > Rayson > > ================================= > Grid Engine / Open Grid Scheduler > http://gridscheduler.sourceforge.net > > Wikipedia Commons > http://commons.wikimedia.org/wiki/User:Raysonho > > > On Fri, Sep 30, 2011 at 11:06 AM, Jack Bryan <dtustud...@hotmail.com> wrote: > > Hi, > > > > I have a Open MPI program, which works well on a Linux shared memory > > multicore (2 x 6 cores) machine. > > > > But, it does not work well on a distributed cluster with Linux Open MPI. > > > > I found that the the process sends out some messages to other processes, > > which can not receive them. > > > > What is the possible reason ? > > > > I do not change anything of the program. > > > > Any help is really appreciated. > > > > Thanks > > > > > > > > > > > > _______________________________________________ > > users mailing list > > us...@open-mpi.org > > http://www.open-mpi.org/mailman/listinfo.cgi/users > > > > ================================================== > Open Grid Scheduler - The Official Open Source Grid Engine > http://gridscheduler.sourceforge.net/ > _______________________________________________ > users mailing list > us...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/users
