Dear Andrew Burns, Thank you for your ideas. Your guess is partly correct, I am trying to merge two sets of programs into one executable and then run in mpi. As per your suggestion, I have omitted the MPI_Finalize from of one set. And also commented the MPI_Barrier in some parts. But still it is serial. For your idea: attached here Makefile.
Regards Ashfaq On Tue, Feb 3, 2015 at 6:26 PM, Burns, Andrew J CTR (US) < andrew.j.burns35....@mail.mil> wrote: > Classification: UNCLASSIFIED > Caveats: NONE > > If I could venture a guess, it sounds like you are trying to merge two > separate programs into one executable and run them in parallel > via MPI. > > The problem sounds like an issue where your program starts in parallel but > then changes back to serial while the program is still > executing. > > I can't be entirely sure without looking at the code itself. > > One guess is that MPI_Finalize is in the wrong location. Finalize should > be called to end the parallel section and move the program > back to serial. Typically this means that Finalize will be very close to > the last line of the program. > > It may also be possible that with the way your program is structured, the > effect is effectively serial since only one core is > processing at any given moment. This may be due to extensive use of > barrier or similar functions. > > Andrew Burns > Lockheed Martin > Software Engineer > 410-306-0409 > ARL DSRC > andrew.j.bur...@us.army.mil > andrew.j.burns35....@mail.mil > > -----Original Message----- > From: users [mailto:users-boun...@open-mpi.org] On Behalf Of Ralph Castain > Sent: Tuesday, February 03, 2015 9:05 AM > To: Open MPI Users > Subject: Re: [OMPI users] prob in running two mpi merged program > > I'm afraid I don't quite understand what you are saying, so let's see if I > can clarify. You have two fortran MPI programs. You start > one using "mpiexec". You then start the other one as a singleton - i.e., > you just run "myapp" without using mpiexec. The two apps are > attempting to execute an MPI_Connect/accept so they can "join". > > Is that correct? You mention MPICH in your statement about one of the > procs - are you using MPICH or Open MPI? If the latter, which > version are you using? > > Ralph > > > On Mon, Feb 2, 2015 at 11:35 PM, Muhammad Ashfaqur Rahman < > ashfaq...@gmail.com> wrote: > > > Dear All, > Take my greetings. I am new in mpi usage. I have problems in > parallel run, when two fortran mpi programs are merged to one > executable. If these two are separate, then they are running parallel. > > One program has used spmd and another one has used mpich header > directly. > > Other issue is that while trying to run the above mentioned merged > program in mpi, it's first started with separate parallel > instances of same step and then after some steps it becomes serial. > > Please help me in this regards > > Ashfaq > Ph.D Student > Dept. of Meteorology > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2015/02/26264.php > > > > > Classification: UNCLASSIFIED > Caveats: NONE > > > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2015/02/26266.php >
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