Classification: UNCLASSIFIED Caveats: NONE The placing of clminitialize and clmstop feel a little awkward, but it doesn't look like they would break the program. If you were calling MPI_Init more than once it would throw an error and if Finalize were called early in clmstop the only serial section would be the deallocation.
One other thought is to ensure that you are properly launching the program as
multicore.
The command should be similar to as follows (where NPROCS is the number of
cores being used):
mpirun -n NPROCS ./program
If you were to launch the program with simply "./program" it would run as
serial. It would also run as serial if you were to call
"mpirun ./program" since no number of processes are specified.
If the program is properly launched in parallel and then converts to serial,
you should be able to track down the location where
this happens by inserting some core polling similar to the following pseudocode:
for (i = 0; i < numprocs; ++i)
{
if (i = coreid)
{
print("core ", id, " out of ", numprocs)
}
MPI_Barrier()
}
You will want to check all of the calls inside the main loop to ensure that
none of them call finalize.
-Andrew Burns
-----Original Message-----
From: users [mailto:users-boun...@open-mpi.org] On Behalf Of Muhammad Ashfaqur
Rahman
Sent: Friday, February 06, 2015 9:50 AM
To: Open MPI Users
Subject: Re: [OMPI users] prob in running two mpi merged program (UNCLASSIFIED)
Dear Andrew Burns,
Many thanks for your correct understanding and descriptive suggestion.
I have now changed the FLAGS of one program for not to take any MPI tags, i.e.,
switched off MPI. And then for the another set kept
open for MPI options.
After that call the MPI_Initialize to the beginning of Main program (aadmn.F
here) and call MPI_Finalize containing program
(clmstop.F90 here) at the end part.
After compilation it is still serial.
I have attached here the FILES containing MPI calling and Makefile for your
kind consideration.
Regards
Ashfaq
On Thu, Feb 5, 2015 at 8:25 PM, Burns, Andrew J CTR (US)
<andrew.j.burns35....@mail.mil> wrote:
Classification: UNCLASSIFIED
Caveats: NONE
Okay, I think I may get what's going on. I think you're calling one mpi
capable program from within another mpi program.
What you
have to do is assume that the program that is being called already had
MPI_Init called and that MPI_Finalize will be called
after
the program returns.
Example (pseudocode for brevity):
int main()
{
MPI_Init();
int x;
int p2result = Program2(x, comm);
MPI_Bcast(p2result, comm);
MPI_Finalize();
}
int Program2(int x, MPI_Comm comm)
{
int returnval;
MPI_AllReduce(&returnval, x, comm);
return returnval;
}
If the second program were to be:
int Program2(int x, MPI_Comm comm)
{
MPI_Init();
int returnval;
MPI_AllReduce(&returnval, x, comm);
return returnval;
MPI_Finalize()
}
The program would return to serial when MPI_Finalize is first called,
potentially throwing several errors.
-Andrew Burns
-----Original Message-----
From: users [mailto:users-boun...@open-mpi.org] On Behalf Of Muhammad
Ashfaqur Rahman
Sent: Wednesday, February 04, 2015 3:42 PM
To: Open MPI Users
Subject: Re: [OMPI users] prob in running two mpi merged program
(UNCLASSIFIED)
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
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