Hello George,

Thanks for your messages. Yes i disconnect my different worlds before calling MPI_Finalize().

Bernard

George Bosilca a écrit :
I was somehow confused when I wrote my last email and I mixed up the MPI versions (thanks to Dick Treumann for gently pointing me to the truth). Before MPI 2.1, the MPI Standard was unclear how the MPI_Finalize should behave in the context of spawned or joined worlds, which make the disconnect+finalize the only safe and portable way to correctly finalize all processes connected. However, the MPI 2.1 had clarified this point, and now MPI_Finalize is collective over all connected processes (for a definition of connected processes please see the MPI 2.1 10.5 page 318).

However, if you really want to write a portable MPI application, I suggest to use the disconnect+finalize, at least until all MPI libraries available are 2.1 compliant.

Open MPI 1.3 version was supposed to be 2.1 compliant, so I guess I'll have to create a new bug report for this.

  Thanks,
    george.

On Jan 23, 2009, at 10:02 , George Bosilca wrote:

I don't know what your program is doing but I kind of guess what the  =

problem is. If you use MPI 2 dynamics to spawn or connect two  =

MPI_COMM_WORLD you have to disconnect them before calling  =

MPI_Finalize. The reason is that an MPI_Finalize do the opposite of an  =

MPI_Init, so it is MPI_COMM_WORLD based. Make sure your different  =

world are disconnected before doing the MPI_Finalize should solve the  =

problem.

  george.

On Jan 23, 2009, at 06:00 , Bernard Secher - SFME/LGLS wrote:

No i didn't run this program whith Open-MPI 1.2.X because one said  =

to me there were many changes between 1.2.X version and 1.3 version  =

about MPI_publish_name, MPI_Lookup_name (new ompi-server, ...), and  =

it was better to use 1.3 version.

Yes i am sure all processes reach MPI_Finalize() function because i  =

write message just before (it is the END_OF macro in my program),  =

and i am sure all processes are locked in MPI_Finalize() function  =

beacause i write message just after (it is the MESSAGE macro).

May be all MPI_Sends are not matched  by corresponding MPI_Recvs,...  =

It can be a possibility.

Thanks
Bernard



jody a =E9crit :
Hi Bernard

The structure looks as far as i can see.
Did it run OK on Open-MPI 1.2.X?
So are you sure all processes reach the MPI_Finalize command?
Usually MPI_Finalize only completes when all processes reach it.
I think you should also make sure that all MPI_Sends are matched by
corresponding MPI_Recvs.

Jody

On Fri, Jan 23, 2009 at 11:08 AM, Bernard Secher - SFME/LGLS
<bernard.secher@cea.fr> wrote:

Thanks Jody for your answer.

I launch 2 instances of my program on 2 processes each instance,  =

on the same
machine.
I use MPI_Publish_name, MPI_Lookup_name  to create a global  =

communicator on
the 4 processes.
Then the 4 processes exchange data.

The main program is a CORBA server. I send you this program.

Bernard

jody a =E9crit :

For instance:
- how many processes on how many machines,
- what kind of computation
- perhaps minimal code which reproduces this failing
- configuration settings, etc.
See: http://www.open-mpi.org/community/help/

Without any information except for "it doesn't work",
nobody can give you any help whatsoever.

Jody

On Fri, Jan 23, 2009 at 9:33 AM, Bernard Secher - SFME/LGLS
<bernard.secher@cea.fr> wrote:


Hello Jeff,

I don't understand what you mean by "A _detailed_ description of  =

what is
failing".
The problem is a dead lock in MPI_Finalize() function. All  =

processes are
blocked in this MPI_Finalize() function.

Bernard

Jeff Squyres a =E9crit :


Per this note on the "getting help" page, we still need the  =

following:

"A _detailed_ description of what is failing. The more details  =

that you
provide, the better. E-mails saying "My application doesn't work!"  =

will
inevitably be answered with requests for more information about  =

exactly what
doesn't work; so please include as much information detailed in  =

your initial
e-mail as possible."

Additionally:

"The best way to get help is to provide a "recipie" for  =

reproducing the
problem."

Thanks!


On Jan 22, 2009, at 8:53 AM, Bernard Secher - SFME/LGLS wrote:



Hello Tim,

I send you the information in join files.

Bernard

Tim Mattox a =E9crit :


Can you send all the information listed here:

http://www.open-mpi.org/community/help/

On Wed, Jan 21, 2009 at 8:58 AM, Bernard Secher - SFME/LGLS
<bernard.secher@cea.fr> wrote:



Hello,

I have a case wher i have a dead lock in MPI_Finalize() function  =

with
openMPI v1.3.

Can some body help me please?

Bernard



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