Hi there, I tried to understand the behavior Thatyene said and I think is a
bug in open mpi implementation.
I do not know what exactly is happening because I am not an expert in ompi
code, but I could see that when one process define its color as *
MPI_UNDEFINED*, one of the processes on the inter-communicator blocks in
the call to the function bellow:
/* Step 3: set up the communicator */
/* --------------------------------------------------------- */
/* Create the communicator finally */
rc = ompi_comm_set ( &newcomp, /* new comm */
comm, /* old comm */
my_size, /* local_size */
lranks, /* local_ranks */
my_rsize, /* remote_size */
rranks, /* remote_ranks */
NULL, /* attrs */
comm->error_handler,/* error handler */
(pass_on_topo)?
(mca_base_component_t *)comm->c_topo_component:
NULL, /* topo component */
NULL, /* local group */
NULL /* remote group */
);
This function is called inside *ompi_comm_split*, in the file *
ompi/communicator/comm.c*
*
*
Is there a solution for this problem in some revision? I insist in this
problem because I need to use this function for a similar purpose.
Any idea?
On Wed, Jan 25, 2012 at 4:50 PM, Thatyene Louise Alves de Souza Ramos <
thaty...@gmail.com> wrote:
> It seems the split is blocking when must return MPI_COMM_NULL, in the case
> I have one process with a color that does not exist in the other group or
> with the color = MPI_UNDEFINED.
>
> On Wed, Jan 25, 2012 at 4:28 PM, Rodrigo Oliveira <
> rsilva.olive...@gmail.com> wrote:
>
>> Hi Thatyene,
>>
>> I took a look in your code and it seems to be logically correct. Maybe
>> there is some problem when you call the split function having one client
>> process with color = MPI_UNDEFINED. I understood you are trying to isolate
>> one of the client process to do something applicable only to it, am I
>> wrong? According to open mpi documentation, this function can be used to do
>> that, but it is not working. Anyone have any idea about what can be?
>>
>> Best regards
>>
>> Rodrigo Oliveira
>>
>>
> _______________________________________________
> users mailing list
> us...@open-mpi.org
> http://www.open-mpi.org/mailman/listinfo.cgi/users
>
