[mpich-discuss] running out of communicators

[Jim Dinan]

Hi Ryan,

Every time you call MPI_Comm_dup a new communicator is created.  Are you 
ever freeing these, using MPI_Comm_free?

Also, what are you trying to achieve by using multiple communicators, 
and why does it require so many?

Best,
  ~Jim.

On 3/19/13 7:57 PM, Ryan Crocker wrote:
> I realized i forgot to attach the error:
>
> Fatal error in PMPI_Comm_dup: Other MPI error, error stack:
> PMPI_Comm_dup(176)............: MPI_Comm_dup(comm=0x84000000, new_comm=0x7fff5fbfe9a4) failed
> PMPI_Comm_dup(161)............:
> MPIR_Comm_dup_impl(55)........:
> MPIR_Comm_copy(967)...........:
> MPIR_Get_contextid(521).......:
> MPIR_Get_contextid_sparse(752): Too many communicators
>
> Hi all,
>
> So i can't seem to find the answer to this question.  I keep getting the failure "Too many communicators".  Could someone explain what calls "use up" communicators, and could i be calling/using more than the default total?.  I'm trying to debug my code so i can free up the communicators and not just repeatedly create them.  I'm a bit perplexed with this, probably a lack of  in depth knowledge, but i only run any of my MPI initializations one time then all my calls with mpi are either sums, max, min, allreduce, alltoall.
>
> thanks
>
> Ryan Crocker
> University of Vermont, School of Engineering
> Mechanical Engineering Department
> rcrocker at uvm.edu
> 315-212-7331
>
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