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 [email protected] 315-212-7331

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