[OMPI users] OS X, OpenMPI 1.1: An error occurred in MPI_Allreduce on communicator MPI_COMM_WORLD

Hi All, when the nodes belong to different subnets the following error messages pop up: [powerbook.2-net:20826] *** An error occurred in MPI_Allreduce [powerbook.2-net:20826] *** on communicator MPI_COMM_WORLD [powerbook.2-net:20826] *** MPI_ERR_INTERN: internal error [powerbook.2-net:20826] **

Re: [OMPI users] OS X, OpenMPI 1.1: An error occurred in MPI_Allreduce on communicator MPI_COMM_WORLD

A few clarifying questions: What is your netmask on these hosts? Where is the MPI_ALLREDUCE in your app -- right away, or somewhere deep within the application? Can you replicate this with a simple MPI application that essentially calls MPI_INIT, MPI_ALLREDUCE, and MPI_FINALIZE? Can you replica