Jason, how many Ethernet interfaces are there ? if several, can you try again with one only mpirun --mca btl_tcp_if_include eth0 ...
Cheers, Gilles On Tuesday, March 8, 2016, Jackson, Gary L. <gary.jack...@jhuapl.edu> wrote: > > I've built OpenMPI 1.10.1 on Amazon EC2. Using NetPIPE, I'm seeing about > half the performance for MPI over TCP as I do with raw TCP. Before I start > digging in to this more deeply, does anyone know what might cause that? > > For what it's worth, I see the same issues with MPICH, but I do not see it > with Intel MPI. > > -- > Gary Jackson > >
