On Tue, 3 Apr 2018, Smith, Barry F. wrote: > Note that PETSc does one MPI_Comm_dup() for each hypre matrix. Internally > hypre does at least one MPI_Comm_create() per hypre boomerAMG solver. So even > if PETSc does not do the MPI_Comm_dup() you will still be limited due to > hypre's MPI_Comm_create. > > I will compose an email to hypre cc:ing everyone to get information from > them.
Actually I don't see any calls to MPI_Comm_dup() in hypre sources [there are stubs for it for non-mpi build] There was that call to MPI_Comm_create() in the stack trace [via hypre_BoomerAMGSetup] Satish
