Hello! What param can i tune to increase perfomance(scalability) for my app (all to all pattern with message size = constant/nnodes)? I can read this faq for mpi, but is it correct for shmem? I have 2 programm doing the same thing(with same input) each node send messages(message size = constant/nnodes) to random set of nodes (but the same set in prg1 and prg2): * with mpi_isend, mpi_irecv and mpi_waitall * with shmem_put and shmem_barrier_all on 1 2 4 8 16 32 nodes thay have same perfomance(scalabilyty) on 64 128 256 nodes shmem programm stop scaling but over 512 nodes shmem programm gets much better perfomance than mpi 1prg 2prg perf unit perf unit 1 30 30 2 50 53 4 75 85 8 110 130 16 180 200 32 310 350 64 500 400 (strange) 128 830 400 (strange) 256 1350 600 (strange) 512 1770 2350 (wow!)
In scalabel shmem(ompi 1.6.5?) I get the same scalability in this programms.
