TERRY DONTJE <terry.don...@oracle.com> wrote: >Can you try running the benchmark with coalescing off? To do that add the following option to your mpirun line "-mca btl_openib_use_message_coalescing 0".
I've tried this: # /usr/mpi/gcc/openmpi-1.4.4/bin/mpirun -np 2 --mca btl_openib_use_message_coalescing 0 --mca btl_base_verbose 50 --mca btl_openib_verbose 1 -host cluster1,cluster2 /usr/mpi/gcc/openmpi-1.4.3/tests/osu_benchmarks-3.1.1/osu_latency And that's the result (which isn't different from the run without "--mca btl_openib_use_message_coalescing 0"): http://net.razik.de/linux/T5120/openmpi-1.4.4-verbose_no_coalescing.txt >thanks, > I thank you! Regards, Lukas
