Josh Aune wrote:
I am writing up some interconnect/network debugging software that is centered around ompi. What is the best set of functions to use to get the best bandwidth and latency numbers for openmpi and why? I've been
You mean MPI functions or internal ompi functions ? For MPI functions, it depends of what you are looking for. Send/recv is fine but it does not show the overlap capability. You would need to do something smarter with Isend/Irecv/Wait for that (Sandia has a nice bench that they should release soon). You may also want to measure the penalty for unexpected messages, the host CPU overhead and the ability to progress.
All of these metrics are measured by existing benchmarks, do you want to write one that covers everything or something like IMB ?
Patrick -- Patrick Geoffray Myricom, Inc. http://www.myri.com
