In this video from the HPC Advisory Council Spain Conference, Martin Hilgeman from Dell presents: Power Savings – the Quest for Green MPI.
This presentation investigates whether power savings on the processor and system level can be obtained while an MPI rank is waiting (blocking) for incoming data. The author has written a transparent library that intercepts MPI call and puts processor cores into a lower power state when applicable. Measurements for both MPI synthetic benchmarks and real applications will be discussed, as well as implementation details. A novel approach for efficient MPI communication can be of great value fro large supercomputing facilities holding thousands of compute cores.