AMMPI - Summary Active Messages–2 (AM) implementation over MPI version 1.1 –Porting is trivial - works on virtually any platform that has MPI 1.1 –Often provides very high performance – vendors tune their MPI well –Linux/Myrinet, MPICH, IBM SP3, Origin 2000, Cray T3E, many others… Based on the AMUDP code base, same cool features –Robust, clear error reporting for ease of debugging –SPMD bootstrapping library (but we use site-specific mpirun) –Network performance/utilization monitoring API MPI Interface –Non-blocking sends, non-blocking receives –Uses MPI communicators to co-exist happily with other MPI-aware layers

GoodBad AMMPI – Latency Performance minimal small message, round-trip time measured from application

BadGood AMMPI – Bandwidth Performance with 64 KB messages == MAX_MEDIUM == MAX_LONG

AMMPI – Raw Performance Data