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High End Computing (HEC) systems are being deployed with eight to sixteen compute cores, with 64 to 128 cores/node being envisioned for exascale systems. MVAPICH2 is a popular implementation of MPI-2 specifically designed and optimized for InfiniBand, iWARP and RDMA over Converged Ethernet (RoCE). MVAPICH2 is based on MPICH2 from ANL. Recently MPICH2 has been redesigned with an effort to optimize intra-node communication for future many-core systems. The new communication layer in MPICH2 is called Nemesis, which is very well optimized for shared memory message passing, with a modular design for various high-performance interconnects.
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