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LAMMPs Performance Testing of iWARP: White Paper Executive Summary The Intel® iWARP Ethernet performance series of test results intends to help close the gap between real user requirements and the micro-benchmarks promoted by other RDMA vendors. Each paper in the series demonstrates the real-world performance of Intel iWARP on an industry standard application. This paper reports on LAMMPs performance testing performed by the Research Computing and Cyberinfrastructure unit of Information Technology services at Penn State.Introduction RDMA enables direct, zero-copy data transfer between RDMA-capable server adapters and application memory, removing the need in Ethernet networks for data to be copied multiple times to operating system data buffers. The mechanism is highly efficient and eliminates the associated processor-intensive context switching between kernel space and user space. HPC applications can therefore reduce latency and perform message transfer very rapidly and consistently by directly delivering data from application memory to the network. Both iWARP and InfiniBand* use RDMA and a common API for HPC applications, however iWARP enables the use of RDMA over the familiar Ethernet fabric. Because iWARP runs over Ethernet TCP/IP, it enables both application and management traffic to operate over a single wire. This paper reports on LAMMPs performance testing performed by the Research Computing and Cyberinfrastructure unit of Information Technology services at Penn State to identify how well iWARP fabrics support workloads on widely used high performance computing applications compared to InfiniBand.Read the full LAMMPs Performance Testing of iWARP white paper.
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