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In this paper, we provide an overview and describe the components and performance of an HPC solution for Linux® on POWER™ using InfiniBand as the cluster interconnect. The paper contains performance results for several communication benchmarks running on IBM System p5™ servers with the IBM Host Channel Adapter driving InfiniBand switches. We provide some guidelines for end users on the various environmental settings that can be tuned to improve the performance of applications. The specific measurements are for the MPI and TCP/IP communication protocols. The MPI measurements were done using a simple PingPong based benchmark which we call Spark. For TCP/IP, we use an internal benchmark similar to the Netperf public-domain benchmark. Selected results for some industry standard benchmarks are also included.
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