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MPI and OFA Divergent interests?

MPI and OFA Divergent interests?. Dan Caldwell, VP WW Channel Sales Scali, Inc. The role of OFA in HPC. The traditional role of Open Fabrics focuses on cables that connect motherboards, switches, and storage in clusters

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MPI and OFA Divergent interests?

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  1. MPI and OFADivergent interests? Dan Caldwell, VP WW Channel Sales Scali, Inc

  2. The role of OFA in HPC • The traditional role of Open Fabrics focuses on cables that connect motherboards, switches, and storage in clusters • Growth of processors in HPC expected to be 30% in 2010 (per IDC), and number of cores per processor is 55% (estimate) and increasing • Therefore the bulk of the “HPC Interconnect Fabric” is moving from cables to the server motherboard and the various local buses OFA Presentation

  3. MPI Performance in HPC systems • Scali has always been the performance MPI leader • http://www.supercomputingonline.com/article.php?sid=15357 • However, we suggest that OFA adopt a recommended performance measurement methodology • Productivity, or ‘jobs per day’, on a cluster • How do you know how well OFA is doing? • OFA must examine the performance within a multi-core node • A 16 core “Personal Supercomputer” will still run legacy MPI applications OFA Presentation

  4. Single Node, 8 cores, osu_bw, 8 byte, Intel Xeon 3.00GHz (X5365) OFA Presentation

  5. MPI enables other HPC functionality • Infiniband Trunking • Combining IB channels for greater throughput • Done for Sun / Tsukuba University in Japan • Suspend / Resume and Checkpoint – Restart • Generic functionality - not application specific • Demonstrated job migration with HPC4U in Brussels, February 11, 2008 • And…. MPI based Power Management • Today – AMD / Barcelona only OFA Presentation

  6. ”Waiting as fast as it can” (CPU spinning) – examples (AMD Barcelona Quad Core): Power Saving Potential Zone Power Saving Potential Zone Considering 20 microseconds to change power states in an Quad core Opteron, latency above 10 milliseconds in an MPI collectivecan trigger a ”throttle down”. In a call with a 10 millisecondlatency, 20 microseconds to throttle down plus 200 to re-establishfull speed would use only 2.5% of the time of the call. OFA Presentation

  7. Real World Initial Tests - SPEC MPI2007 OFA Presentation

  8. Conclusions • MPI and OFA need to co-exist, but we both need to expand our reach in HPC • Open Fabrics needs to embrace new functionality, performance metrics, and definitions of ‘fabric’ • Power savings, user-model (core affinity policies), best practices in interconnect design, and emphasis on continued performance across the entire HPC system is critical to the relevancy of OFA. OFA Presentation

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