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iWarp-Based Remote Interactive Scientific Visualization at CENIC 2008

Explore the use of iWarp technology in remote visualization at CENIC 2008, leveraging 10-gigabit network infrastructure to extend access, with a focus on high-performance rendering and data exploration.

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iWarp-Based Remote Interactive Scientific Visualization at CENIC 2008

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  1. iWarp Based Remote Interactive Scientific VisualizationCENIC 2008Oakland, CA Scott A. Friedman UCLA Academic Technology Services Research Computing Technologies Group

  2. Our Challenge • Applications which make use of • 10 gigabit network infrastructure • iWarp, leveraging our existing IB code • Extend access to our visualization cluster • Remote sites around UCLA campus • Remote sites around UC system • Remote sites beyond… CENIC 08

  3. Our Visualization Cluster • Hydra - Infiniband based • 24 rendering nodes (2x nvidia G70) • 1 high definition display node • 3 visualization center projection nodes • 1 remote visualization bridge node • Research System - primarily • High performance interactive rendering (60Hz) • Load balanced rendering • Spatio-temporal data exploration and discovery • System requires both low latency and high bandwidth CENIC 08

  4. Remote Visualization Bridge Node • Bridges from IB to iWarp/10G ethernet • Appears like a display to cluster • No change to existing rendering system • Pixel data arrives over IB, which • is sent over iWarp to a remote display node • uses same RDMA protocol • Same buffer used for receives and sends • Very simple in principle - sort of… • is pipelined along the entire path • pipeline chunk size is optimized offline CENIC 08

  5. Simple Diagram scinet remote HD node iWarp nlr local HD node input IB pixel data cenic visualization cluster Acts like a display to the cluster ucla bridge node IB iWarp CENIC 08

  6. What are we transmitting • High definition uncompressed ‘video’ stream • 60Hz at 1920x1080 ~ 396MB/s (3Gbps) • One frame every 16.6ms • Achieved three simultaneous streams at UCLA • Using a single bridge node • Just over 9.2Gbps over campus backbone • Actual visualization • Demo is a particle DLA simulation • Diffusion limited aggregation - physical chemistry • N-body simulations CENIC 08

  7. Diffusion limited aggregation CENIC 08

  8. Continuing Work • Local latency is manageable • ~60usec around campus • Longer latencies / distances • UCLA to UC Davis ~20ms rtt (CENIC) • UCLA to SC07 (Reno, NV) ~14ms rtt (CENIC/NLR) • How much can we tolerate - factor of interactivity • Jitter can be an issue, difficult to buffer, typically just toss data • Challenges • Proper application data pipelining helps hide latency • Buffering is not really an option due to interaction • Packet loss is a killer - some kind of provisioning desired/needed • Remote DMA is not amenable to unreliable transmission • Reliable hybrid application protocol likely best solution CENIC 08

  9. Thank you • UCLA • Mike Van Norman, Chris Thomas • UC Davis • Rodger Hess, Kevin Kawaguchi • SDSC • Tom Hutton, Matt Kullberg, Susan Rathburn • CENIC • Chris Costa • Open Grid Computing, Chelsio • Steve Wise, Felix Marti CENIC 08

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