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Support for Global Cloud Resolving Model Simulations VACET All-Hands Meeting IEEE Vis 2008

Support for Global Cloud Resolving Model Simulations VACET All-Hands Meeting IEEE Vis 2008. Support for Global Cloud Resolving Model Simulations VACET All-Hands Meeting IEEE Vis 2008. PRABHAT. GCRM. SciDAC/INCITE PI: Dave Randall (CSU) 2008 INCITE award at NERSC

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Support for Global Cloud Resolving Model Simulations VACET All-Hands Meeting IEEE Vis 2008

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  1. Support for Global Cloud Resolving Model Simulations VACET All-Hands Meeting IEEE Vis 2008

  2. Support for Global Cloud Resolving Model Simulations VACET All-Hands Meeting IEEE Vis 2008 PRABHAT

  3. GCRM • SciDAC/INCITE • PI: Dave Randall (CSU) • 2008 INCITE award at NERSC • Multi-institution collaboration • CSU researchers developing the climate simulation • PNNL researchers developing the Data API • VACET researchers helping w/ Data model, Parallel IO and Vis

  4. GCRM simulations • Global atmospheric circulation model • non-hydrostatic dynamical core • cloud microphysics, turbulence, radiation • coupled to land-surface model • 3km grid-cell spacing • Planned runs on 20K+ franklin cores • Planned 1:1 simulated:wall_clock time • Data throughput • ~1TB/hr • 2GB/s aggregate IO performance requirement • ~500M cells*100 layers, 50 variables

  5. What problems are we addressing? • Identify a data model for GCRM code • Enable simulation code to do efficient parallel IO • Visualization and Analysis on extremely large icosahedral meshes

  6. Accomplishments: Data Model • 1st Phase: NetCDF-3 • metadata conventions • Icosahedral mesh variables/layout • cell/corner/edge/face centered • satisfy VisIt plugin requirements • 2nd Phase NetCDF-4 (HDF5)

  7. Accomplishments: Parallel IO • Need sustained 2+GB/s collective IO to single shared file • Current franklin performance ~0.3-1.2 GB/s (for single file) • Large number of IOR tests examining factors • IO patterns • lustre striping • blocking/transfer sizes • #IO nodes, #OSTs

  8. Parallel IO (contd..) • Issues identified with Cray's mpich implementation • Not sufficiently aware of OST striping • Modifying HDF5 to align/pad to OST stripes • Current best strategy is to use • 2-phase IO (use aggregator nodes) • #IO nodes = #OSTs • Match file transfer size to stripe width • Simulate ‘file-per-process’ IO pattern

  9. Accomplishments: Vis • VisIt plugin developed to load icosahedral NetCDF mesh data • Preliminary custom visualizations rendered • Online tutorials and startup instructions published at: http://vis.lbl.gov/~prabhat/Incite19/

  10. Future Plans • Further work w/ Cray on optimizing mpi-io • Finalize data model • cell/corner/edge/face centered data • validate NetCDF-4 • VisIt plugin enhancements • parallelization • incorporate morton-ordering

  11. Acknowledgements • Colorado State Univ • Dave Randall, Ross Heikes • PNNL • Karen Schuchardt, Bruce Palmer, Annette Koonz • LBNL • Janet Jacobsen, Wes Bethel • Mark Howison • Katie Antypas, John Shalf, Shane Canon • VisIt team

  12. VisIt Update (Hank’s part) • Project is doing very well • There is an upcoming slide on partnering • Much more like an open source project • SVN repo at LBL through SciDAC Outreach Center • Mailing lists at ORNL • ~200 people on users lists • Visitusers.org Wiki • Wiki for developers and users • Tutorials (at SciDAC conf, Snowbird, PPPL)

  13. Likely upcoming features in the next year • SciDAC stuff: • Poincare plots • Integration of FastBit • VisTrails (?) • Non-SciDAC stuff: • Qt4 • Parallel Python • Hopefully more for in-situ, multi-res, and time-varying data. • + a lot more…

  14. VisIt has a rapidly growing developer community. • + more partnerships coming soon (NSF?) • + contributions from people not in the repository LBL Institutional Gunther Weber Prabhat INL Institutional Jim Galbraith SciDAC/LBL Gunther Weber Prabhat SciDAC/UUtah Josh Stratton UNH: Research Tom Fogal SciDAC/UCDavis Christoph Garth Oliver Ruebel Eduard Dienes ITT (Industry) Matt Fago ANL Institutional Randy Hudson ASC / LLNL Eric Brugger (PL) Kathleen Bonnell Hank Childs Cyrus Harrison Mark Miller Brad Whitlock AWE Matt Wheeler Paul Selby SciDAC/ORNL Sean Ahern Jeremy Meredith David Pugmire UCDavis: Research John Anderson Oil $ to LLNL Eric Brugger ORNL Institutional Sean Ahern Jamison Daniel Jeremy Meredith David Pugmire CEA Fabien Vivodtzev SciDAC/LLNL Hank Childs Brad Whitlock GNEP/LLNL David Bremer Hank Childs LDRD/LLNL Daniel Laney Hank Childs

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