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Advanced User Support Operations: Updates and Activities

Learn about the three categories of AUS, operational activities, recent updates, and ongoing ASTA projects. Explore support for TeraGrid applications and EOT, along with staff initiatives and project advancements.

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Advanced User Support Operations: Updates and Activities

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Presentation Transcript

  1. Advanced User Support Amit Majumdar 5/7/09

  2. Outline • Three categories of AUS • Update on Operational Activities • AUS.ASTA • AUS.ASP • AUS.ASEOT

  3. Three Categories of AUS • Advanced Support for TeraGrid Applications (AUS.ASTA) • AUS staff work on a particular user’s code (usually) • Guided/initiated by the allocations process • Advanced Support for Projects (AUS.ASP) • Project initiated by AUS staff (jointly with users) – impacts many users • Advanced Support for EOT (AUS.ASEOT) • Advanced HPC/CI part of EOT

  4. Update on Operational Activities • Bi-weekly telecon among AUS POCs from every RP site • Matching of AUS staff to ASTA projects, discussion about ASP, EOT activities • Web/Tele-con among AUS technical staff • Biweekly technical tele/web-conference on ASTA and other projects - using readytalk • 13 presentation sessions (including today), 22 technical presentations

  5. ASTAs Started in October 2008 - TRAC

  6. Startup/Supplemental ASTAs

  7. ASTAs Started in January 2009 - TRAC

  8. ASTAs Started in April 2009 - TRAC Total number of active ASTAs ~40

  9. ASTA Update - PI: Durisen, IU, AstrophysicsAUS staff: Henschel, Berry (IU) • Legacy code – OpenMP parallel – benchmarked on three Altix systems (PSC, NCSA, ZIH) – different performance! • Optimized subroutines (calculates the gravitational potential) – 1.8X speedup • Simulations generate several TBs of data which is then analyzed interactively using IDL • Transferring this amount of data via traditional methods (ftp, scp, etc.) to IU is extremely time consuming and tedious • By mounting the Data Capacitor at PSC on Pople the user can write their data directly to IU and then access from servers in their department • Extensive profiling and optimization of I/O performance on local scratch vs DataCapacitor – eventually ~30% speedup in I/O • Files appear locally as they are generated by simulation

  10. ASTA Update - PI: Scheraga, Cornell, BiophysicsAUS Staff : Blood, Mahmoodi (PSC) • Identified a serial bottleneck and load imbalance problem that limited parallel scaling • Eliminated serial bottleneck and restructured code to eliminate imbalance • Resulting code performing 4 times faster for large systems • Never ending optimization • In the new code computation/communication balance is changed – further profiling ongoing using CrayPAT, TAU

  11. ASTA Update - PI: Van de Walle, UCSB, Condensed Matter PhysicsAUS Staff : Liu (TACC), Vanmoer (NCSA) • Main effort was to identify performance issues of VASP • Identified only routine that needed lower level (-O1) compilation; others used –O3 : resulted in ~10 % performance improvement • MKL on Ranger had SMP enabled with default OMP_NUM_THREADS of 4; caused overhead – fixed with proper wayness and threads • Proper setting of NPAR (determines process grouping for band diagonalization and FFT) showed 3-4 times speedup

  12. Advanced Support Projects • Two projects ongoing • Benchmarking Molecular Dynamics codes • Benchmarking Materials Science codes • Other potential ones we are looking into • Multi-core performance analysis • Usage-based perf/profiling tools

  13. Comparison of MD Benchmark on TeraGrid Machines at Different Parallel Efficiencies

  14. Advanced Support EOT • Advanced HPC classes at various RP sites • TG09 • AUS staff participating in organizing TG09; reviewing papers • AUS staff will be presenting papers at TG09; presenting tutorials • Joint US-AUS-XS working group meeting at TG09

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