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Advanced User Support

Advanced User Support. Amit Majumdar 2/25/10. Outline. Three categories of AUS Operational Activities AUS.ASTA ASTA examples AUS.ASP AUS.EOT. Three Categories of AUS. A dvanced S upport for T eraGrid A pplications ( AUS . ASTA )

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Advanced User Support

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  1. Advanced User Support Amit Majumdar 2/25/10

  2. Outline • Three categories of AUS • Operational Activities • AUS.ASTA • ASTA examples • AUS.ASP • AUS.EOT

  3. Three Categories of AUS • Advanced Support for TeraGrid Applications (AUS.ASTA) • AUS staff work on a particular user’s code (some community codes) • Guided/initiated by the allocations process • Advanced Support for Projects (AUS.ASP) • Project initiated by AUS staff (jointly with users) – impacts many users • Optimally install software, maintain, train users • Advanced Support for EOT (AUS.ASEOT) • Advanced HPC/CI trainings • Participate in workshops, tutorials (TGXY, PetaScale, SCXY) • Interaction with other CI programs etc.

  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 • Program plans, annual reports etc. • Web/Tele-con among AUS technical staff • Biweekly technical tele/web-conference on ASTA and other projects - using readytalk • Since we started (early October, 2008) 30 tele/web-con sessions and 43 technical presentations (including one today) • Presentations by Kelly, Chris, Nancy – there are joint ASTA projects with Viz area and SGW area

  5. Table 5-4 List of 2009 ASTA Projects.

  6. ASTA updates for PI. Hu from TACC • I/O – small test case: original version READ TIME = 4612 sec SOLVE TIME = exceeds CPU time version 1 READ TIME = 1095 sec SOLVE TIME = 2963 sec version 2 READ TIME = 360 sec SOLVE TIME = 2941 sec • Large test case: original version – never completed version 1 – never completed version 2 – 5700 sec

  7. “Computational scientists, Gabriele Jost and BD Kim, from TACC, have made tremendous contribution to my porting effort on Ranger and in optimizing the code as a part of the ASTA. Gabriele’s work has resulted in order of magnitude improvement in the I/O part of the code and, as a result, now allow us to make production runs on 4096 cores of Ranger. And recently we are enabled to run 16384 cores on Ranger as well. Without this heroic effort our work would come to a stop. We are now looking forward to do new science.”Prof. C.Y. Hu, Cal State University, Long Beach.

  8. ASTA updates for PI Parrish from NCSA • Darren Adams (NCSA) implementing new I/O approach in Athena code – astrophysical gas dynamics, Princeton • New approach is to use HDF5 directly in conjunction with a manually written XDMF XML desc file for viz • HDF5 file is collectively accessed by all MPI tasks • Eliminates the need for post processing of file-per-process collection • Was challenging as code ran on higher core counts • First version implemented – being tested by viz experts • Next focus on refining HDF call for performance • Athena team interested to incorporate in public version

  9. ASTA Update for SCEC and Jansen from NICS • Kwai (NICS) working with Yifeng (SDSC) profiled SCEC code running on 96K cores • system experts • several dedicated reservations • jobs finished – produced useful profiling info • quantify comm, comp, I/O parts of the code • Glenn (NICS) worked with PI Jansen • assisted in scaling study : 4K – 96K cores • excellent scaling up to 32K, but big drop at 64K – investigation ongoing

  10. Advanced Support Projects • Four projects – three ongoing from last year • Benchmarking Molecular Dynamics codes (SDSC, PSC) – second phase ongoing • Benchmarking Materials Science codes (PSC, TACC, LONI, NCSA, NICS) – second phase ongoing • Hybrid Programming model for multi-core (TACC, SDSC, PSC, NICS) jointly with XS-WG – continuing • Benchmark of kernels written in PGAS languages – TACC initiated (others can participate as it matures)

  11. ASP Benchmark Webpage • Doc group did the LifeRay transition for this page • New material being added to the benchmark page: • compile, run script for AMBER and NAMD for many machines • VASP 4.2 benchmark results

  12. AUS - EOT • AUS staff involved in TG10 planning, reviewing papers • AUS staff involved in organizing the PetaScale-I/O workshop at Austin, March 22-24th – 4th in a series of annual PetaScale theme workshops (PetaApps, Tools, Fault tolerance) • AUS staff reviews TRAC proposals – smaller size ones

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