idc hpc user forum weather climate panel september 2009 broomfield co
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IDC HPC USER FORUM Weather & Climate PANEL September 2009 Broomfield, CO. Panel questions: 1 response per question Limit length to 1 slide. Panel Format. <insert panel format here> Sequence – Alphabetical Few bullet points for each question, each participant can address/supplement it

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idc hpc user forum weather climate panel september 2009 broomfield co

IDC HPC USER FORUM Weather & Climate PANELSeptember 2009Broomfield, CO

Panel questions:

1 response per question

Limit length to 1 slide

panel format
Panel Format
  • <insert panel format here>
  • Sequence – Alphabetical
  • Few bullet points for each question, each participant can address/supplement it
  • After each panel member has finished it, we move on to the next question
  • Moderators can adjust depending on discussions and time constraints
panel members
Panel Members
  • <insert panel moderators here>
  • Steve Finn & Sharan Kalwani
  • <insert panel participants & affiliation here>
q1 relative importance of data resolution micro physics
Q1. Relative Importance of data/resolution/micro-physics!
  • Please quantify the relative importance of  improvements in observational data,  grid resolution, cloud micro-physics for future forecast accuracy ?
    • For prediction
      • Observations and understanding of observations
        • Data assimilation
        • Ensembles
      • Physics
        • Scale appropriate
        • Sensitivities
        • Superparameterizations
      • Resolution
        • Explicitly resolve scales
        • Convergence studies, feed back to prediction
q2 adaptive mesh or embedded grids their impact
Q2. Adaptive Mesh or Embedded Grids: their impact…
  • Please discuss the use of Adaptive Mesh or embedded grids ( urban area, terrain impact on advection..) and how would future increased use of this, impact system requirements such as  system interconnects?
    • Nesting
      • Domains interact sequential
      • Scatter-gather 3D fields between domains
    • Spatial refinement
      • In place, adding cells
      • Temporal refinement (future)
      • Adaptivity (future)
    • Coupling
      • Load balancing, bandwidth
q3 ratio of date to compute background
Q3. Ratio of Date to Compute: Background…
  • What are your Bytes per Flop for future requirements?
    • Assuming the question means “bytes of main memory per sustained flop/s” (D. H. Bailey)
    • Current – lots of headroom

~2000 ops per cell per second

~800 bytes (4 byte floats) per cell

= 0.4 bytes per op

    • Future
      • Resolution follows 3/4 rule (2/3 in practice)
      • Adding physics or chemistry should not upset this ratio

* This is a relatively  *low* ratio compared to some other benchmarks? Geerd Hoffman of DW said 4Bytes/Flop @ the Oct 2007 HPC User Forum in Stuttgart)

q4 open source codes in the community
Q4. Open Source codes in the community…
  • What is the  Importance and impact of open source / community code  applications such as CCSM, WRF,….?
    • Common modeling tool to foster interaction, outreach, and ultimately advancement of the science
    • Relevant HPC application benchmarks
q5 data and collaboration formats future needs
Q5. Data and collaboration, formats, future needs…
  • What is the level of collaboration and standardization of data management, observational & results data bases: such as use  of common file formats, web based data, etc.  What is needed in the future?
    • Scientific and technical interoperability for multi-model simulation systems
    • Metadata formalisms, conventions, infrastructure:
      • Earth System Curator (www.earthsystemcurator.org)
      • Earth System Grid (www.earthsystemgrid.org)
q6 ensemble model your experiences
Q6. Ensemble model: your experiences…
  • Has the use of ensemble model had any positive or negative impact in reducing the code scaling requirements?
    • Ensembles have a positive effect on scaling because they are trivially scalable
q7 obligatory question no pun intended cloud computing your views unfiltered
Q7. Obligatory Question: (no pun intended!)Cloud computing: your views (unfiltered)…
  • What  is your current / future interest in grid or cloud computing ?
    • Computational grids are not feasible for tightly coupled parallel applications
    • Reproducibility across platforms also an issue
    • Data and observing grids are useful
    • WRF is used in LEAD (portal.leadproject.org)
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