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

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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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