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Computational Aspects of the Air Quality Forecasting version of CMAQ (CMAQ-F)

David C. Wong and Jeffrey O. Young 3rd Annual CMAS Models-3 conference October 18-20, 2004. Computational Aspects of the Air Quality Forecasting version of CMAQ (CMAQ-F). Differences in CMAQ & CMAQ-F. SPMD vs MIMD programming paradiagm IO design. IO processor placement.

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Computational Aspects of the Air Quality Forecasting version of CMAQ (CMAQ-F)

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  1. David C. Wong and Jeffrey O. Young 3rd Annual CMAS Models-3 conference October 18-20, 2004 Computational Aspects of the Air Quality Forecasting version of CMAQ(CMAQ-F)

  2. Differences in CMAQ & CMAQ-F • SPMD vs MIMD programming paradiagm • IO design

  3. IO processor placement

  4. IO processor placement con't

  5. Objectives • Does IO processor placement affect the performance? • Will more than one dedicated IO processors render better performance? • Is dedicated IO process scheme better than standard scheme which is used in CMAQ?

  6. 3-hr simulation without aerosol

  7. 12-hr simulation with aerosol

  8. 12-hr simulation with aerosol con't

  9. 12-hr simulation with aerosol con't

  10. 12-hr simulation with aerosol con't

  11. Conclusions & future work • Placing the IO processor at the beginning or the end of the allocated processor group has different performance for CMAQ and CMAQ-F. • One dedicated processor is good for current CMAQ-F. • The dedicated WTD scheme is not superior to standard scheme in performance. • In AQF, load balance is an issue. • The study will be conducted on Linux clusters.

  12. Min & Max exe time (35 & 65 procs)

  13. Min & max exec time of HDIFF

  14. HDIFF code

  15. Improved HDIFF code

  16. Min & max exec time of improved HDIFF

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