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OLS Field Name OLS Field Data
Main Title Computational Aspects of the Air Quality Forecasting Version of CMAQ (Community Multiscale Air Quality) (CMAQ-F).
Author Wong, D. C. ; Young, J. O. ;
CORP Author Environmental Protection Agency, Research Triangle Park, NC. Office of Air Quality Planning and Standards. ;Lockheed Martin, Research Triangle Park, NC.
Publisher 2004
Year Published 2004
Report Number EPA/600/A-04/106 ;NERL-RTP-AMD-04-081;
Stock Number PB2005-101222
Additional Subjects Computations ; Air quality ; Input output processing ; Forecasting ; Computer hardware ; Parallel processing ;
Holdings
Library Call Number Additional Info Location Last
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Checkout
Status
NTIS  PB2005-101222 Most EPA libraries have a fiche copy filed under the call number shown. Check with individual libraries about paper copy. NTIS 05/03/2005
Collation one CD-ROM contains 4 page document
Abstract
The air quality forecast version of the Community Modeling Air Quality (CMAQ) model (CMAQ-F) was developed from the public release version of CMAQ and is running operationally at the National Weather Service's National Centers for Environmental Prediction (NCEP). Most of the modifications to CMAQ focus on tailoring the model's performance to the operational hardware and the parallel computing environment at NCEP and effectively managing the parallel input and output (I/O) processes to achieve scalability. This has been accomplished by asynchronously overlapping computation with I/O writing to disk (WTD) by a dedicated processor. In this paper, we describe two different ways of placing the WTD processor. Benchmark results with regards to the WTD processor placement and an extension to more than one WTD processor are presented. In addition, a benchmark comparison between the I/O implementation in the CMAQ-F and the community version of CMAQ is provided.