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An Approach to Enhance Pnetcdf Performance in Environmental Modeling Applications : Volume 8, Issue 4 (08/04/2015)

By Wong, D. C.

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Book Id: WPLBN0003982224
Format Type: PDF Article :
File Size: Pages 14
Reproduction Date: 2015

Title: An Approach to Enhance Pnetcdf Performance in Environmental Modeling Applications : Volume 8, Issue 4 (08/04/2015)  
Author: Wong, D. C.
Volume: Vol. 8, Issue 4
Language: English
Subject: Science, Geoscientific, Model
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Copernicus GmbH
Historic
Publication Date:
2015
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications

Citation

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Yang, C. E., Fu, J. S., Wong, K., Wong, D. C., & Gao, Y. (2015). An Approach to Enhance Pnetcdf Performance in Environmental Modeling Applications : Volume 8, Issue 4 (08/04/2015). Retrieved from http://www.ebooklibrary.org/


Description
Description: U.S. Environmental Protection Agency, Research Triangle Park, NC, USA. Data intensive simulations are often limited by their I/O (input/output) performance, and novel techniques need to be developed in order to overcome this limitation. The software package pnetCDF (parallel network Common Data Form), which works with parallel file systems, was developed to address this issue by providing parallel I/O capability. This study examines the performance of an application-level data aggregation approach which performs data aggregation along either row or column dimension of MPI (Message Passing Interface) processes on a spatially decomposed domain, and then applies the pnetCDF parallel I/O paradigm. The test was done with three different domain sizes which represent small, moderately large, and large data domains, using a small-scale Community Multiscale Air Quality model (CMAQ) mock-up code. The examination includes comparing I/O performance with traditional serial I/O technique, straight application of pnetCDF, and the data aggregation along row and column dimension before applying pnetCDF. After the comparison, optimal I/O configurations of this application-level data aggregation approach were quantified. Data aggregation along the row dimension (pnetCDFcr) works better than along the column dimension (pnetCDFcc) although it may perform slightly worse than the straight pnetCDF method with a small number of processors. When the number of processors becomes larger, pnetCDFcr outperforms pnetCDF significantly. If the number of processors keeps increasing, pnetCDF reaches a point where the performance is even worse than the serial I/O technique. This new technique has also been tested for a real application where it performs two times better than the straight pnetCDF paradigm.

Summary
An approach to enhance pnetCDF performance in environmental modeling applications

Excerpt
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