气候变化领域集成服务门户(CCPortal): Application of a hybrid MPI/OpenMP approach for parallel groundwater model calibration using multi-core computers

CCPortal

DOI	10.1016/j.cageo.2010.04.013
	Application of a hybrid MPI/OpenMP approach for parallel groundwater model calibration using multi-core computers
	Tang, Guoping; D'Azevedo, Eduardo F.; Zhang, Fan; Parker, Jack C.; Watson, David B.; Jardine, Philip M.
通讯作者	Tang, GP (通讯作者)
发表日期	2010
ISSN	0098-3004
EISSN	1873-7803
起始页码	1451
结束页码	1460
卷号	36 期号:11
英文摘要	Calibration of groundwater models involves hundreds to thousands of forward solutions each of which may solve many transient coupled nonlinear partial differential equations resulting in a computationally intensive problem We describe a hybrid MPI/OpenMP approach to exploit two levels of parallelisms in software and hardware to reduce calibration time on multi-core computers HydroGeoChem 5 0 (HGC5) is parallelized using OpenMP for direct solutions for a reactive transport model application and a field-scale coupled flow and transport model application In the reactive transport model a single parallelizable loop is identified to account for over 97% of the total computational time using GPROF Addition of a few lines of OpenMP compiler directives to the loop yields a speedup of about 10 on a 16-core compute node For the field-scale model parallelizable loops in 14 of 174 HGC5 subroutines that require 99% of the execution time are identified As these loops are parallelized Incrementally the scalability is found to be limited by a loop where Cray PAT detects over 90% cache missing rates With this loop rewritten similar speedup as the first application is achieved The OpenMP-parallelized code can be run efficiently on multiple workstations in a network or multiple compute nodes on a cluster as slaves using parallel PEST to speedup model calibration To run calibration on clusters as a single task the Levenberg-Marquardt algorithm is added to HGC5 with the Jacobian calculation and lambda search parallelized using MPI With this hybrid approach 100-200 compute cores are used to reduce the calibration time from weeks to a few hours for these two applications This approach is applicable to most of the existing groundwater model codes for many applications Published by Elsevier Ltd
关键词	PERFORMANCE OPENMP
英文关键词	Reactive transport; Coupled flow and transport; Levenberg-Marquardt algorithm; Profile; Cache
语种	英语
WOS研究方向	Computer Science ; Geology
WOS类目	Computer Science, Interdisciplinary Applications ; Geosciences, Multidisciplinary
WOS记录号	WOS:000284923900007
来源期刊	COMPUTERS & GEOSCIENCES
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/257815
推荐引用方式 GB/T 7714	Tang, Guoping,D'Azevedo, Eduardo F.,Zhang, Fan,et al. Application of a hybrid MPI/OpenMP approach for parallel groundwater model calibration using multi-core computers[J]. 中国科学院青藏高原研究所,2010,36(11).
APA	Tang, Guoping,D'Azevedo, Eduardo F.,Zhang, Fan,Parker, Jack C.,Watson, David B.,&Jardine, Philip M..(2010).Application of a hybrid MPI/OpenMP approach for parallel groundwater model calibration using multi-core computers.COMPUTERS & GEOSCIENCES,36(11).
MLA	Tang, Guoping,et al."Application of a hybrid MPI/OpenMP approach for parallel groundwater model calibration using multi-core computers".COMPUTERS & GEOSCIENCES 36.11(2010).