HPC for sensitivity studies: simulations with TOMAWAC and TELEMAC-3D

Durand, N. and Bourban, S. and Moulinec, C. and Barber, R. and Audouin, Y. and Gu, X. and Emerson, D. (2011) HPC for sensitivity studies: simulations with TOMAWAC and TELEMAC-3D. In: TELEMAC-MASCARET User Conference 2011, 19-21 October 2011, Paris, France.


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High Performance Computing (HPC) is useful in a range of scientific applications, from running computationallyintensive high-resolution models to running a large number of smaller simulations either to calibrate the model (for example, using genetic algorithms) or to assess a range of design options or model scenarios. One particularly promising area for HPC is when carrying out sensitivity studies. In this case, a large number of simulations are erformed using a systematic variation in the values of certain input parameters in order to determine the effects of each of the parameters on the model results. This type of application is non-intrusive in the sense that no modifications are required to the model source code. Instead, the only changes that need to be made are to usergenerated subroutines and to the files that control the values of the input parameters. In this paper, we describe a script which has been developed for use on an iDataPlex cluster (STFC aresbury Laboratory) and a Cray XE6 supercomputer (UK National Supercomputing Service). The script enables concurrent simulations to be submitted to the system via the queuing facility available on parallel clusters. This is not only relevant for serial instances of the code but is also valid for parallel simulations. Using the script for parallel instances allows the elapsed time for sensitivity studies to be reduced by a factor of approximately NCSIMS´ ICORESOPT, where NCSIMS is the number of concurrent instances and ICORESOPT is the optimum number of cores used for running each parallel instance.

Item Type: Conference or Workshop Item (Paper)
Additional Information: XVIIIth TELEMAC-MASCARET User Conference
Subjects: Maritime > General
Coasts > General
Divisions: Coastal
Depositing User: Unnamed user with email i.services@hrwallingford.com
Date Deposited: 02 Apr 2020 09:49
Last Modified: 01 Jun 2020 14:51
URI: http://eprints.hrwallingford.com/id/eprint/806

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