NDLI: Making fortran legacy code more functional: using the BGS* geomagnetic field modelling system as an example

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Making fortran legacy code more functional: using the BGS* geomagnetic field modelling system as an example

Making fortran legacy code more functional: using the BGS* geomagnetic field modelling system as an example

Content Provider	ACM Digital Library
Author	Bainbridge, Brian Scholz, Sven-Bodo Vießmann, Hans-Nikolai Flower, Simon Šinkarovs, Artjoms Hamilton, Brian
Abstract	This paper presents an application case study of the British Geological Survey's (BGS) Geomagnetic Field Modelling System code. The program consists of roughly 20 000 lines of highly-tuned Fortran MPI code that has a runtime of about 12 hours for a signal execution cycle on a cluster utilising approximately 100 CPU cores. The program contains a sequential bottleneck that executes on a single node of the cluster and takes up to 50% of the overall runtime. We describe an experiment in which we rewrote the bottleneck Fortran code in SaC, to make use of auto-parallelisation provided by the SaC compiler. The paper also presents an implementation of a foreign-function interface, to link the SaC kernel with the Fortran application. Our initial performance measurements compare the SaC kernel performance with the Fortran bottleneck code; we also present results using an OpenMP Fortran implementation. Our figures show that the SaC-based implementation achieves roughly a 12.5% runtime improvement, and outperforms the OpenMP implementation.
Starting Page	1
Ending Page	13
Page Count	13
File Format	PDF
ISBN	9781450342735
DOI	10.1145/2897336.2897348
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-09-14
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	High-performance computing Eigensystem Single-assignment c Foreign function interface Functional programming Fortran
Content Type	Text
Resource Type	Article

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