Migration of an Atmospheric Simulation Code to an OpenACC Platform Using the Xevolver Framework

Kazuhiko Komatsu, Ryusuke Egawa, Shoichi Hirasawa, Hiroyuki Takizawa, Ken'Ichi Itakura, Hiroaki Kobayashi

Research output: Chapter in Book/Report/Conference proceedingConference contribution

7 Citations (Scopus)

Abstract

As the diversity of HPC systems increases, even legacy HPC applications often need to use accelerators for higher performance. To migrate large-scale legacy HPC applications to modern HPC systems including accelerators, OpenACC is a promising approach because its directive-based approach can prevent drastic code modifications. This paper shows a case study of the migration of a large-scale atmospheric simulation code to an OpenACC platform by keeping the maintainability of the original code. Although OpenACC enables an application to use accelerators by adding a small number of directives, it requires modifying the original code to achieve a high performance in most cases, and tends to degrade the maintainability and/or portability. To avoid such code modifications, this paper adopts a code transformation framework, Xevolver. Instead of directly modifying the code, custom code transformation rules and custom directives are defined using the Xevolver framework. This paper first shows that just inserting OpenACC directives does not lead to high performance and non-Trivial code modifications are required in practice. Then, the direct code modification can be avoided by using externally defined transformation rules and directives to keep the original code unchanged as much as possible. Finally, the performance evaluation shows that the code modifications can improve the performance of the OpenACC code.

Original languageEnglish
Title of host publicationProceedings - 2015 3rd International Symposium on Computing and Networking, CANDAR 2015
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages515-520
Number of pages6
ISBN (Electronic)9781467397971
DOIs
Publication statusPublished - 2016 Mar 2
Event3rd International Symposium on Computing and Networking, CANDAR 2015 - Sapporo, Hokkaido, Japan
Duration: 2015 Dec 82015 Dec 11

Publication series

NameProceedings - 2015 3rd International Symposium on Computing and Networking, CANDAR 2015

Other

Other3rd International Symposium on Computing and Networking, CANDAR 2015
Country/TerritoryJapan
CitySapporo, Hokkaido
Period15/12/815/12/11

ASJC Scopus subject areas

  • Computer Science Applications
  • Computational Theory and Mathematics
  • Computer Networks and Communications

Fingerprint

Dive into the research topics of 'Migration of an Atmospheric Simulation Code to an OpenACC Platform Using the Xevolver Framework'. Together they form a unique fingerprint.

Cite this