Interoperability strategies for GASPI and MPI in large-scale scientific applications. (May 2019)

• Record Type: Journal Article
• Authors: Simmendinger, Christian; Iakymchuk, Roman; Cebamanos, Luis; Akhmetova, Dana; Bartsch, Valeria; Rotaru, Tiberiu; Rahn, Mirko; Laure, Erwin; Markidis, Stefano
• Other Names: Mencagli Gabriele guest-editor.; França Felipe MG guest-editor.; Bentes Cristiana Barbosa guest-editor.; Justen Marzulo Leandro Augusto guest-editor.; Lima Pilla Mauricio guest-editor.; Wyrzykowski Roman guest-editor.; Deelman Ewa guest-editor.
• Is Part Of: International journal of high performance computing applications. Volume 33:Number 3(2019)
• Page Start: 554
• Page End: 568
• Publication Date: 2019-05
• Subjects: Interoperability -- GASPI -- MPI -- iPIC3D -- Ludwig -- MiniGhost -- halo exchange -- Allreduce; High performance computing -- Periodicals; Supercomputers -- Periodicals; 004.1105
• DOI: 10.1177/1094342018808359
• Languages: English
• ISSNs: 1094-3420

Abstract

One of the main hurdles of partitioned global address space (PGAS) approaches is the dominance of message passing interface (MPI), which as a de facto standard appears in the code basis of many applications. To take advantage of the PGAS APIs like global address space programming interface (GASPI) without a major change in the code basis, interoperability between MPI and PGAS approaches needs to be ensured. In this article, we consider an interoperable GASPI/MPI implementation for the communication/performance crucial parts of the Ludwig and iPIC3D applications. To address the discovered performance limitations, we develop a novel strategy for significantly improved performance and interoperability between both APIs by leveraging GASPI shared windows and shared notifications. First results with a corresponding implementation in the MiniGhost proxy application and the Allreduce collective operation demonstrate the viability of this approach.