%0 Journal Article
%T Interoperability strategies for GASPI and MPI in large
%A Christian Simmendinger
%A Dana Akhmetova
%A Erwin Laure
%A Luis Cebamanos
%A Mirko Rahn
%A Roman Iakymchuk
%A Stefano Markidis
%A Tiberiu Rotaru
%A Valeria Bartsch
%J The International Journal of High Performance Computing Applications
%@ 1741-2846
%D 2019
%R 10.1177/1094342018808359
%X 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
%K Interoperability
%K GASPI
%K MPI
%K iPIC3D
%K Ludwig
%K MiniGhost
%K halo exchange
%K Allreduce
%U https://journals.sagepub.com/doi/full/10.1177/1094342018808359