Understanding the Usage of MPI in Exascale Proxy Applications
Abstract: The Exascale Computing Project (ECP) focuses on the development of future exascale-capable applications. Most ECP applications use the Message Passing Interface (MPI) as their parallel programming model and create mini-apps to serve as proxies. This paper explores the explicit usage of MPI in ECP proxy applications. For our study, we empirically analyze fourteen proxy applications from the ECP Proxy Apps Suite. Our result shows that a small subset of features from MPI is commonly used in the proxies of exascale capable applications, even when they reference third-party libraries. Our study contributes to a better understanding of the use of MPI in current exascale applications. This finding can help focus software investments made for exascale systems in the MPI middleware including optimization, fault-tolerance, tuning, and hardware-offload.
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