Preliminary experience with openmp memory management implementation

Abstract

Because of the evolution of compute units, memory heterogeneity is becoming popular in HPC systems. But dealing with such various memory levels often requires different approaches and interfaces. For this purpose, OpenMP 5.0 defines memory-management constructs to offer application developers the ability to tackle the issue of exploiting multiple memory spaces in a portable way. This paper proposes an overview of memory-management from applications to runtimes. Thus, we describe a convenient way to tune an application to include memory management constructs. We also detail a methodology to integrate them into an OpenMP runtime supporting multiple memory types (DDR, MCDRAM and NVDIMM). We implement our design into the MPC framework, while presenting some results on a realistic benchmark.