Unimem: Runtime Data Management on Non-Volatile Memory-Based Heterogeneous Main Memory for High Performance Computing

Non-volatile memory (NVM) provides a scalable and power-efficient solution to replace dynamic random access (DRAM) as main memory. However, because of the relatively high latency low bandwidth NVM, NVM is often paired with DRAM build heterogeneous system (HMS). As result, data objects application must be carefully placed for best performance. In this paper, we introduce lightweight runtime that automatically transparently manages placement on HMS without requirement hardware modifications disruptive change applications. Leveraging online profiling performance models, characterizes patterns associated objects, minimizes unnecessary movement. Our effectively bridges gap between DRAM. We demonstrate using majority can feasible future HPC systems assistance software-based management.