  The Intel Optane DC Persistent Memory (DCPM) is an attractive novel
technology for building storage systems for data intensive HPC applications, as
it provides lower cost per byte, low standby power and larger capacities than
DRAM, with comparable latency. This work provides an in-depth evaluation of the
energy consumption of the Optane DCPM, using well-established indexes
specifically designed to address the challenges and constraints of the
persistent memories. We study the energy efficiency of the Optane DCPM for
several indexing data structures and for the LevelDB key-value store, under
different types of YCSB workloads. By integrating an Optane DCPM in a memory
system, the energy drops by 71.2% and the throughput increases by 37.3% for the
LevelDB experiments, compared to a typical SSD storage solution.
