Memory controller

Operating system

Algorithm

NAND gate

Logic gate

Embedded system

Parallel computing

Memory management

CAS latency

Geometry

Block (permutation group theory)

Bottleneck

Mathematics

Computer science

Racetrack memory

Interleaved memory

Dram

Telecommunications

Latency (audio)

Computer hardware

Semiconductor memory

I/O latency and throughput is one of the major performance bottlenecks for disk-based database systems. Upcoming persistent memory (PMem) technologies, like Intel's Optane DC Persistent Memory Modules, promise to bridge the gap between NAND-based flash (SSD) and DRAM, and thus eliminate the I/O bottleneck. In this paper, we provide one of the first performance evaluations of PMem in terms of bandwidth and latency. Based on the results, we develop guidelines for efficient PMem usage and two essential I/O primitives tuned for PMem: log writing and block flushing.

Persistent Memory I/O Primitives