Memory controller

Computer hardware

CAS latency

Algorithm

Memory management

Interleaved memory

Embedded system

Dram

Operating system

Telecommunications

Parallel computing

Computer science

NAND gate

Latency (audio)

Mathematics

Logic gate

Bottleneck

Semiconductor memory

Block (permutation group theory)

Geometry

Racetrack memory

Programming language

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