System Optimization of Data Analytics Platforms using Compute Express Link (CXL) Memory
Seokhyun Ryu, Sohyun Kim, Jaeyung Jun, Donguk Moon, Kyungsoo Lee, Jungmin Choi, Sunwoong Kim, Hyungsoo Kim, Luke Kim, Won Ha Choi, Moohyeon Nam, Dooyoung Hwang, Hongchan Roh, Youngpyo Joo · 2023
Compute Express Link (CXL) is attracting from the industry as the latest emerging technology trend. CXL is a newcoherent interface that offering high-bandwidth, low-latency connectivity between host processor and devices such as memory, smart NICs, and accelerators. Unlike the previous DDR interface, CXL interconnect provides a distinct memory interface based on PCIe 5.0 physical layer, and it is expected that system memory or new memory tier can be expanded more flexibly in a different way than before. However, most of the studies covering CXL memory focus on device performance validation, and tend not to interest on real-world’s use case scenarios. This paper introduces two practical use case scenarios on data analytics platform using CXL memory prototype and its support software: 1. Apache Spark, CXL memory takes over the storage’s role that Spark’s shuffle intermediate data space. As a result, it improved the baseline vanilla Spark by 2.2x for TeraSort workload and by an average of 4.9x for shuffle-heavy TPC-DS queries. 2. In-memory DBMS (Database Management System), host memory expansion using CXL memory enhanced query performance by an average of 6.0x for NYC Taxi benchmark, thus expected to reduce total cost of ownership (TCO) by using fewer servers thanscale-out.