Enabling CXL Memory Expansion for In-Memory Database Management Systems

Ahn, Minseon; Chang, Andrew; Lee, Donghun; Gim, Jongmin; Kim, Jungmin; Jung, Jaemin; Rebholz, Oliver; Pham, Vincent N.; Malladi, Krishna T.; Ki, Yang Seok

doi:10.1145/3533737.3535090

Cited by 13 publications

(2 citation statements)

References 6 publications

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“…CXL, a cache-coherent interconnect that runs on top of PCIe, enables memory expanders such as the Samsung 512GB module [22] to increase system memory capacity without consuming DIMM slots. Prototypes from Samsung [27], KAIST [42,50] and Meta [53] have demonstrated the potential of CXL technology. CXL and JDEC (DDR) [15] memory standards have agreed to collaborate on new persistent memory research, strengthening the availability of future BAS devices [6].…”

Section: Byte-addressable Storage (Bas)mentioning

confidence: 99%

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WiscSort: External Sorting for Byte-Addressable Storage

Banakar

Patel

et al. 2023

Proc. VLDB Endow.

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We present WiscSort, a new approach to high-performance concurrent sorting for existing and future byte-addressable storage (BAS) devices. WiscSort carefully reduces writes, exploits random reads by splitting keys and values during sorting, and performs interference-aware scheduling with thread pool sizing to avoid I/O bandwidth degradation. We introduce the BRAID model which encompasses the unique characteristics of BAS devices. Many state-of-the-art sorting systems do not comply with the BRAID model and deliver sub-optimal performance, whereas WiscSort demonstrates the effectiveness of complying with BRAID. We show that WiscSort is 2-7 x faster than competing approaches on a standard sort benchmark. We evaluate the effectiveness of key-value separation on different key-value sizes and compare our concurrency optimizations with various other concurrency models. Finally, we emulate generic BAS devices and show how our techniques perform well with various combinations of hardware properties.

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Section: Byte-addressable Storage (Bas)mentioning

confidence: 99%

“…This memory now mimics a CXL byte-addressable storage device. This is a well established emulation technique [27,50] that provides close to real CXL device performance [22]. The emulation test bed comprises two 20-core Intel Xeon Gold 5218R CPU with scaling governor set to performance and hyperthreading disabled.…”

Section: Other Braid Devicesmentioning

confidence: 99%