MAC: Memory access coalescer for 3D-stacked memory

Xi Wang, Antonino Tumeo, John D. Leidel, Jie Li, Yong Chen

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

4 Scopus citations


Emerging data-intensive applications, such as graph analytics and data mining, exhibit irregular memory access patterns. Research has shown that with these memory-bound applications, traditional cache-based processor architectures, which exploit locality and regular patterns to mitigate the memory-wall issue, are inefficient. Meantime, novel 3D-stacked memory devices, such as Hybrid Memory Cube (HMC) and High Bandwidth Memory (HBM), promise significant increases in bandwidth that appear extremely appealing for memory-bound applications. However, conventional memory interfaces designed for cache-based architectures and JEDEC DDR devices fit poorly with the 3D-stacked memory, which leads to significant under-utilization of the promised high bandwidth. As a response to these issues, in this paper we propose MAC (Memory Access Coalescer), a coalescing unit for the 3D-stacked memory. We discuss the design and implementation of MAC, in the context of a custom designed cache-less architecture targeted at data-intensive, irregular applications. Through a custom simulation infrastructure based on the RISC-V toolchain, we show that MAC achieves a coalescing efficiency of 52.85% on average. It improves the performance of the memory system by 60.73% on average for a large set of irregular workloads.

Original languageEnglish
Title of host publicationProceedings of the 48th International Conference on Parallel Processing, ICPP 2019
PublisherAssociation for Computing Machinery
ISBN (Electronic)9781450362955
StatePublished - Aug 5 2019
Event48th International Conference on Parallel Processing, ICPP 2019 - Kyoto, Japan
Duration: Aug 5 2019Aug 8 2019

Publication series

NameACM International Conference Proceeding Series


Conference48th International Conference on Parallel Processing, ICPP 2019


  • 3D-Stacked Memory
  • Irregular Applications
  • Memory Coalescing


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