arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.12775cs.AR
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CLR-DRAM:一种支持动态容量-延迟权衡的低成本DRAM架构

CLR-DRAM: A Low-Cost DRAM Architecture Enabling Dynamic Capacity-Latency Trade-Off

Haocong Luo, Taha Shahroodi, Hasan Hassan, Minesh Patel, Abdullah Giray Yaglikci, Lois Orosa, Jisung Park, Onur Mutlu

摘要:

DRAM是流行的主存技术,但其较长的访问延迟会限制许多工作负载的性能。尽管现有技术提供了减少DRAM访问延迟的DRAM设计,但是其减少的存储容量阻碍了需要大存储器容量的工作负载的性能。由于容量-延迟的权衡在设计时是固定的,因此以前的工作无法在非常不同和动态的工作负载需求下实现最大性能。本文提出了容量-延迟-可重配置DRAM(CLR-DRAM),一种新的DRAM架构,使动态的容量-延迟权衡在低成本下。CLR-DRAM允许动态重新配置任何DRAM行,以在两种操作模式之间切换:1)最大容量模式,其中每个DRAM单元单独操作以实现与密度优化的商品DRAM芯片大致相同的存储密度,以及2)高性能模式,其中DRAM行中的两个相邻DRAM单元和它们的读出放大器被耦合以作为单个低-延迟逻辑单元由单个逻辑读出放大器驱动。我们通过在每个DRAM子阵列中添加隔离晶体管来实现CLR-DRAM。我们的评估表明,CLR-DRAM可以提高系统性能和DRAM的能耗分别为18.6%和29.7%,平均与四核多编程工作负载。我们相信,CLR-DRAM为系统开辟了新的研究方向,以适应工作负载的多样化和动态变化的内存容量和访问延迟需求。

英文摘要:

DRAM is the prevalent main memory technology, but its long access latency can limit the performance of many workloads. Although prior works provide DRAM designs that reduce DRAM access latency, their reduced storage capacities hinder the performance of workloads that need large memory capacity. Because the capacity-latency trade-off is fixed at design time, previous works cannot achieve maximum performance under very different and dynamic workload demands. This paper proposes Capacity-Latency-Reconfigurable DRAM (CLR-DRAM), a new DRAM architecture that enables dynamic capacity-latency trade-off at low cost. CLR-DRAM allows dynamic reconfiguration of any DRAM row to switch between two operating modes: 1) max-capacity mode, where every DRAM cell operates individually to achieve approximately the same storage density as a density-optimized commodity DRAM chip and 2) high-performance mode, where two adjacent DRAM cells in a DRAM row and their sense amplifiers are coupled to operate as a single low-latency logical cell driven by a single logical sense amplifier. We implement CLR-DRAM by adding isolation transistors in each DRAM subarray. Our evaluations show that CLR-DRAM can improve system performance and DRAM energy consumption by 18.6% and 29.7% on average with four-core multiprogrammed workloads. We believe that CLR-DRAM opens new research directions for a system to adapt to the diverse and dynamically changing memory capacity and access latency demands of workloads.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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