On-Demand Snapshot: An Efficient Versioning File System for Phase-Change Memory

Lee, Eunji; Jang, Jee Eun; Kim, Taeseok; Bahn, Hyokyung

doi:10.1109/tkde.2013.35

Cited by 30 publications

(20 citation statements)

References 21 publications

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“…However, PCM has weaknesses to substitute DRAM memory in its entirety as its access time is relatively slower compared to DRAM and it has limited write endurance of 10 6 -10 8 . Thus, PCM is recently considered as a high-speed secondary storage medium as well as far memory that is to be used along with DRAM [3][4][5].…”

Section: Introductionmentioning

confidence: 99%

A Working-set Sensitive Page Replacement Policy for PCM-based Swap Systems

Park¹,

Bahn²

2017

JSTS:Journal of Semiconductor Technology and Science

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Abstract-Due to the recent advances in PhageChange Memory (PCM) technologies, a new memory hierarchy of computer systems with PCM is expected to appear. In this paper, we present a new page replacement policy that adopts PCM as a high speed swap device. As PCM has limited write endurance, our goal is to minimize the amount of data written to PCM. To do so, we defer the eviction of dirty pages in proportion to their dirtiness. However, excessive preservation of dirty pages in memory may deteriorate the page fault rate, especially when the memory capacity is not enough to accommodate full working-set pages. Thus, our policy monitors the current working-set size of the system, and controls the deferring level of dirty pages not to degrade the system performances. Simulation experiments show that the proposed policy reduces the write traffic to PCM by 160% without performance degradations.

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Section: Introductionmentioning

confidence: 99%

A Working-set Sensitive Page Replacement Policy for PCM-based Swap Systems

Park¹,

Bahn²

2017

JSTS:Journal of Semiconductor Technology and Science

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“…However, PCM has weaknesses to become a main memory medium as its access time is relatively slower (about 1-5x read, 5-25x write) compared to DRAM and it has limited write endurance. Hence recently, it is being considered as a high-speed storage medium (like swap device) or longlatency memory that is to be used with a DRAM buffer [1,3,4,11,12]. This paper presents a new page replacement policy for the system that uses PCM as a swap device.…”

Section: Introductionmentioning

confidence: 99%

“…Meanwhile, PCM is known to possess significantly different physical characteristics from hard disks. As a result, PCM specific file systems [11,12] and PCM specific memory management techniques [1,3,4] have been extensively studied. Unlike these studies, research on virtual memory systems that use PCM as a swap device is in its infancy.…”

Section: Introductionmentioning

confidence: 99%

“…Though details of the architectures are different, the role of additional DRAM is commonly to hide the slow write operations of PCM and also increase the lifespan of PCM by absorbing frequent write operations. Studies on PCM specific file systems also aim to reduce write traffic to PCM [11,12]. This paper reduces the write traffic to PCM-based swap devices by judiciously managing virtual memory page replacement policies.…”

Section: Introductionmentioning

confidence: 99%

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LDF-CLOCK: The Least-Dirty-First CLOCK Replacement Policy for PCM-based Swap Devices

Yoo¹,

Lee²,

Bahn³

2015

JSTS:Journal of Semiconductor Technology and Science

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Abstract-Phase-change memory (PCM) is a promising technology that is anticipated to be used in the memory hierarchy of future computer systems. However, its access time is relatively slower than DRAM and it has limited endurance cycle. Due to this reason, PCM is being considered as a high-speed storage medium (like swap device) or long-latency memory. In this paper, we adopt PCM as a virtual memory swap device and present a new page replacement policy that considers the characteristics of PCM. Specifically, we aim to reduce the write traffic to PCM by considering the dirtiness of pages when making a replacement decision. The proposed replacement policy tracks the dirtiness of a page at the granularity of a sub-page and replaces the least dirty page among pages not recently used. Experimental results with various workloads show that the proposed policy reduces the amount of data written to PCM by 22.9% on average and up to 73.7% compared to CLOCK. It also extends the lifespan of PCM by 49.0% and reduces the energy consumption of PCM by 3.0% on average.

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“…In traditional HDD-based swap storage, a large amount of adjacent data are loaded together when a page fault occurs since the seek time of HDD is very large [6]. To improve CPU utilization, a process that incurs a page fault becomes blocked and the CPU is switched to other process while handling the page fault.…”

Section: Introductionmentioning

confidence: 99%

Efficient management of PCM-based swap storage

Park

Ahn

Bahn

2015

IEICE Electron. Express

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This letter explores the performance of PCM-based swap storage and presents three management techniques. First, we attach PCM on DIMM slots to eliminate block I/O overhead and remove the context switching process while handling page faults. Second, we reduce the page size and turn off the read-ahead option to consider the high performance characteristics of PCM. Third, we decrease the DRAM memory size to save energy consumption without sacrificing the performance.

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On-Demand Snapshot: An Efficient Versioning File System for Phase-Change Memory

Cited by 30 publications

References 21 publications

A Working-set Sensitive Page Replacement Policy for PCM-based Swap Systems

A Working-set Sensitive Page Replacement Policy for PCM-based Swap Systems

LDF-CLOCK: The Least-Dirty-First CLOCK Replacement Policy for PCM-based Swap Devices

Efficient management of PCM-based swap storage

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