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스토리지 클래스 메모리를 활용한 즉각 구동 시스템의 개발 (pp.207-211)
문영제(Young Je Moon),도인환(In Hwan Doh),박정수(Jung Soo Park),노삼혁(Sam H. Noh) 한국정보과학회 2010 정보과학회 컴퓨팅의 실제 논문지 Vol.16 No.2
스토리지 클래스 메모리 (SCM)는 비휘발성 속성과 바이트 단위의 임의 접근이 가능한 속성을 동시에 보유하고 있는 차세대 메모리 기술로써 그 활용 방안에 있어서 귀추가 주목된다. 기존 시스템에 SCM을 도입하면 시스템의 수행 속도와 안전성을 크게 향상할 수 있을 뿐만 아니라 기존의 시스템에서는 불가능했던 새로운 특징들을 제공할 수 있다. 본 연구는 혁신적인 용도로의 SCM 활용 가능성에 주목하며, 그 일환으로 SCM을 메인 메모리로 활용하여 종료 상태의 시스템에 전원이 인가되는 즉시 종전의 시스템 상태로 되돌아갈 수 있는 SOONN을 제안한다. 본 논문에서는 실제 임베디드 시스템 환경에서 프로토타입 시스템을 개발함으로써 SOONN의 실현 가능성을 제시한다. Storage Class Memory (SCM) has both characteristics of non-volatility and random byte addressability. The advent of SCM can bring about novel and innovative features that are not possible in conventional computing systems. This paper suggests a new system design that turns on/off a system instantly. To do this, we replace the main memory with SCM to retain the volatile system states as the system is turned off. We implement our prototype in an embedded environment and measure its system on/off time.
뉴메모리를 이용한 고성능 및 호환성을 위한 I/O 변환 계층 기술
송현섭(Hyunsub Song),문영제(Young Je Moon),노삼혁(Sam H. Noh) Korean Institute of Information Scientists and Eng 2015 정보과학회논문지 Vol.42 No.4
The rapid advancement of computing technology has triggered the need for fast data I/O processing and high-performance storage technology. Next generation memory technology, which we refer to as new memory, is anticipated to be used for high-performance storage as they have excellent characteristics as a storage device with non-volatility and latency close to DRAM. This research proposes NTL (New memory Translation layer) as a technology to make use of new memory as storage. With the addition of NTL, conventional I/O is served with existing mature disk-based file systems providing compatibility, while new memory I/O is serviced through the NTL to take advantage of the byte-addressability feature of new memory. In this paper, we describe the design of NTL and provide experiment measurement results that show that our design will bring performance benefits.
뉴메모리+DRAM 하이브리드 메모리 시스템에서의 고속부팅 기법 연구
송현호(Hyeon Ho Song),문영제(Young Je Moon),박재형(Jae Hyeong Park),노삼혁(Sam H. Noh) Korean Institute of Information Scientists and Eng 2015 정보과학회논문지 Vol.42 No.4
Next generation memory technologies, which we denote as ‘new memory’, have both non-volatile and byte addressable properties. These characteristics are expected to bring changes to the conventional computer system structure. In this paper, we propose a fast boot technique for hybrid main memory architectures that have both new memory and DRAM. The key technique used for fast booting is write-tracking. Write-tracking is used to detect and manage modified data detection and involves setting the kernel region to read-only. This setting is used to trigger intentional faults upon modification requests. As the fault handler can detect the faulting address, write-tracking makes use of the address to manage the modified data. In particular, in our case, we make use of the MMU (Memory Management Unit) translation table. When a write occurs to the boot completed state, write-tracking preserves the original state of the modified address of the kernel region to a particular location, and execution continues. Upon booting, the fast booting process restores the preserved data to the original kernel region allowing rapid system boot-up. We develop the fast booting technique in an actual embedded board equipped with new memory. The boot time is reduced to less than half a second compared to around 15 seconds that is required for the original system.
뉴메모리 기반 시스템에서 세밀한 COW 관리 기법을 통한 효율적 프로세스 체크포인팅 기법
박재형(Jay H. Park),문영제(Young Je Moon),노삼혁(Sam H. Noh) Korean Institute of Information Scientists and Eng 2017 정보과학회논문지 Vol.44 No.2
We design and implement a process-based fault recovery system to increase the reliability of new memory based computer systems. A rollback point is made at every context switch to which a process can rollback to upon a fault. In this study, a clone process of the original process, which we refer to as a P-process (Persistent-process), is created as a rollback point. Such a design minimizes losses when a fault does occur. Specifically, first, execution loss can be minimized as rollback points are created only at context switches, which bounds the lost execution. Second, as we make use of the COW (Copy-On-Write)mechanism, only those parts of the process memory state that are modified (in page units) are copied decreasing the overhead for creating the P-process. Our experimental results show that the overhead is approximately 5% in 8 out of 11 PARSEC benchmark workloads when P-process is created at every context switch time. Even for workloads that result in considerable overhead, we show that this overhead can be reduced by increasing the P-process generation interval.