Efficient and effective buffering of disk blocks in main memory is critical for better file system performance due to a wide speed gap between hard disks. In such system, one the most important design decisions block replacement policy that determines which replace when buffer full. this paper, we show there exists spectrum policies subsumes two seemingly unrelated independent Least Recently Used (LRU) Frequently (LFU) policies. The called LRFU (Least Recently/Frequently Used) formed by how...

Hybrid storage solutions use NAND flash memory based Solid State Drives (SSDs) as non-volatile cache and traditional Hard Disk (HDDs) lower level storage. Unlike a typical cache, internally, the is divided into space overprovisioned space, used for garbage collection. We show that balancing two spaces appropriately helps improve performance of hybrid systems. contrary to expectations, need not be filled with data fullest, but may better served by reserving For this act, we present dynamic...

Virtualization systems should be responsible for satisfying the service level objectives (SLOs) each VM. Performance SLOs, in particular, are generally achieved by isolating underlying hardware resources among VMs. In this paper, we show through empirical evaluation that performance SLOs cannot satisfied with current commercial SSDs. We garbage collection is source of problem and easily controlled because interaction between To control effect on VMs, propose a scheme called OPS isolation....

While the move from SLC to MLC/TLC flash memory technology is increasing SSD capacity at lower cost, it being done cost of sacrificing reliability. An approach remedy this loss employ RAID architecture with chips that comprise SSDs. However, using traditional may result in negative effects as total number writes increase due parity updates, consequently leading increased P/E cycles and higher bit error rates. Using a technique we call Elastic Striping Anywhere Parity (eSAP), develop...

Natural, organic, materials-based artificial synaptic devices have been in the spotlight for wearable/flexible due to their lightweight, biocompatibility, and scalability. In this study, an electronic memristive device based on agarose extracted from plants Rhodophyceae class was fabricated, its memory characteristics analog data processing capabilities were evaluated. The Al/agarose@gold nanoparticle (AuNP) film/indium-tin-oxide (ITO)-structured exhibited reliable resistive switching with...

ABSTRACT A multistage manufacturing process (MMP) is a sequential where products enter machine in each stage and go through multiple stages for their production. In MMP, the machines even with possessing remaining useful life (RUL) at current have to stop production when all previous fail operate. majority of relevant studies focus on predicting RUL without considering characteristics MMP; thus, hardly provide predictive optimum replacement time stage‐level maintenance. The proposed method...

In this study, we examine the influence of overdispersion on statistical inference in a zero-inflated generalized Poisson regression model by simulation experiments and real data analysis. simulated are generated from model, coefficients models estimated. The experiment results show that coefficient estimates for mean zero-inflation probability to ignore underestimate true value when exists, underestimation problem becomes more severe as increases. addition, standard errors underestimated...

We propose a novel kernel-level memory allocator, called M3 (M-cube, Multi-core Multi-bank Memory allocator), that has the following two features. First, it introduces and makes use of notion container, which is defined as unit comprises minimum number page frames can cover all banks organization, by exclusively assigning container to core so each achieves bank parallelism much possible. Second, orchestrates frame allocation pages threads access are dispersed randomly across multiple...

The move from SLC to MLC/TLC flash memory technology is increasing SSD capacity at lower cost, but the cost of sacrificing reliability. An approach remedy this loss employ RAID architecture with chips that comprise SSDs. However, using traditional may result in negative effects as total number writes increased due parity updates. In paper, we describe Elastic Striping and Anywhere Parity (eSAP)-RAID, a scheme allows flexible stripe sizes placement. Using performance lifetime models derive...

article Free Access Share on On the existence of a spectrum policies that subsumes least recently used (LRU) and frequently (LFU) Authors: Donghee Lee Dept. Information Engineering, Cheju National University, Korea Department Computer Seoul 151-742, KoreaView Profile , Jongmoo Choi Jong-Hun Kim Sam H. Noh View Sang Lyul Min Yookun Cho Chong Authors Info & Claims ACM SIGMETRICS Performance Evaluation ReviewVolume 27Issue 1June 1999 pp 134–143https://doi.org/10.1145/301464.301487Online:01 May...

In dual-response-surface optimization, the mean and standard deviation responses are often in conflict. To obtain a satisfactory compromise, Decision Maker (DM)'s preference information on trade-offs between should be incorporated into problem. most existing works, DM expresses subjective judgment through parameter before problem-solving process, after which single solution is obtained. This study proposes posterior articulation approach to optimization. The initially finds set of...

Abstract In Multi-Response Surface Optimization (MRSO), responses are often in conflict. To obtain a satisfactory compromise, the preference information of Decision Maker (DM) on trade-offs among should be incorporated into problem. Most existing methods employ parameters to incorporate DM’s subjective judgment responses. The parameter values specified advance or adjusted an interactive manner. However, it is difficult specify adjust that representative structure without use systematic...