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ZX: A network file system for high-latency networks

SOFTWARE-PRACTICE & EXPERIENCE 2018年第3期48卷 578-599页

作者： Ballesteros, Francisco J. Guardiola, Gorka Soriano, Enrique Univ Rey Juan Carlos Dept Sistemas Telemat & Computac GSyC Lab Sistemas LSUB Madrid Spain

Using a central file server is good for interactive access to files, because of the coherency implied by a centralized design. In fact, within local area networks, this is a common case. However, distributed environments in use today may exhibit round-trip times on the order of 50 or 100 ms. This is a problem for interactive file access to a central file server because of the resulting access times. Although aggressive caching and loosely synchronized replicas may be used for distributed file access, there are cases where the better coherency provided by a central server is still desirable. In this paper, we present ZX, a distributed file system and protocol designed with latency in mind. It can use caching, but it does not require caching or batching to address latency issues. ZX relies on a novel channel-based file system interface. It includes find requests and leverages streaming requests to work well under high-latency conditions. Unlike other protocols designed for distributed access to a central server, ZX tolerates round-trip times on the order of 50 or 100 ms to access a central file server for interactive usage such as compiling shared sources, running binaries, editing documents, and other similar workloads. It can be used on UNIX using a FUSE adaptor while permitting native ZX speakers to run faster.

关键词： cloud computing network file system operating system

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Parallelizing Git Checkout: a Case Study of I/O Parallelism 34

Parallelizing Git Checkout: a Case Study of I/O Parallelism

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34th IEEE International Symposium on Computer Architecture and High Performance Computing (SBAC-PAD)

作者： Bernardino, Matheus Tavares Goldman, Alfredo Univ Sao Paulo Inst Math & Stat Sao Paulo Brazil

ISBN: (数字)9781665451550

ISBN: (纸本)9781665451550

Version control systems (VCS) are tools used to track and manage the changes made to a set of files over time. Among the VCS tools available today, Git has become the most popular for software development. Being used in small personal projects of a few megabytes and massive corporate repositories with more than 300 GB and 3.5 million files, speed and scalability are among the top priorities for the tool. However, its performance sometimes falls short of what is desired on networked file systems (e.g. NFS), where input and output (I/O) operations tend to be more costly. In particular, that is the case for the checkout command, which is responsible for restoring files from specific versions of a project. Despite the optimizations implemented over the years, the sequential processing of files still carried a large time penalty for NFS, as well as being suboptimal for local file systems on SSDs. In this project, we worked to parallelize the Git checkout machinery, resulting in speedups of up to 4.5x on NFS and 3.6x on SSDs. We also studied how parallelism affects the I/O requests performed by checkout on different storage systems. The optimization was submitted upstream and made available to all Git users starting at version 2.32.0, from June 2021.

关键词： parallel programming git version control systems network file system parallel I/O

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From tore Supra to WEST: Evolution of the CODAC infrastructure

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FUSION ENGINEERING AND DESIGN 2020年 160卷 111822-111822页

作者： Santraine, B. Berne, A. Caulier, G. Colnel, J. Ravenel, N. Leroux, F. CEA IRFM F-13108 St Paul Les Durance France

In 2013 Tore Supra limiter tokamak at CFA Cadarache went through major changes to become the WEST tokamak (Tungsten [W] Environment in Steady state Tokamak). The tokamak was upgraded into an X point divertor device. Taking advantage of its long discharge capability, WEST'S goal is to minimize technological and operational risks of the actively cooled tungsten divertor for ITER. At the same time, Control Data Access and Communication (CODAC) system has been redesigned in order to satisfy the performance and evolutions needed by researchers, and to facilitate maintenance and evolution for the CODAC team. This paper describes the upgrade of the CODAC system from Tore Supra to WEST.

关键词： COTS Commercial Off-The-Shelf DHCP Dynamic Host Configuration Protocol FPGA Field-Programmable Gate Array ITER International Thermonuclear Experimental Reactor NAS network Attached Storage NFS network file system PCS Plasma Control system PXE Preboot eXecution Environment RAM Random Access Memory TFTP Trivial file Transfer Protocol VHDL VHSICHardware Description Language VME Versa Module Eurocard

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Supporting Transactions for Bulk NFSv4 Compounds 20

Supporting Transactions for Bulk NFSv4 Compounds

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13th ACM International systems and Storage Conference (SYSTOR)

作者： Su, Wei Aurora, Akshay Chen, Ming Zadok, Erez SUNY Stony Brook Stony Brook NY 11794 USA Google Menlo Pk CA USA

ISBN: (纸本)9781450375887

More applications nowadays use network and cloud storage;and modern network file system protocols support compounding operations-packing more operations in one request (e.g., NFSv4, SMB). This is known to improve overall throughput and latency by reducing the number of network round trips. It has been reported that by utilizing compounds, NFSv4 performance, especially in high-latency networks, can be improved by orders of magnitude. Alas, with more operations packed into a single message, partial failures become more likely-some server-side operations succeed while others fail to execute. This places a greater challenge on clientside applications to recover from such failures. To solve this and simplify application development, we designed and built TC-NFS, an NFSv4-based network file system with transactional compound execution. We evaluated TC-NFS with different workloads, compounding degrees, and network latencies. Compared to an already existing NFSv4 system that fully utilizes compounds, our end-to-end transactional support adds as little as similar to 1.1% overhead but as much as similar to 25x overhead for some intense micro- and macro-workloads.

关键词： network file system transaction NFSv4

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High-performance internet file system based on multi-download for convergence computing in mobile communication systems

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CLUSTER COMPUTING-THE JOURNAL OF networkS SOFTWARE TOOLS AND APPLICATIONS 2019年第4期22卷 1057-1071页

作者： Moon, Youngjun Kim, Seokhoon Ryoo, Intae Kyung Hee Univ Dept Comp Engn Seoul South Korea Soonchunhyang Univ Dept Comp Software Engn Asan South Korea

This paper proposes the Enhanced Internet file system (EIFS), of which the structure consists of a data manager, disk cache, and multi-download module, to improve the performance of the Common Internet file system (CIFS) and presents an evaluation of its performance. The data manager manages data by changing the page unit size used by the local file system from 4 KB to 1 MB. The multi-download module improves the transfer speed by dividing one file into 1-MB sections, which it then simultaneously downloads to multiple sessions. In addition, the disk cache uses internal memory as a cache to manage the data received from the network and also stores data in the cloud in the form of a virtual image, caching only the file pages requested by the application. The proposed EIFS speeds up the downloading of one file by concatenating two or three sessions for processing at the same time. As EIFS supports VFS and conforms to the POSIX standard, it can be used on multiple systems. The performance of EIFS was evaluated by measuring the download speed and app execution time in a mobile network environment. The test results showed that the file download speed increases for EIFS 2 (two sessions) and EIFS 3 (three sessions) compared to CIFS. The performance evaluations further show that the proposed technique outperforms the CIFS file system in terms of download speed and application execution time.

关键词： CIFS NFS network file system Multi download Disk cache

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Weight Optimization of The Neural Fuzzy system (NFS) Using Genetic Algorithm for Forecasting

Weight Optimization of The Neural Fuzzy System (NFS) Using G...

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International Conference on Computer Science, Information Technology, and Electrical Engineering

作者： Nadia Roosmalita Sari Wayan Firdaus Mahmudy Aji P. Wibawa Gayatri Dwi Santika Fakultas Ekonomi dan Bisnis Islam Institut Agama Islam Negeri Tulungagung Faculty of Computer Science Universitas Brawijaya Faculty of Engineering Universitas Negeri Malang Faculty of Computer Science Jember University

ISBN: (纸本)9781728134376

Inflation is a phenomenon of increasing prices on a continuous basis which results in the increase of other goods. This study proposes the Neural Fuzzy system (NFS) as a method to predict the rate of inflation in Indonesia. To improve the accuracy, the weight at this stage of Neural network to be determined correctly. So, this research using Genetic Algorithms to determine the best weights in the training process. This weight can be used to obtained output thorough testing process. Then, it can be processed again in the next step using FIS Sugeno until obtained the end forecasting result. To increase more accurate forecasting results, the establishment of fuzzy rules must be specified correctly. It takes a novelty that minimizes the number of fuzzy rules by dividing the initial parameter into the two (positive and negative) on stage Neural network. So, the fuzzy rules generated less. To measure the accuracy of the system used the RMSE technique. Based on this result, the proposed method obtained for 0.89.

关键词： Inflation Forecasting Optimization neural fuzzy system Root mean square error (RMSE) Economic Inflation Fuzzy rules Genetic Algorithm (GA) network file system Fuzzy systems Neural network

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ZnO Nanoflakes based Enzymatic Sensor for the determination of lactic acid in sweat

ZnO Nanoflakes based Enzymatic Sensor for the determination ...

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IEEE Sensors

作者： Fahmida Alam Ahmed Hasnain Jalal Shahrzad Forouzanfar Chunlei Wang Nezih Pala Florida International University Department of Electrical and Computer Engineering Miami Florida USA

ISBN: (纸本)9781728116358

We report on highly sensitive and flexible biosensors for noninvasive lactate monitoring in human sweat based on zinc oxide (ZnO) nanostructures that do not require linker layer for surface functionalization. Towards fabrication of the biosensors two-dimensional (2D) ZnO nanoflakes (NFs) were synthesized on flexible polyethylene terephthalate (PET) substrates by using single step sonochemical method. The cyclic voltammetry (CV) measurements in the lactate concentration range of 10 pM - 20 mM yielded the sensitivity of 11.76 μA/decade/cm~2 and the detection limit of <;10 pM. Moreover, the results showed that ZnO NFs-based enzymatic biosensor could provide reliable lactate detection (average of ～85% recovery) in human sweat samples. High isoelectric point allows a direct, stable pathway for rapid electron transport without any mediator when an analyte is immobilized on NFs and improves electron transfer rate.

关键词： ZnO nanoflakes sonochemical synthesis sweat lactate biosensor Sweating zinc oxides Biosensors Lactates lactic acid network file system electron transfer

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Characteristics of L-band transmissivity and effective scattering albedo of boreal forests: a case study in northeast China

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REMOTE SENSING LETTERS 2017年第12期8卷 1200-1209页

作者： Zheng, Xingming Li, Xiaofeng Jin, Mengjie Jiang, Tao Zhao, Kai Chinese Acad Sci Northeast Inst Geog & Agroecol Changchun Jilin Peoples R China Chinese Acad Sci Changchun Jingyuetan Remote Sensing Test Site Changchun Jilin Peoples R China

Modeling of forest transmissivity (t(F)), or nadir optical depth (n(F)), and effective scattering albedo (omega(F)) of L-band radiometer, helps to reduce the uncertainty in retrieved forest soil parameters. To address this issue, the L-band downward brightness temperatures of boreal forests in Northeast China were observed. Forest t(F) (or n(F)) and omega(F) were derived from in-situ soil parameters and observed forest brightness temperature by combining the advanced integral equation model (AIEM), the zero-order radiative transfer model (tau omega), and a genetic algorithm (GA). Some conclusions about forest radiative transfer properties are revealed here: 1) t(F) is nearly 0.3 higher in summer than in winter, and this seasonal difference in tF is bigger than was previously thought. Next to the difference in the amount of leaves present, air temperature might be an important factor influencing this seasonal variation in t(F). 2) A moderate dependence of n(F) on polarization exists. 3) Dependence of nF on the incidence angle was only observed in winter. 4) Forest omega(F) is independent of polarization, incidence angle, woody volume and forest type, but the omega(F) value derived in this study is significantly higher than the default values of the SMOS and SMAP algorithms.

关键词： Boreal Boreal forests albedo L-band network file system Forest Case studies angle of incidence Taiga Polarization Northeast brightness temperature

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An Overview of VM Live Migration Strategies and Technologies

An Overview of VM Live Migration Strategies and Technologies

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International Conference on Electronics, Communication and Aerospace Technology

作者： Krushi Damania Shraddha Holmukhe Videet Singhai Prasenjit Bhavathankar Department of Information Technology Sardar Patel Institute of Technology

ISBN: (纸本)9781538609668

Cloud computing is an effective technology in handling computation with dynamically scalable resources. With the growth of multimedia applications, mobile applications have become resource-intensive. To provide better connectivity with the cloud, cloudlets have been introduced, which in turns provide low latency and high bandwidth. Cloudlets also enable us to optimize Virtual Machine Migration amongst them. In this paper, we discuss the Live migration of Virtual machines, various types of live migration with respect to strategies supplemented with storage technologies;NFS and GlusterFS. An overview of migration in cloudlets and Fog computing architecture are elucidated.

关键词： Cloud Computing Virtualization Live Migration Pre-copy Post-copy Hybrid-copy network file system GlusterFS Cloudlet Fog Computing

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Addressing the needs of the 21st century nurse leader in the RWJF NFS program

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NURSING OUTLOOK 2017年第3期65卷 303-304页

作者： Bowen, Felesia Cohn, Elizabeth Gross Rutgers State Univ Sch Nursing Ctr Urban Youth & Families Francois Xavier Bagnoud Endowed Chair CommunityP Newark NJ USA Adelphi Univ Ctr Hlth Innovat Coll Nursing & Publ Hlth Nexus Bldg Room 3121 South Ave Garden City NY 11030 USA Columbia Univ Irving Inst Clin & Translat Sci New York NY USA

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