PPT-Synchronization in Distributed File Systems

Advanced Operating System Zhuoli Lin Professor Zhang Outline Semantics of File Sharing File Locking Sharing File in Coda Future Work Semantics of File Sharing When two or more users share the same file at the same time it is necessary to define the semantics of reading and writing precisely to avoid problems. wait Bi l s gna C lock acquire D lock release E signalAll Hoare monitor semantics Assume thread T1 is waiting on condition Assume thread T2 is in the monitor Assume thread T2 calls x signal T2 ives u monitor T2 blocks gp T1 takes over monitor run Spring 2009. L-1 Introduction. 1. Today's Lecture. Administrivia. Example topics. 2. 3. Instructors. Instructor. Srini. Seshan. srini@cmu.edu. , Wean Hall . 8113. Office hours: Thursday 1-2pm. Teaching . Macroprogramming. Systems. Presented by: S. M. . Shahriar. . Nirjon. Timothy W.. . Hnat. and . Kamin. Whitehouse. hnat@cs.virginia.edu, WHITEHOUSE@cs.virginia.edu . Motivation. Synchronization Problems. Rui. . Gu. , . Guoliang. . Jin. , . Linhai. Song, . Linjie. Zhu, Shan Lu. University . of Wisconsin – Madison, USA. Proper Thread Synchronization . is . Hard. Very easy to get things wrong. H. ard-to-find concurrency bugs(Data race, Atomicity Violation, Dead Lock). Masahiro Sasabe. and Tetsuya Takine. Osaka University, Japan. 1. DTNRG at IETF 76. Outline. Research background. Time synchronization. Time sync. for mobile ad hoc networks. Relative time synchronization. Marc S. . Orr. †. §. , . Shuai . Che. §. , Ayse Yilmazer. §. ,. Bradford . M. . Beckmann. §. , Mark . D. . Hill. †. §. , . David A. . Wood. †. §. †. UW-Madison, . §. AMD . Research. ASPLOS, March 16, 2015. Kaushik. . Majumdar. Indian Statistical Institute. 8th Mile, Mysore Road. Bangalore 560059. https://sites.google.com/site/isicng/. Workshop on “Cognition, Emotion and Computing,” Infosys Limited, Bangalore, 30 April 2013. . kota. . 21-sep-2015. AGENDA. Introduction. Synchronization. Physical Clocks. Global Positioning System. Algorithms. Future Work. References. Introduction: Real . Time System. 1. . A . Sig Freund. CSC 8320 Fall . 2008. rfreund1@student.gsu.edu. Transparency in Distributed Operating Systems. Evolution of Modern Operating Systems. Centralized operating system. network access and resource sharing. in Wireless Sensor Networks. Philipp Sommer. Roger Wattenhofer. Time Synchronization is a well-studied Problem. Time, Clocks, and the Ordering of Events in a Distributed System. L. Lamport, Communications of the ACM, 1978.. Farnaz. . Moradi. . Asrin. . Javaheri. Outline. Wireless sensor networks. Surveillance Applications. Clock synchronization. Synchronization algorithms. RBS. FTSP. Implementation. Performance Evaluation. Synchronization – Part I . Lecture 9. , October 2, . 2017. Mohammad Hammoud . Today…. Last Session. Naming . (concluded) . Today’s Session. Synchronization. Coordinated Universal Time (UTC). Tracking Time on a Computer. What is a hard disk partition?. File Systems - Partitions. What is a hard disk partition?. Physical (or logical) storage space division on disk. Typically, so can put a file system inside the partition. Prof. Nalini . Venkatasubramanian. . &. Prof. Yusuf . Sarwar. Dept. of Information & Computer Science. University of California, Irvine. Intro to Distributed Systems Middleware. 2. CS 237/. NetSys.