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200ppm288us288us3472. Topics. Logical clocks. Totally-Ordered Multicasting. Vector timestamps. Readings. Van Steen and Tanenbaum: 5.2. Coulouris: 10.4. L. Lamport, “Time, Clocks and the Ordering of Events in Distributed Systems,” . Topics. Logical clocks. Totally-Ordered Multicasting. Readings. L. Lamport, “Time, Clocks and the Ordering of Events in Distributed Systems,” . Communications of the ACM, . Vol. 21, No. 7, July 1978, pp. 558-565.. CS 3220. Fall 2014. Hadi Esmaeilzadeh. hadi@cc.gatech.edu. . Georgia Institute of Technology. Some slides adopted from Prof. . Milos . Prvulovic. Asynchronous vs. . Synchronious. Glitches and delays are . A river flows at uniform speed . v. w. = 1.0 m/s between parallel shores a distance . D. = 120 m apart. A kayaker can paddle at 2.0 m/s relative to the water.. If the kayaker starts on one shore and always paddles perpendicular to the shoreline, how long does it take him to reach the opposite shore, and how far downstream is he swept?. Demetrios Matsakis (USNO). Lasers, Light, and Legacy. August 1, 2015. Berkeley, CA. . Clockmaking’s. success had . 100’s of . fathers. 1945 - Townes writes memo to Bell Labs on atomic . clocks. Time Dilation. Length Contraction. SPECIAL RELATIVITY. Space, time, motion, revisited. Special Relativity Postulates. The laws of physics are same for all observers in inertial reference frames (IRF). Time keeps on slipping, slipping…. Logistics. Last week’s slides online. Sign up on Piazza now. No really, do it now. Papers are loaded in . HotCRP. Sign up for account at . http://cs7780.ccs.neu.edu. EE324 Lecture 11. Assignment . Start early!. People who are doing well vs. Not doing well. . Last . Time–. RPC. Why remote procedure calls?. Simple way to pass control and data. Elegant transparent way to distribute application. Operating System. . HW Completed By . ??. 1. 2. Windows 7 . Operating . System (OS). 2. Operating Systems. If you have Microsoft Windows 7 installed on one of your computers, I encourage you to do this lab on your computer.. I/O Devices - Keyboard. The number in the I/O register is the key number, called the scan code (not the ASCII code). . Keyboards have fewer than 128 key and only 7 bits are need to represent the key number . Time and Clock Time and Clock Primary standard of time = rotation of earth De facto primary standard = atomic clock (1 atomic second = 9,192,631,770 orbital transitions of Cesium 133 atom. Time and Clock Time and Clock Primary standard of time = rotation of earth De facto primary standard = atomic clock (1 atomic second = 9,192,631,770 orbital transitions of Cesium 133 atom. COS 418: Distributed Systems. Lecture . 4. Wyatt Lloyd. Today. Logical Time: Vector clocks. Distributed Global Snapshots. 2. Lamport. Clocks Review. Q: a .  b . . => . Q: . LC(a) < LC(b) => . Hadi Esmaeilzadeh. hadi@cc.gatech.edu. . Georgia Institute of Technology. Some slides adopted from Prof. . Milos . Prvulovic. Asynchronous vs. . Synchronious. Glitches and delays are . very. hard to deal with.