'Vector clocks' diaporamas de présentation

Causality

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CS514: Intermediate Course in Operating Systems

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CS514: Intermediate Course in Operating Systems

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Reading material

Reading material. Course book: Chapter 6.8 and 9.1 of Burns & Wellings (not language specific parts) E-books at LiU library: See web page links. This lecture. Overview of some basic notions in timing and how distributed systems are affected by them

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Data Race Detection

Data Race Detection. Assaf Schuster. What is a Data Race?. Two concurrent accesses to a shared location, at least one of them for writing. Result non-deterministic For some memory models result is undefined Indicative of a bug. Thread 1 Thread 2 X++ T=Y Z=2 X++. LOAD X

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CPSC 668 Distributed Algorithms and Systems

CPSC 668 Distributed Algorithms and Systems. Fall 2006 Prof. Jennifer Welch. p 0. p 0. m 0. m 1. m 0. m 1. p 1. p 1. Logical Clocks Motivation. In an asynchronous system, often cannot tell which of two events occurred before the other: Example A Example B.

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OPERATING SYSTEM DESIGN PHILOSOPHY

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COMP 655: Distributed/Operating Systems

COMP 655: Distributed/Operating Systems. Summer 2011 Dr. Chunbo Chu Week 6: Synchronyzation. Clock Synchronization. Figure 6-1. When each machine has its own clock, an event that occurred after another event may nevertheless be assigned an earlier time. Clock Synchronization Algorithms.

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Tabula

Tabula. Components. GUI. Chat. Board. Log. Network. Patterns in our final design. = Strategy. Singleton. Model View Controller. Factory. Board Subsystem. Problem: A click, drag, move on the canvas means different things in different contexts: Click in erase mode, delete an object.

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Runtime Safety Analysis of Multithreaded Programs

Runtime Safety Analysis of Multithreaded Programs. Koushik Sen University of Illinois at Urbana-Champaign, USA. Co-authors Grigore Rosu and Gul Agha. Talk Overview. Motivation MultiPathExplorer Motivating example Instrumentation based on vector clocks

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Synchronization I

Synchronization I. CSE5306 Lecture Quiz 16 due at 5 PM Saturday, 4 October 2014. 6 Synchronization. Cooperating processes march in lock step, as they share resources; e.g., printer, mailbox. Synchronization is paying attention to the passage of time or ordering of events.

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Ordered Communication

Ordered Communication. Ordered Communication. Define guarantees about the order of deliveries inside group of processes Type of ordering: Deliveries respect the FIFO ordering of the corresponding sendings Deliveries respect the Causal ordering of the corresponding sendings

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Dynamo

Dynamo. Kay Ousterhout. Goals. Small files Always writeable Low latency Measured at 99.9 th percentile. Non-goals. Untrusted nodes Relational schema Hierarchical namespace. Key-Value Store. Big (Old?) Ideas. Replication: Store every object on N nodes. N = 3. Consistent Hashing.

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Logical Clocks

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Advance OS (CS G623)

Advance OS (CS G623). LECTURE 3. Theoretical Aspects. Limitations of Distributed Systems Logical Clocks Causal Ordering Global State Recording Termination Detection. 2. Limitations. Absence of Global clock Absence of Shared Memory. S1:A. S1:A. S1:A. S2:A. S2:A. S2:A.

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Logical Clocks and Global State

Logical Clocks and Global State. Causal Relations between Events. Typical events in a distributed system execution of an instruction sending of a message receipt of a message happened before relation ? between events A and B holds if

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Logical Clocks and Global State

Logical Clocks and Global State. Causal Relations between Events. Typical events in a distributed system execution of an instruction sending of a message receipt of a message happened before relation ? between events A and B holds if

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Distributed Systems (15-440)

Distributed Systems (15-440). Mohammad Hammoud December 4 th , 2013. Course Objectives. The course aims at providing an in-depth and hands-on understanding on. How modern distributed systems meet the demands of contemporary distributed applications.

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Time and Ordering

Time and Ordering. The two critical differences between centralized and distributed systems are: absence of shared memory absence of a global clock We will study: how programming mechanisms change as a result of these differences algorithms that operate in the absence of a global clock

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