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Course’s Topics

Course’s Topics

Course’s Topics. Theoretical foundations Waves, Traversal Managing physical clocks in distributed systems Logical clocks: Lamport's and vector clocks Global state recording, Termination detection OS concepts Distributed mutual exclusion Handling deadlocks Resource management

By nile
(109 views)

CPSC 668 Distributed Algorithms and Systems

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.

By signa
(103 views)

OPERATING SYSTEM DESIGN PHILOSOPHY

OPERATING SYSTEM DESIGN PHILOSOPHY

OPERATING SYSTEM DESIGN PHILOSOPHY. Separatist: Clear distinction between policies ( What?) and mechanisms ( How?) Compatibilist: An OS is to secure “compatibility” among user programs so that they may be transferred between widely different installations.sd

By skylar
(106 views)

Tabula

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.

By satya
(120 views)

Distributed Systems (15-440)

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.

By oded
(126 views)

Dynamo

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.

By ehren
(136 views)

Logical Clocks

Logical Clocks

Logical Clocks. event ordering, happened-before relation (review) logical clocks conditions scalar clocks condition implementation limitation vector clocks condition implementation application – causal ordering of messages birman-schiper-stephenson schiper-eggli-sandoz matrix clocks.

By zasha
(244 views)

Ordered Communication

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

By tamarr
(71 views)

Data Race Detection

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

By gwylan
(122 views)

CS514: Intermediate Course in Operating Systems

CS514: Intermediate Course in Operating Systems

CS514: Intermediate Course in Operating Systems. Professor Ken Birman Krzys Ostrowski: TA. Recap… Consistent cuts. On Monday we saw that simply gathering the state of a system isn’t enough Often the “state” includes tricky relationships

By fifi
(97 views)

CS514: Intermediate Course in Operating Systems

CS514: Intermediate Course in Operating Systems

CS514: Intermediate Course in Operating Systems. Professor Ken Birman. Recap… Consistent cuts. On Monday we saw that simply gathering the state of a system isn’t enough Often the “state” includes tricky relationships

By jetta
(77 views)

Causality

Causality

Causality. The “happens before” relation. happens before (causes). A message is sent from to. transitivity. and. “happens before” is a partial order. Parallel events:. “happens before” is a partial order. Parallel events:. We can move parallel events.

By ira
(140 views)

Time and Ordering

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

By semah
(88 views)

Logical Clocks and Global State

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

By reed
(110 views)

Logical Clocks and Global State

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

By tasha
(100 views)

Advance OS (CS G623)

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.

By loc
(108 views)

Synchronization I

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.

By beauregard-daniel
(308 views)

COMP 655: Distributed/Operating Systems

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.

By lazzaro-murphy
(107 views)

Reading material

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

By imani-stevens
(65 views)

Runtime Safety Analysis of Multithreaded Programs

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

By ilandere-wauters
(112 views)

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