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UBI529 Distributed Algorithms

UBI529 Distributed Algorithms. Global State of Distributed Systems. Motivation. Goal: Take a snapshot of the global computation A snapshot of local states on n processes taken at exactly the same time T wo terms “global state” and “global snapshot” Useful for debugging

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Motivation

Motivation. On UNIX, each computing task is represented by a process . UNIX runs many tasks seemingly at the same time One can run multiple commands and carry out multiple tasks at a time E ach process receives a little slice of CPU time by the scheduler. What is a process ?.

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Chapter 9 Global Snapshot

Chapter 9 Global Snapshot. The mystery of the missing dollars. Picture taken at A - $400 A sends $100 to B Picture taken at B - $400 Total is $800. Send $100. B. A. $300. $400. Global Snapshot Problem. Determine the global system state (e.g. the total money )

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