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DS_10_tut_3 - Protocol is for clock synchronization...

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CS3283 Distributed Systems Tutorial 3 Time Synchronization I Some points for further considerations … - The difference between sequence processes and concurrent processes - The importance of meeting the precedence constraints of a process - The relationships between process states and events - The importance of time synchronization - How to define “time”? - How to define a global clock and time for reference? - What are the differences between local clock and global clock? - List some important uses of local clock in a distributed system - What is the difference between relative time and absolute time? - How to adjust a software clock reading to maintain it within the required accuracy? - What are the difficulties in clock synchronization? - Explain the differences between internal clock synchronization and external clock synchronization - What are assumptions of the Cristian algorithm? - Compare the differences amongst the Cristian algorithm, the Berkeley algorithm and the Network Time
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Unformatted text preview: Protocol is for clock synchronization Readings : Dollimore: ch 11.1 to 11.3 and Tanenbaum: ch 5.1 Question 1 What are the two main purposes for clock synchronization? What are the design requirements of a system to synchronize the clocks in a distributed system? Question 2 Compare the tradeoffs between external and internal synchronization. Question 3 Assume min one-way time =12 time units. What is the time for P (denote as T(P)) after clock adjustment? What is the accuracy? m P (t=26) m S (t=36) t P =60 when m S is received Time server S Client P Use the Cristian Algorithm to calculate the time to be set at client P and to estimate the accuracy. Question 4 Use the NTP protocol to synchronize two servers A and B. The timestamps are shown in the following diagram. (a) What is the estimated time offset? (b) What is the accuracy according to (a)? Server B Server A 80 m(60) 12 m’ Time t t’ 9...
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DS_10_tut_3 - Protocol is for clock synchronization...

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