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Concurrency and Scheduling (part 2)

Dive into the complexities of concurrency and scheduling in distributed systems. Explore topics such as event ordering, clock synchronization, and examples by Leslie Lamport. Understand how to manage global time and handle concurrent events efficiently.

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Concurrency and Scheduling (part 2)

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  1. Concurrency and Scheduling (part 2) CPS210 Spring 2006

  2. Papers • Time, clocks, and the ordering of events in a distributed system • Leslie Lamport

  3. Example P Q R p1 q1 r1 q2 p2 r2 q3 q4 p3 r3 q5 q6 p4 r4 q7

  4. If C(a) < C(b) does a  b? P Q R p1 q1 r1 q2 p2 r2 q3 q4 p3 r3 q5 q6 p4 r4 q7 p2, p3 concurrent with q3 Can’t assign same global time because p2p3

  5. Example with tick marks P Q R p1 q1 r1 1 2 q2 p2 3 r2 q3 p3 q4 4 r3 5 q5 6 7 q6 p4 8 r4 q7

  6. Example with straight tick marks P Q R p1 q1 r1 1 2 p2 q2 3 r2 p3 4 q3 5 q4 6 q5 r3 7 q6 p4 8 q7 r4

  7. Exchanging clocks P Q R t=1 p1 q1 t=1 r1 t=1 q2 t=2 p2 t=2 r2 t=2 q3 t=3 q4 t=4 p3 t=3 r3 t=5 q5 t=5 q6 t=6 t=6 p4 r4 t=6 q7 t=7

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