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# hw3 - P1 P2 P3 P1.1 P1.2 P1.3 P1.4 P1.5 P2.1 P2.2 P2.3 P2.4...

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CSE586 (Spring 2010): Homework 3 Due by Feb 12, in class. P1 P2 P3 P1.1 P1.2 P1.3 P1.4 P1.5 P2.1 P2.2 P2.3 P2.4 P2.5 P3.1 P3.2 P3.3 P3.4 P3.5 Figure 1: Timeline for P1, P2, and P3 1. (70 points) Answer the following questions using Figure 1. 1. (10 points) List all the events e such that P1.1 “happened before” e . In addition list all the events f that are “concurrent” with P2.2. 2. (20 points) Assign timestamps to all the events in accordance with the logical clock algorithm. Initially, all the local clocks begin with 0. (Mark on Figure 1.) 3. (40 points) Assign timestamps to all the events in accordance with the vector clock algorithm. Initially, all the local clocks begin with 0. (Mark on Figure 2 below.)

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Unformatted text preview: P1 P2 P3 P1.1 P1.2 P1.3 P1.4 P1.5 P2.1 P2.2 P2.3 P2.4 P2.5 P3.1 P3.2 P3.3 P3.4 P3.5 Figure 2: Timeline for P1, P2, and P3 1 2. (30 points) Consider an event A on P1, and an event B on P2, and an event C on P3. 1. Assume that logical clocks was used, and the time.A=5, time.B=5, and time.C=10. What can you say about the happened-before relationships between events A, B, and C. 2. Assume that vector clocks was used, and the time.A=[5,5,5], time.B=[2,5,5], and time.C=[2,7,10]. What can you say about the happened-before relationships between events A, B, and C. 2...
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hw3 - P1 P2 P3 P1.1 P1.2 P1.3 P1.4 P1.5 P2.1 P2.2 P2.3 P2.4...

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