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Motivating some advanced problems (but first some statistics about lab 2)

Motivating some advanced problems (but first some statistics about lab 2). Lecture 21. Messages to the server based on hour of the day (0-1, 1-2, …, 23-24). What day of the week is busiest? (1: Monday, 7: Sunday). Messages since 9/2/2013 (=day 1). 23 rd April. 4 th March. The problems.

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Motivating some advanced problems (but first some statistics about lab 2)

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  1. Motivating some advanced problems(but first some statistics about lab 2) Lecture 21

  2. Messages to the server based on hour of the day (0-1, 1-2, …, 23-24)

  3. What day of the week is busiest?(1: Monday, 7: Sunday)

  4. Messages since 9/2/2013 (=day 1) 23rd April 4th March

  5. The problems • When is it best to execute two tasks on one machine as opposed to one task on one machine + communication (data transfer) and computation on another? • How to design random values, which are not uniform? E.g., two-digit integer where the probability is: 0-9 (90%) and 10-99 (10%) • How to compute the average of streamed data? (related to lab exercise 3, where you have to compute the average over large values) • Split the following loop, so that each of 4 threads takes the same amount of computation. Rewrite, in terms of t, where t is between 0 and 3. for(i=0;i<1000;i++) { some_computation_on_i; } Marking session for the lab on May 7th all your lab work should be submitted by then!

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