CS4961 Parallel Programming Lecture 2: Introduction to Parallel ...
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CS4961 Parallel Programming Lecture 2: Introduction to Parallel ...
Aug 31, 2010 ... Introduction to Parallel. Algorithms. Mary Hall. August 26, 2010. 1. Homework 1 –
Due 10:00 PM, Wed., Sept. 1. • To submit your homework:.
8/31/10
Homework 1 – Due 10:00 PM, Wed., Sept. 1 • To submit your homework:
CS4961 Parallel Programming
- Submit a PDF file - Use the “handin” program on the CADE machines - Use the following command: “handin cs4961 hw1 ”
Lecture 2: Introduction to Parallel Algorithms
Problem 1: - What are your goals after this year and how do you anticipate this class is going to help you with that? Some possible answers, but please feel free to add to them. Also, please write at least one sentence of explanation. - A job in the computing industry - A job in some other industry where computing is applied to real-world problems - As preparation for graduate studies - Intellectual curiosity about what is happening in the computing field
Mary Hall August 26, 2010 08/26/2010
CS4961
1
Homework 1
08/26/2010
- Other
CS4961
2
Homework 1, cont.
Problem 2:
Problem 3 (see supplemental notes for definitions):
(a) Provide pseudocode (as in the book and class notes) for a correct and efficient parallel implementation in C of the parallel prefix computation (see Fig. 1.4 on page 14). Assume your input is a vector of n integers, and there are n/2 processors. Each processor is executing the same thread code, and the thread index is used to determine which portion of the vector the thread operates upon and the control. For now, you can assume that at each step in the tree, the threads are synchronized. (b) The structure of this and the tree-based parallel sums from Figure 1.3 are similar to the parallel sort we did with the playing cards on Aug. 24. In words, describe how you would modify your solution of (a) above to derive the parallel sorting implementation.
Loop reversal is a transformation that reverses the order of the iterations of a loop. In other words, loop reversal transforms a loop with header for (i=0; i=0; i--) Is loop reversal a valid reordering transformation on the “i” loop in the following loop nest? Why or why not? for (j=0; j
