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Write a threaded program for solving a 15-puzzle. The program takes an initial position and keeps an open list of outstanding positions. This list is sorted on the "goodness" measure of the boards. A simple goodness measure is the Manhattan distance (i.e., the sum of x -displacement and y-displacement of every tile from where it needs to be). This open list is a work queue implemented as a heap. Each thread extracts work (a board) from the work queue, expands it to all possible successors, and inserts the successors into the work queue if it has not already been encountered. Use a hash table (from Problem 7.9) to keep track of entries that have been previously encountered. Plot the speedup of your program with the number of threads. You can compute the speedups for some reference board that is the same for various thread counts.
Problem 7.9 Change the locks to read-write locks in the hash table and use write locks only when inserting an entry into the linked list. Examine the performance of this program as a function of k. Compare the performance to that obtained using regular locks.
Why are (were) pirates difficult to eliminate? What to you believe about pirates as moder-day Robin Hoods? Who are getting advantages from piracy robberies?
A mobile sales force requires remote connectivity in order to access shared files and e-mail on the corporate network. All employees in the sales department have laptops equipped with ethernet adapters.
What is the purpose of a Network Operations Center (NOC)?Your company is using P2P technology to distribute software. Where is this software stored?Name at least three products that are often called flavors of UNIX.
The three stone blocks have weights of WA = 600 lb WB = 150 lb , and WC = 500 lb Determine the smallest horizontal force P that must be applied to block C in order to move this block µ's = 0.3.
The small publishing company you work for wants to create a new database for storing information about all of its author contracts. What factors will influence how you design the database?
Explain the sequences of signals that occur on address bus, control bus, and data bus when a simple microcomputer fetches an instruction.
Based on the following sequence of word addresses generated by the processor:1, 134, 212, 1, 135, 213, 162, 161, 2, 44, 41, 221a) Given a direct-mapped cache with 8 two-word blocks that is initially empty
Relevant systems analysis and design. Scholarly research should exist performed within the last few years that develop timely and appropriate procedures for an information systems analysis and design.
The Existing Event Research Report is an individual written assignment. Your Existing Event Research Report should strike a balance between description and analysis (i.e. the application of concepts learned from the lectures and text). The correct..
Give an example of each from your experience with data that you may have used.
Write a program that uses a two-dimensional array to store the highest and lowest temperatures for each month of the year. The program should output the average high, average low, and highest and lowest temperatures of the year. Your program must ..
How do you solve a system of linear equations by substitution? How do you solve a system of linear equations by elimination? Give an example of each method.
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