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Least laxity first (LLF) is a real-time scheduling algorithm for periodic tasks. Slack time, or laxity, is the amount of time between when a task would complete if it started now and its next deadline. This is the size of the available scheduling window. Laxity can be expressed as
laxity = (deadline time) - (current time) - (processor time nedded)LLF assigns selects the task with the minimum laxity to execute next. If two or more tasks have the same minimum laxity value, they are serviced on a FCFS basis
a. Suppose a task currently has a laxity of t. By how long may the scheduler delay starting this task and still meet its deadline?
b. Suppose a task currently has a laxity of 0. What does this mean?
c. What does it mean if a task has negative laxity?
d. Consider a set of three periodic tasks with the execution profiles of Table 10.7a. Develop scheduling diagrams similar to those of Figure 10.5 for this set of tasks that compare rate monotonic, earliest deadline first, and LLF. Assume preemption may occur at 5-ms intervals. Comment on the results.
Figure 10.5
A two-pass assembler generally creates a symbol table during the first pass and finishes the complete translation from assembly language to machine instructions on the second.
Write a method called evenly Divisible that accepts two integer parameters and returns true if the first parameter is evenly divisible by the second, or vice versa, and false otherwise. Return false if either parameter is zero.
Will estimate emotional state of some user
Draw the initial query tree for each of these queries, and then show how the query tree is optimized by the algorithm outlined in Section 19.7.
Define a class called BlogEntry that could be used to store an entry for a Web log. The class should have instance variables to store the poster's username, text of the entry, and the date of the entry using the Date class.
Assume that you are part of a management team of a medium-size business that sells goods to consumers online. You know that your system was recently hacked, and that accounts and customer information may have been stolen. How do you respond to the si..
The student will learn how to provide management for projects that employ the methods of data gathering, fact-finding and input/output design. Using case problems, students will implement the techniques of system development and project management.
Write a program that tracks an investment for 1 person based on the input of an interest rate.The initial balance should be $2,000. The interest should be added to the balance and output in table format as shown in the supplied sample.
What is the largest file, in terms of the number of records, that you can sort with just four buffer pages in two passes? How would your answer change if you had 257 buffer pages?
Many studies analyse homogeneous information networks, e.g., social networks consisting of friends linked with friends. However, many other applications involve heterogeneous information networks, i.e., networks linking multiple types of object,
Accounting for prepaid expenses and unearned revenues. Hawaii-Blue beganbusiness on January 1 of the current year and offers deep-sea fishing trips to tourists.Tourists pay $125 in advance for an all-day outing off the coast of Maui.
Assume the processor scans keyboard every 100 ms. How many times will keyboard be checked in the 8-hour period?
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