Computer Systems: A Programmer's Perspective (3rd Edition)
3rd Edition
ISBN: 9780134092669
Author: Bryant, Randal E. Bryant, David R. O'Hallaron, David R., Randal E.; O'Hallaron, Bryant/O'hallaron
Publisher: PEARSON
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Chapter 9, Problem 9.15HW
Determine the block sizes and header values that would result from the following sequence of malloc requests. Assumptions: (1) The allocator maintains double-word alignment and uses an implicit free list with the block format from Figure 9.35. (2) Block sizes are rounded up to the nearest multiple of 8 bytes.
| Request | Block size (decimal bytes) | Block header (hex) |
| malloc(3) | ______ | ______ |
| malloc(11) | ______ | ______ |
| malloc(20) | ______ | ______ |
| malloc(21) | ______ | ______ |
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SAME PARAMETERS: In the RENTALS table shown in fig
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VID
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Assuming spanned organization, how many blocks do you
estimate the RENTALS file is using at its current size?
400
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You are required to develop a data structure which keeps the record of the courses an ABCuniversity offers. A student shall only be enrolled in a course if its prerequisite is cleared.All the courses will have an address to its prerequisite course being offered and shall be calledits neighboring nodes. Course details should include course name and credit hours.A. Implement an insert function in a relevant data structure which store course details.Note: When a new course is inserted it must verify its previous course is a prerequisite ofthe inserted course.B. Implement a function which take user details and allocate him/her in Data structurecourse after verifying prerequisite courses.C. Implement a function in which we can check credit hours of any course.
Memory Allocation (20 minutes)
Assume you have a buddy allocator that initially has a single 512 byte free block. You cannot allocate more memory.
The first allocation is for 200 bytes. Describe how the allocation occurs with the buddy algorithm. State what's in the free list after the allocation.
How many bytes are lost to internal fragmentation after this first allocation?
Next, we deallocate the 200 byte allocation. Describe what happens. State what the free list looks like now.
Now, we get 4 different 100 byte allocations. You don't have to describe the process. However, state the free list at the end of all 4 allocations.
How many bytes are lost due to internal fragmentation after the 4 allocations?
Describe an approach you could take to fit another 100 byte allocation within your original 512 bytes. You can assume you can use your approach to allocate all 5 100 byte allocations
from scratch.
Chapter 9 Solutions
Computer Systems: A Programmer's Perspective (3rd Edition)
Ch. 9.2 - Prob. 9.1PPCh. 9.3 - Prob. 9.2PPCh. 9.6 - Prob. 9.3PPCh. 9.6 - Prob. 9.4PPCh. 9.8 - Practice Problem 9.5 (solution page 882) Write a C...Ch. 9.9 - Prob. 9.6PPCh. 9.9 - Prob. 9.7PPCh. 9.9 - Prob. 9.8PPCh. 9.9 - Prob. 9.9PPCh. 9.9 - Prob. 9.10PP
Ch. 9 - Prob. 9.11HWCh. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Repeat Problem 9.11 for the following address....Ch. 9 - Given an input file hello.txt that consists of the...Ch. 9 - Determine the block sizes and header values that...Ch. 9 - Prob. 9.16HWCh. 9 - Prob. 9.17HWCh. 9 - Prob. 9.18HWCh. 9 - Prob. 9.19HWCh. 9 - Write your own version of malloc and free, and...
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