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Problem 1: Consider a computer system with the following five fixed-sized memory partitions (arranged In that order) and the memory requirements of the given four processes.
Memory Partitions
100KB
400KB
200KB
600KB
Process
P1
P2
P3
P4
Memory required
230 KB
370 KB
190 KB
595 KB
Problem 2: The following page table Is for a system with 16-bit virtual and physical addresses and with 4,096-byte pages. The reference bit is set to 1 when the page has been referenced. Periodically. a thread zeroes out all values of the reference bit. A dash for a page frame Indicates the page Is not In memory. The page-replacement algorithm Is localized LRU. and all numbers are provided In decimal.
Page
Page Frame
Reference Bit
0
9
1
2
14
3
10
4
-
5
13
6
8
7
15
11
12
o
a. Convert the following virtual addresses (in hexadecimal) to the equivalent physical addresses (provide answers in hexadecimal AND decimal). Also set the reference bit for the appropriate entry in the page table. (3)
i. Ox8C2C
ii. Ox00ED
iii. OxEA14
IV. 0x6901
V. Ox23A1 OxA999
b. Using the above addresses as a guide. Provide an example of logical addresses (in hexadecimal) that result in a page faults. (2)
c. From what set of page frames will the LRU page-replacement algorithm choose in resolving a page fault?
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