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25-26 CS2850: Operating Systems

25-26 CS2850: Operating Systems

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For each of these statements, select the file implementation it applies to:

Only part of a disk block is used to store file data

Its occupation in main memory is proportional to the number of open files

It may lead to fragmentation

Its occupation in main memory is proportional to the size of the partition

Accessing a specific byte within a file is slow

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Select the incorrect statement about segmentation:

Segments can be shared among processes

The content of a segment may change during execution

All segments of a process share the same page table

Segmentation allows different memory areas to have different protection levels

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Consider the FIFO, the second-chance and the clock replacement algorithms. What happens in each of these cases if the oldest page has R = 1?

FIFO

Clock

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This question is about the working set algorithm. Suppose the current virtual time is 360ms, and τ = 50ms. The page currently being examined has:

Time of last use = 300ms

R = 1

What happens to this page?

It is evicted, as its age is bigger than τ

It is kept, and its time of last use is set to 360ms

It is kept, but is considered a candidate for eviction if no other suitable page is found

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Consider the page table in the following picture, translating 16 bit addresses to 15 bit ones:

Which physical address is the virtual address 36899 translated to?

None, as a page fault is generated

20515

24611

36899

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Select all the correct statements about virtual memory:

Virtual memory can be larger than physical memory

All pages of a program are always in main memory

a page is a contiguous range of addresses

Address referenced by a program are used to directly access physical memory

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Connect library names with their description.

<math.h>

<string.h>

<errno.h>

<stdio.h>

<unistd.h>

<stdlib.h>

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Why has C been called a system programming language?

C is not tied to any operating system

C deals with simple objects: characters, addresses, numbers

C is useful for writing operating systems or compilers

C provides a better, simpler, and cleaner model of the computer

C is a general-purpose programming language

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Which of the following statements about C is true?

C has built-in read- and write-statements

C has a dynamical memory allocation facility

C allows operation between composite objects such as strings of characters

C has single-thread control flow operations

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This question is about free memory handling. For each of the following statements, select the algorithms to which it applies:

It selects the first hole in the list that fits the process

It selects the first hole in the list that fits the process, after the one used for the previous process

It selects the biggest hole in the list that fits the process

It keeps separate lists for processes and holes

It selects the smallest hole in the list that fits the process

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