CSCE3600 - Exam 1

Question 1

unix command: concatenates files and print to standard output

Answer 1

cat

Question 2

unix command: file viewer

Answer 2

less

Question 3

unix command: locate a command

Answer 3

which

Question 4

unix command: prints the groups a user is in

Answer 4

groups

Question 5

unix command: prints lines matching to a pattern

Answer 5

grep

Question 6

unix command: search for a file in a directory

Answer 6

find

Question 7

unix command: clears the terminal screen

Answer 7

clear

Question 8

unix command: prints information about a user

Answer 8

finger

Question 9

unix command: shows who is logged in

Answer 9

who

Question 10

unix command: identifies the current user

Answer 10

whoami

Question 11

List 7 processes associated with Process Control Block (PCB)

Answer 11

process state, program counter, cpu registers, cpu scheduling information, memory-management info, accounting info, I/O status info

Question 12

program in execution, which forms the basis of all computation

Answer 12

process

Question 13

the context (information/data) maintained for an executing program - intuitively the abstraction of a physical processor

Answer 13

process

Question 14

Process: containing temporary data (function parameters, return addresses, local variables)

Answer 14

stack

Question 15

process: containing global variables

Answer 15

data section

Question 16

process: containing memory dynamically allocated during run time

Answer 16

heap

Question 17

how does unix view everything?

Answer 17

as files

Question 18

what are the three standard unix/linux files?

Answer 18

stdin, stdout, stderr

Question 19

what is stored in the user level context (4)

Answer 19

code, data, stack, heap

Question 20

preserve the literal value of each character enclosed within the quotes

Answer 20

single quotes (‘ ‘)

Question 21

remove the special meaning from a single character

Answer 21

backslash ( \ )

Question 22

preserves the literal value of all characters within the quotes

Answer 22

double quotes (“ “)

Question 23

draw the process state diagram

Answer 23

new, running, waiting, ready, terminated

Question 24

selects which processes should be brought into the ready queue. controls the degree of multiprogramming. invoked infrequently

Answer 24

long-term scheduler

Question 25

selects which process should be executed next and allocates cpu. invoked frequently

Answer 25

short-term scheduler

Question 26

when cpu switches to another process the system must

Answer 26

save the state of the old process and load the saved states for the new process

Question 27

if child exits before parent or if no parent waiting, then terminated process is a

Answer 27

zombie

Question 28

if parent exits before child or if parent terminated, processes are

Answer 28

orphans

Question 29

``` using SJF draw chart and calculate waiting time and turn around time: AT:BT P1 = 0:7 P2 = 2:4 P3 = 4:1 P4 = 5:4 ```

Answer 29

chart: P1 - P3 - P2 - P4 WT = 4 TAT = 8

Question 30

only one processor accesses the system data structures, alleviating the need for data sharing

Answer 30

asymmetric multiprocessing

Question 31

each processor is self-scheduling, all processes in common ready queue, or each has its own private queue of ready processes

Answer 31

symmetric multiprocessing

Question 32

process must voluntarily relinquish by terminating or by making a system call

Answer 32

non-preemptive

Question 33

yank the cpu away from the currently executing process when a higher priority process is ready

Answer 33

preemptive

Question 34

list preemptive algorithms

Answer 34

shortest-remaining-time-first round-robin multi-level feedback queue

Question 35

fraction (%) of time that cpu is busy

Answer 35

cpu utilization

Question 36

number of job completions (processes) per unit of time

Answer 36

throughput

Question 37

the interval from the time of submission of a process to the time of completion

Answer 37

turnaround time

Question 38

sum of the periods spent waiting in the ready queue

Answer 38

waiting time

Question 39

time of submission to the time the first response is produced

Answer 39

response time

Question 40

list 3 resource sharing options for parents and children

Answer 40

1) parent and children share all resources 2) children share subset of parent's resources 3) parent and child share no resources

Question 41

list 2 address space options for parents and children

Answer 41

1) child duplicate of parent | 2) child has no program loaded into it

Question 42

list 2 execution options for parent and child

Answer 42

1) parent and child execute concurrently | 2) parent waits until children terminate