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Recent questions tagged input-output
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Andrew S. Tanenbaum - Modern Operating Systems
Measurements of a certain system have shown that the average process runs for a time T before blocking on I/O. A process switch requires a time S, which is effectively wasted (overhead). For round-robin scheduling with quantum Q, giv e a formula for the CPU efficiency for each of the ... ) Q = ∞ (b) Q > T (c) S < Q < T (d) Q = S (e) Q nearly 0
arjunwkb
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in
Operating System
Feb 15
by
arjunwkb
141
views
operating-system
cpu
input-output
2
votes
2
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2
I/O Modes | Process State Transition | COA & OS
MSQ A ‘Running’ process is surely put into ‘Blocked/Wait’ state during while requesting for an I/O, in which of the following I/O modes? Synchronous I/O Asynchronous I/O Interrupt Driven I/O DMA
Souvik33
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in
CO and Architecture
Dec 2, 2022
by
Souvik33
270
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operating-system
process-scheduling
co-and-architecture
dma
interrupts
input-output
multiple-selects
0
votes
0
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3
How many cycle per second are spent on I/O if polling is used with Interrupts?
Manpreet Saluja
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in
Computer Networks
Nov 7, 2022
by
Manpreet Saluja
82
views
co-and-architecture
clock-cycles
input-output
0
votes
0
answers
4
Trishna's GATE CSE
In a programmed I/O technique, the processor is stuck in a wait loop doing status checking of an I/O device. To increase efficiency, the I/O software could be writ- ten so that the processor periodically checks the status of the device. If the device is not ready, ... The printing rate is slowed to 5 CPS (C) The printing rate is at 10 CPS only (D) The printing rate is at 20 CPS
eskaykaushik
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in
Computer Networks
Oct 18, 2022
by
eskaykaushik
174
views
operating-system
input-output
loop
1
vote
1
answer
5
Test Series
Question : Consider a Device which operates with 20 MBPS operating speed.The device is operating on Programmed control mode of I/O and it has to transfer data of 20 B from it the data is transferred byte wise .Size of status register is 2 Bytes.total time needed to perform the data transfer is --------(microseconds)
lalitver10
asked
in
CO and Architecture
Sep 16, 2022
by
lalitver10
179
views
co-and-architecture
input-output
test-series
0
votes
0
answers
6
Basic COA
Why ALU can’t accept operand directly from input/output devices ?
kanakjyoti
asked
in
CO and Architecture
Sep 1, 2022
by
kanakjyoti
54
views
co-and-architecture
input-output
2
votes
2
answers
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what is the ouput of this c code ?
// C/C++ program to demonstrate return value // of printf() #include <stdio.h> int main() { long int n = 123456789; printf("While printing "); printf(", the value returned by printf() is : %d", printf("%ld" ... : 9 123456789 but this prints While printing 123456789, the value returned by printf() is : 9 why this is happens ?
ykrishnay
asked
in
Programming
May 23, 2022
by
ykrishnay
340
views
programming-in-c
programming
input-output
0
votes
2
answers
8
UGC NET CSE | October 2020 | Part 2 | Question: 65
Match $\text{List I}$ with $\text{List II}$ ... $ $A-II, B-IV, C-I, D-III$ $A-IV, B-III, C-II, D-I$ Match $
go_editor
asked
in
Operating System
Nov 20, 2020
by
go_editor
787
views
ugcnetcse-oct2020-paper2
operating-system
input-output
1
vote
4
answers
9
UGC NET CSE | January 2017 | Part 2 | Question: 38
Match the following w.r.t Input/Output management : ...
go_editor
asked
in
Operating System
Mar 24, 2020
by
go_editor
555
views
ugcnetjan2017ii
operating-system
input-output
0
votes
0
answers
10
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 57 (Page No. 434)
Write a program to implement multiple timers using a single clock. Input for this program consists of a sequence of four types of commands ... , and Clock header. Your program should also print out a statement whenever it is time to raise a signal.
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
117
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
11
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 56 (Page No. 434)
Write a program to implement the three disk-arm scheduling algorithms. Write a driver program that generates a sequence of cylinder numbers $(0–999)$ at random, runs the three algorithms for this sequence and prints out the total distance (number of cylinders) the arm needs to traverse in the three algorithms.
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
347
views
tanenbaum
operating-system
input-output
disk-scheduling
descriptive
0
votes
0
answers
12
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 55 (Page No. 434)
Write a program that simulates stable storage. Use two large fixed-length files on your disk to simulate the two disks.
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
135
views
tanenbaum
operating-system
input-output
descriptive
0
votes
0
answers
13
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 54 (Page No. 434)
A notebook computer is set up to take maximum advantage of power saving features including shutting down the display and the hard disk after periods of inactivity. A user sometimes runs UNIX programs in text mode, and ... She is surprised to find that battery life is significantly better when she uses text-only programs. Why?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
140
views
tanenbaum
operating-system
input-output
unix
descriptive
0
votes
1
answer
14
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 53 (Page No. 434)
If a CPU's maximum voltage, $V,$ is cut to $V/n,$ its power consumption drops to $1/n^{2}$ of its original value and its clock speed drops to $1/n$ of its original value. Suppose that a user ... is the corresponding energy saving in percent compared to not cutting the voltage? Assume that an idle CPU consumes no energy at all.
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
270
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
15
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 52 (Page No. 434)
Describe two advantages and two disadvantages of thin client computing?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
174
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
16
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 51 (Page No. 434)
It has been observed that a thin-client system works well with a $1$-Mbps network in a test. Are any problems likely in a multiuser situation? (Hint: Consider a large number of users watching a scheduled TV show and the same number of users browsing the World Wide Web.)
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
151
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
17
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 50 (Page No. 434)
A thin-client terminal is used to display a Web page containing an animated cartoon of size $400\: \text{pixels} \times 160\: \text{pixels}$ running at $10\: \text{frames/sec.}$ What fraction of a $100$-Mbps Fast Ethernet is consumed by displaying the cartoon?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
180
views
tanenbaum
operating-system
input-output
descriptive
0
votes
0
answers
18
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 49 (Page No. 433 - 434)
In the text we gave an example of how to draw a rectangle on the screen using the Windows GDI: Rectangle(hdc, xleft, ytop, xright, ybottom); Is there any real need for the first parameter (hdc), and if so, what? After all, the coordinates of the rectangle are explicitly specified as parameters.
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
105
views
tanenbaum
operating-system
input-output
descriptive
0
votes
0
answers
19
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 48 (Page No. 433)
In Fig. 5-36 there is a class to RegisterClass. In the corresponding $X$ Window code, in Fig. 5-34, there is no such call or anything like it. Why not?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
203
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
20
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 47 (Page No. 433)
Assuming that it takes $2\: nsec$ to copy a byte, how much time does it take to completely rewrite the screen of an $80\: \text{character} \times \text{25}$ line text mode memory-mapped screen? What about a $1024 \times 768$ pixel graphics screen with $24$-bit color?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
357
views
tanenbaum
operating-system
input-output
memory-mapped
descriptive
0
votes
1
answer
21
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 46 (Page No. 433)
One way to place a character on a bitmapped screen is to use BitBlt from a font table. Assume that a particular font uses characters that are $16 24$ pixels in true RGB color. How much font table space does each ... a byte takes $100\: nsec,$ including overhead, what is the output rate to the screen in characters/sec?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
260
views
tanenbaum
operating-system
input-output
descriptive
0
votes
0
answers
22
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 45 (Page No. 433)
The primary additive colors are red, green, and blue, which means that any color can be constructed from a linear superposition of these colors. Is it possible that someone could have a color photograph that cannot be represented using full $24$-bit color?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
103
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
23
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 44 (Page No. 433)
The designers of a computer system expected that the mouse could be moved at a maximum rate of $20\: cm/sec.$ If a mickey is $0.1 \:mm$ and each mouse message is $3$ bytes, what is the maximum data rate of the mouse assuming that each mickey is reported separately?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
165
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
24
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 43 (Page No. 433)
A user at a terminal issues a command to an editor to delete the word on line $5$ occupying character positions $7$ through and including $12.$ Assuming the cursor is not on line $5$ when the command is given, what ANSI escape sequence should the editor emit to delete the word?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
168
views
tanenbaum
operating-system
input-output
descriptive
1
vote
0
answers
25
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 42 (Page No. 433)
After receiving a DEL (SIGINT) character, the display driver discards all output currently queued for that display. Why?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
201
views
tanenbaum
operating-system
input-output
descriptive
0
votes
1
answer
26
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 41 (Page No. 433)
A bitmap terminal contains $1600$ by $1200$ pixels. To scroll a window, the CPU (or controller) must move all the lines of text upward by copying their bits from one part of the video RAM to another. If a particular ... ? Putting a character on the screen takes $5\: \mu sec.$ How many lines per second can be displayed?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
276
views
tanenbaum
operating-system
input-output
disk
descriptive
0
votes
1
answer
27
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 40 (Page No. 433)
Many versions of UNIX use an unsigned $32$-bit integer to keep track of the time as the number of seconds since the origin of time. When will these systems wrap around (year and month)? Do you expect this to actually happen?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
451
views
tanenbaum
operating-system
input-output
disk
unix
descriptive
0
votes
1
answer
28
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 39 (Page No. 433)
A system simulates multiple clocks by chaining all pending clock requests together as shown in Fig. 5-30. Suppose the current time is $5000$ and there are pending clock requests for time $5008, 5012, 5015, 5029,4$ ... $5017$ for $5033.$ Show the values of Clock header, Current time and Next signal at time $5023.$
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
613
views
tanenbaum
operating-system
input-output
disk
descriptive
0
votes
1
answer
29
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 38 (Page No. 432)
A computer uses a programmable clock in square-wave mode. If a $500\:MHz$ crystal is used, what should be the value of the holding register to achieve a clock resolution of a millisecond (a clock tick once every millisecond)? $100$ microseconds?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
1.6k
views
tanenbaum
operating-system
input-output
disk
descriptive
2
votes
1
answer
30
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 37 (Page No. 432)
The clock interrupt handler on a certain computer requires $2\: msec$ (including process switching overhead) per clock tick. The clock runs at $60\: Hz.$ What fraction of the CPU is devoted to the clock?
Lakshman Bhaiya
asked
in
Operating System
Oct 28, 2019
by
Lakshman Bhaiya
1.2k
views
tanenbaum
operating-system
input-output
interrupts
descriptive
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