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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 asked in Operating System Feb 15

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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 asked in CO and Architecture Dec 2, 2022

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How many cycle per second are spent on I/O if polling is used with Interrupts?

Manpreet Saluja asked in Computer Networks Nov 7, 2022

by Manpreet Saluja

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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 asked in Computer Networks Oct 18, 2022

by eskaykaushik

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1 vote

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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

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Basic COA
Why ALU can’t accept operand directly from input/output devices ?

kanakjyoti asked in CO and Architecture Sep 1, 2022

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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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

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1 answer

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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

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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

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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

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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

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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

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1 answer

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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

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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

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1 answer

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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

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1 answer

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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

2 votes

1 answer

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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

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Recent questions tagged input-output