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User `JEET
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0
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121
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?
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Operating System
Oct 29, 2019
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tanenbaum
operating-system
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memory-mapped
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122
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?
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Operating System
Oct 29, 2019
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123
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?
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Operating System
Oct 29, 2019
378
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tanenbaum
operating-system
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disk
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124
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 18 (Page No. 431)
A disk rotates at $7200$ RPM. It has $500$ sectors of $512$ bytes around the outer cylinder. How long does it take to read a sector?
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Operating System
Oct 29, 2019
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125
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.
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Operating System
Oct 29, 2019
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126
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 21 (Page No. 431)
A RAID can fail if two or more of its drives crash within a short time interval. Suppose that the probability of one drive crashing in a given hour is $p.$ What is the probability of a $k$-drive RAID failing in a given hour?
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Operating System
Oct 29, 2019
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tanenbaum
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disk
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0
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127
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 27 (Page No. 431)
If a disk has double interleaving, does it also need cylinder skew in order to avoid missing data when making a track-to-track seek? Discuss your answer.
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Operating System
Oct 29, 2019
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128
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 26 (Page No. 431)
If a disk controller writes the bytes it receives from the disk to memory as fast as it receives them, with no internal buffering, is interleaving conceivably useful? Discuss your answer.
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Operating System
Oct 29, 2019
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10
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129
Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 25 (Page No. 334)
The beginning of a free-space bitmap looks like this after the disk partition is first formatted$:\: 1000\: 0000\: 0000\: 0000$ (the first block is used by the root directory). The system always searches for free blocks starting ... five blocks. File $A$ is deleted. File $C$ is written, using eight blocks. File $B$ is deleted.
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Operating System
Oct 29, 2019
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memory-management
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130
Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 10 (Page No. 333)
Consider the directory tree of Fig. $4-8.$ If /usr/jim is the working directory, what is the absolute path name for the file whose relative path name is ../ast/x?
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Operating System
Oct 29, 2019
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131
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 14 (Page No. 430)
In which of the four I/O software layers is each of the following done. Computing the track, sector, and head for a disk read. Writing commands to the device registers. Checking to see if the user is permitted to use the device. Converting binary integers to ASCII for printing.
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Operating System
Oct 29, 2019
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132
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 16 (Page No. 431)
Why are output files for the printer normally spooled on disk before being printed?
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Operating System
Oct 29, 2019
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133
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 17 (Page No. 431)
How much cylinder skew is needed for a $7200$-RPM disk with a track-to-track seek time of $1\: msec$? The disk has $200$ sectors of $512$ bytes each on each track.
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Operating System
Oct 29, 2019
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134
Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 23 (Page No. 334)
Consider a $4-TB$ disk that uses $4-KB$ blocks and the free-list method. How many block addresses can be stored in one block?
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Operating System
Oct 29, 2019
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tanenbaum
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135
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 19 (Page No. 431)
Calculate the maximum data rate in bytes/sec for the disk described in the previous problem.
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Operating System
Oct 28, 2019
351
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136
Andrew S. Tanenbaum (OS) Edition 4 Exercise 3 Question 45 (Page No. 259)
Explain the difference between internal fragmentation and external fragmentation. Which one occurs in paging systems? Which one occurs in systems using pure segmentation?
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Operating System
Oct 28, 2019
902
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tanenbaum
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paging
fragmentation
segmentation
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137
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 23 (Page No. 431)
How many pebibytes are there in a zebibyte?
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Operating System
Oct 28, 2019
187
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easy
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138
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?
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Operating System
Oct 28, 2019
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139
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?
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Operating System
Oct 28, 2019
580
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unix
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2
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140
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 31 (Page No. 432)
Disk requests come in to the disk driver for cylinders $10, 22, 20, 2, 40, 6,$ and $38,$ in that order. A seek takes $6\: msec$ per cylinder. How much seek time is needed for First-come, first served. Closest cylinder next. Elevator algorithm (initially moving upward). In all cases, the arm is initially at cylinder 20.
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Operating System
Oct 28, 2019
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141
Andrew S. Tanenbaum (OS) Edition 4 Exercise 5 Question 28 (Page No. 431)
Consider a magnetic disk consisting of $16$ heads and $400$ cylinders. This disk has four $100$-cylinder zones with the cylinders in different zones containing $160, 200, 240.$ and $280$ sectors, respectively. ... disk rotates at $7200$ RPM. Calculate the disk capacity, optimal track skew, and maximum data transfer rate.
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Operating System
Oct 28, 2019
2.9k
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cylinders
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142
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?
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Operating System
Oct 28, 2019
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tanenbaum
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interrupts
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143
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 $5023.$
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Operating System
Oct 28, 2019
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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?
answered
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Operating System
Oct 28, 2019
215
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145
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.)
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Operating System
Oct 28, 2019
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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?
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Operating System
Oct 28, 2019
281
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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?
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Operating System
Oct 28, 2019
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148
Andrew S. Tanenbaum (OS) Edition 4 Exercise 6 Question 1 (Page No. 465)
Give an example of a deadlock taken from politics.
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Operating System
Oct 28, 2019
213
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 6 Question 8 (Page No. 466)
Is it possible that a resource deadlock involves multiple units of one type and a single unit of another? If so, give an example.
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Operating System
Oct 28, 2019
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Andrew S. Tanenbaum (OS) Edition 4 Exercise 4 Question 35 (Page No. 335)
Consider a disk that has $10$ data blocks starting from block $14$ through $23.$ Let there be $2$ files on the disk$: f1$ and $f2.$ The directory structure lists that the first data blocks of $f1$ and $f2$ are ... the above notation, $(x, y)$ indicates that the value stored in table entry $x$ points to data block $y.$
answered
in
Operating System
Oct 28, 2019
524
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tanenbaum
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file-allocation-table
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