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Operating-systems Questions Set 35:

Quiz Mode

What is the purpose of crontab?

crontab stands for "cron table"

It uses the job scheduler

It allocates resources to execute tasks

All of the above

Solution:

Which of the following is/are shared by all the threads in a process?
I. Program Counter
II. Stack
III. Address space
IV. Registers

I and II only

III only

IV only

III and IV only

Solution:

Which of the following is not an important part of security protection?

Strong passwords

Large amount of RAM to support antivirus

Scan for unauthorized programs in system directories

Audit log periodically

Solution:

Which of the following standard C library functions will always invoke a system call when executed from a single-threaded process in a UNIX/Linux operating system?
exit
malloc
sleep
strlen

1, 4

2, 3, 4

1, 3

1, 2, 3, 4

Solution:

The jacketing technique is used to convert a blocking system call into a non-blocking system call.

communicate between threads

create a new thread

terminate a thread

convert a blocking system call into non-blocking system call

Solution:

Which of the following statements about files in an operating system is true?

A file is a sequence of bits, bytes, lines, or records.

Files can be created, deleted, and modified.

Files can be accessed by their name.

All of the above.

Solution:

Which of the following statements about signals is not true?

Kernel may send signals internally

Processes may send each other signals

Each signal is maintained by a single bit

A field is updated in the signal table when the signal is sent

Solution:

The size of the physical address space of a processor is 2^P bytes. The word length is 2^W bytes. The capacity of cache memory is 2^N bytes. The size of each cache block is 2^M words. For a K-way set-associative cache memory, the length (in number of bits) of the tag field is

P − N − log₂K

P − N + log₂K

P − N − M − W − log₂K

P − N − M − W + log₂K

Solution:

Consider a non-pipelined processor operating at 2.5 GHz. It takes 5 clock cycles to complete an instruction. You are going to make a 5- stage pipeline out of this processor. Overheads associated with pipelining force you to operate the pipelined processor at 2 GHz. In a given program, assume that 30% are memory instructions, 60% are ALU instructions and the rest are branch instructions. 5% of the memory instructions cause stalls of 50 clock cycles each due to cache misses and 50% of the branch instructions cause stalls of 2 cycles each. Assume that there are no stalls associated with the execution of ALU instructions. For this program, the speedup achieved by the pipelined processor over the non-pipelined processor (round off to 2 decimal places) is

Operating-systems Questions Set 35:

What is the purpose of crontab?

Solution:

Which of the following is/are shared by all the threads in a process?
I. Program Counter
II. Stack
III. Address space
IV. Registers

Solution:

Which of the following is not an important part of security protection?

Solution:

Which of the following standard C library functions will always invoke a system call when executed from a single-threaded process in a UNIX/Linux operating system?
exit
malloc
sleep
strlen

Solution:

The jacketing technique is used to convert a blocking system call into a non-blocking system call.

Solution:

Which of the following statements about files in an operating system is true?

Solution:

Which of the following statements about signals is not true?

Solution:

The size of the physical address space of a processor is 2^P bytes. The word length is 2^W bytes. The capacity of cache memory is 2^N bytes. The size of each cache block is 2^M words. For a K-way set-associative cache memory, the length (in number of bits) of the tag field is

Solution:

Solution:

Related Question Sets:

Related Topics:

Operating-systems Questions Set 35:

What is the purpose of crontab?

Solution:

Which of the following is/are shared by all the threads in a process?I. Program CounterII. StackIII. Address spaceIV. Registers

Solution:

Which of the following is not an important part of security protection?

Solution:

Which of the following standard C library functions will always invoke a system call when executed from a single-threaded process in a UNIX/Linux operating system?exitmallocsleepstrlen﻿

Solution:

The jacketing technique is used to convert a blocking system call into a non-blocking system call.

Solution:

Which of the following statements about files in an operating system is true?

Solution:

Which of the following statements about signals is not true?

Solution:

The size of the physical address space of a processor is 2P bytes. The word length is 2W bytes. The capacity of cache memory is 2N bytes. The size of each cache block is 2M words. For a K-way set-associative cache memory, the length (in number of bits) of the tag field is

Solution:

Solution:

Related Question Sets:

Related Topics:

Which of the following is/are shared by all the threads in a process?
I. Program Counter
II. Stack
III. Address space
IV. Registers

Which of the following standard C library functions will always invoke a system call when executed from a single-threaded process in a UNIX/Linux operating system?
exit
malloc
sleep
strlen

The size of the physical address space of a processor is 2^P bytes. The word length is 2^W bytes. The capacity of cache memory is 2^N bytes. The size of each cache block is 2^M words. For a K-way set-associative cache memory, the length (in number of bits) of the tag field is