I/O scheduling and buffering in Operating Systems - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to identify the main purpose of buffering in I/O operations.

Operating Systems

Buffering helps to [1] data between the device and the process.

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Astore

Btransfer

Cdelete

Dencrypt

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing buffering with data deletion or encryption.

Buffering temporarily holds data to transfer it smoothly between the device and the process, preventing speed mismatches.

2fill in blank

medium

Complete the code to name a common I/O scheduling algorithm that reduces seek time.

Operating Systems

The [1] algorithm schedules disk I/O requests by moving the head in one direction.

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AFIFO

BPriority

CRound Robin

DSCAN

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing FIFO which does not optimize seek time.

The SCAN algorithm moves the disk arm in one direction servicing requests, reducing seek time compared to FIFO.

3fill in blank

hard

Fix the error in the statement about double buffering.

Operating Systems

Double buffering uses two buffers to [1] data transfer and processing.

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Aslow down

Bstop

Coverlap

Dignore

Attempts:

3 left

💡 Hint

Common Mistakes

Thinking double buffering slows down the process.

Double buffering allows overlapping data transfer and processing to improve efficiency.

4fill in blank

hard

Fill both blanks to complete the dictionary comprehension that maps I/O scheduling algorithms to their key feature.

Operating Systems

{alg: alg[1] for alg in ['FIFO', 'SSTF', 'SCAN'] if alg [2] 'SSTF'}

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A.lower()

B==

C!=

D.upper()

Attempts:

3 left

💡 Hint

Common Mistakes

Using '==' instead of '!=' in the filter.

The code converts algorithm names to lowercase and filters out 'SSTF' using '!='.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps buffer names to their sizes if size is greater than 1024.

Operating Systems

{ [1]: [2] for [3] in buffers if buffers[[3]] > 1024 }

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Aname

Bsize

Dbuffer

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

The comprehension uses 'name' as key, 'size' as value, and iterates over 'name' in buffers.