[Solved] Why does Linux consider reading files constant time after the first read, despite file size? — Ans: Because the OS uses page cache to store file data in memory | Linux CLI

Linux CLI - Viewing and Editing Files

Why does Linux consider reading files constant time after the first read, despite file size?

ABecause file permissions restrict read speed

BBecause Linux compresses files automatically

CBecause the OS uses page cache to store file data in memory

DBecause files are stored in fixed-size blocks on disk

Step-by-Step Solution

Solution:

Step 1: Understand OS page cache function
Linux stores recently read file data in RAM using page cache.
Step 2: Explain constant time reading
Subsequent reads access RAM, which is much faster than disk, making read time appear constant.
Final Answer:
Because the OS uses page cache to store file data in memory -> Option C
Quick Check:
Page cache enables constant time reads [OK]

Quick Trick: Page cache in RAM makes reads fast after first time [OK]

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