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Linux System Memory Utilization (Doc ID 1514705.1)

Last updated on MAY 05, 2020

Applies to:

Linux OS - Version Oracle Linux 5.0 and later
Oracle Cloud Infrastructure - Version N/A and later
Information in this document applies to any platform.

Purpose

 Some Linux user may be confused by the Linux memory utilize: the memory used by application and the memory reported by 'free' command does not match.

Questions and Answers

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In this Document
Purpose
Questions and Answers
 Q1. How to read 'free' command output.
 A1. How to read 'free' command output.
 A1.1 From the perspective of Operating System
 A1.2 From the perspective of applications
 A1.3 More accurate
 Q2. How to forcefully free the cached memory.
 Q3. How the cached memory improve the system performance.
 Q4. How to get the memory usage by a specific process.
 Q5. When hugepage is enabled.
References


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