Improve System Performance: Clear Linux Cache Easily Bash Script

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Improve System Performance: Clear Linux Cache Easily Bash Script

How to Improve System Performance: Clear Linux Cache Easily Bash Script

Keeping your Linux computer running fast is important. Sometimes Clear Linux Cache,  memory gets full because of cached files. This can slow down your system. This article will show you how to clear the cache easily using a simple script.

Clear Linux Cache Easily Bash Script Objective :

  • Understand why clearing the cache is helpful.
  • How to automate clearing the cache with a script.
  • Make your system run faster by managing memory better.

Clear Linux Cache Easily Bash Script Prerequisites :

  • Basic knowledge of Linux commands.
  • Permission to run system commands as root or with sudo.

Notes :

  • Please change the threshold values according to your requirements.
  • Understand each command before executing the script to ensure it fits your environment and requirements.
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Example output :

Stage Output
Before Clearing Cache Memory usage: 85%
total used free shared buff/cache available
2000 1700 100 50 200 150
After Clearing Cache Memory usage: 50%
total used free shared buff/cache available
2000 1000 800 50 200 1200

Script :

#!/bin/bash
#################################################################
# Date: 15-July-2024
# Author: Krishna Tummeti
# Website: Tech Base Hub
# Purpose: Improve System Performance: Clear Linux Cache Easily Bash Script
#################################################################
# Get memory usage as a percentage
mem_usage=$(free -m | awk 'NR==2 {print int($3*100/$2)}')
# Set threshold 
threshold=80
# Check if memory usage is greater than or equal to threshold
if [[ $mem_usage -ge $threshold ]] 
then 
   # Clear page cache 
   sync; echo 1 > /proc/sys/vm/drop_caches 
   # Clear dentries and inodes 
   sync; echo 2 > /proc/sys/vm/drop_caches
   # Clear page cache, dentries, and inodes
   sync; echo 3 > /proc/sys/vm/drop_caches
   # Restart 
   swap swapoff -a && swapon -a 
else
   # Exit with status 1 if memory usage is below threshold 
   exit 1
fi

We have successfully executed the script to clear the cache and refresh the swap.

Thank You

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