How to Release Cache Memory In Linux

Linux OS has memory management system used to clear the buffer cache periodically but You can manually free up the memory cache with the following command:

There are three options available to flush cache memory. Use one of below as per your requirements.

Clear pagecache only use below command:

# sync; echo 1 > /proc/sys/vm/drop_caches

Clear dentries and inodes use below command

# sync; echo 2 > /proc/sys/vm/drop_caches

Clear pagecache, dentries ,buffer and inodes  use below command

# sync; echo 3 > /proc/sys/vm/drop_caches

Follow the below steps to clear cache Memory and verify

To Check the Memory status:

#free -m

Using Top command #top 

Run Below command to clear Cache Memory.

# sync; echo 3 > /proc/sys/vm/drop_caches

Now check and verify #free -m and #top command 

#free -m result

#top result