How to Check Memory Usage and Clear Memory on CentOS

Before clearing the memory, let’s check the current memory usage.

Command: free -m

Then, use the command to clear the memory cache: echo 1 > /proc/sys/vm/drop_caches

After running the clear command, you can use the check command again: free -m, to see if a significant amount of memory has been freed.

 

ps aux results sorted by memory usage

ps -aux | sort -k4,4n

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