How to Clear Cache Memory in Linux: Clear RAM Memory Cache, Buffer, and Swap Space
Have you ever encountered a process that’s consuming too much memory and wanted to clear it? Linux provides a way to flush or clear the RAM cache, which is essential for optimizing your system’s performance. In this guide, we’ll show you how to clear cache memory in Linux.
Methods to Clear Cache Memory in Linux
Every Linux System has three options to clear cache without interrupting any processes or services.
1. Clear PageCache only
sync; echo 1 > /proc/sys/vm/drop_caches
2. Clear dentries and inodes
sync; echo 2 > /proc/sys/vm/drop_caches
3. Clear PageCache, dentries, and inodes
sync; echo 3 > /proc/sys/vm/drop_caches
Understanding the Cache Clearing Commands
sync command flushes the file system buffer. Commands separated by “;” run sequentially. The shell waits for each command to terminate before executing the next command in the sequence. As mentioned in kernel documentation, writing to
drop_cache will clean the cache without killing any application or service. The
echo command is responsible for writing to the file.
How to Clear Swap Space in Linux?
If you want to clear Swap space, you may like to run the below command.
swapoff -a && swapon -a
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