Ubuntu Clear Ram Cache



Memory
  • How to clear cache The majority of the most popular Linux distros use systemd these days, thus a systemctl command can be used to clear the memory cache. To clear PageCache only, use this command: $ sudo sysctl vm.dropcaches=1.
  • The article provides information on how to clear cache / buffer memory on a Linux server and set a cron job to clear cache memory at regular intervals using cron service. The steps also work on various Linux flavors like RHEL, CentOs, Fedora, Ubuntu.
  • Your cache will be freed up as soon as a process needs memory. It is designed to use all available memory. Under Linux it is completely OK to run with no 'free' memory (the one free refers to as 'free') as long as you have enough available (or total -buffers/cache is enough).

By default the Linux OS has a very efficient memory management process that should be freeing any cached memory on the machine that it is being run on. However when it comes to Cached memory the Linux OS may at times decide that the Cached memory is being used and is needed which can lead to memory related issues and ultimately take your server of any potentially free memory. To overcome this you can force the Linux OS to free up and stored Cached memory.
If you want to clear cached memory on ubuntu run the following command from your terminal

The page cache is automatically enabled on Linux systems and will transparently make IO faster by storing recently used data in the cache. If you want to manually clear the cache that can be done easily by sending an echo command to the /proc filesystem indicating to the kernel to drop the cache and free the memory used for the cache. If you want to manually clear the cache that can be done easily by sending an echo command to the /proc filesystem indicating to the kernel to drop the cache and free the memory used for the cache.

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

Clear Ram Cache Ubuntu 20.04

Clear linux cache

If you want to run this command every one hour you can use crontab to run this

Ubuntu Clear Ram Cache Mac

Thanks to john for this tip

Clear Dns Cache Ubuntu

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