How to Clear Cache on Linux?

The Linux operating system effectively manages memory and outperforms other leading operating systems. One of its benefits is the ability to flush or free up RAM cache when a process consumes excessive memory. This article provides insight into how to clear the cache in Linux, including buffer and swap space. Read on for more details.

The Importance of Clearing Cache in Linux

Clearing the cache in Linux can occasionally be useful when a system is passing performance issues, similar to when a process consumes too important memory or when the cache uses too important fragment space. In similar cases, clearing the cache can help to free up memory and ameliorate system performance.

There’s generally no need to manually clear the cache regularly because the Linux kernel is generally designed to manage memory and cache effectively. constantly deleting the cache can hurt speed by forcing the system to read data from the slice rather than memory, decelerating operations down.

Clearing the cache is only sometimes necessary or advised because the Linux kernel is built to manage memory and cache efficiently. Nonetheless, emptying the cache occasionally may be beneficial.

Clear Ram Cache in Linux

Linux users can use the echo 1 > /proc/sys/vm/drop_caches command to clear the page cache and the sync command to flush the file system buffer cache to the disc to empty the RAM cache.

Below are the ways to clear Linux’s Memory cache:

Your Linux computer’s terminal software should be launched. Type sync and press Enter to flush the file system buffer cache to the disc. Use the command echo 1 > /proc/sys/vm/drop_caches to delete the page cache. Since files will then be read from the disc rather than memory, the system performance may be affected if the RAM cache is cleaned. Verifying that you have the necessary authorizations to complete these tasks is also essential.

The commands are run successively, the shell staying for each command to complete before moving on to the coming, and the train system buffer is gutted using the sync command. The drop cache command clears the cache without snooping with any formerly running programs or services, whereas the echo command writes to a train.

It is important to note that the first command is the safest option to utilize when erasing the disc cache in corporate and production environments. You should only use the echo 1 > command to clear the PageCache. However, the third option, echo 3 >, should only be used in production if it flushes out the page cache, entries, and inodes unless you fully understand its ramifications.

Clear Buffer and Cache in Linux

In this part, we’ll walk you through creating a shell script that uses a cron scheduler task to empty the RAM cache at midnight every day automatically.

Following are the steps to make a shell script that utilizes a cron scheduler task to release the RAM cache each day at midnight automatically:

On your Linux computer, launch a text editor like Nano or Vim.
Make a new file and name something meaningful, like “”
Enter the next command in the file:


Add the following command to empty the RAM cache next:

  • Echo 1 > /proc/sys/vm/drop_caches sync &&
  • To release the RAM cache, this program first uses the “sync” function to flush the file system buffer. Next, it uses the “echo” command to write “1” to the “drop caches” file in the virtual memory directory.
  • Save the document, then close the text editor.
  • Enter the following command in the terminal to make the file executable:
  •, chmod +x
  • Use the command to access the crontab configuration file:
  • To set the script to run every day at midnight, add the following line to the crontab file:
  • /path/to/ 0 0 * * *
  • Substitute “/path/to/” with the location of the saved file.
  • Exit the text editor after saving the crontab file.

I’m done now! Your shell script will now use the cron scheduler task to empty the RAM cache each day at midnight automatically.

How to Clear RAM Cache on Linux Production Server

It’s crucial to exercise caution while clearing the RAM cache on a production server because doing so may impact speed. To clean the RAM cache on a Linux production server, follow these steps:

  • Access the server by logging in with administrative rights.
  • By executing the following command, you can find out how much free memory the server has available:
  • free -m
  • Use the following command to determine the cache’s size:
  • Grep cat /proc/meminfo. This will display the cache’s current size in kilobytes (KB).
  • Grounded on the quantum of memory available and the size of the cache, determine whether drawing the cache is needed. It could be needed to clear the cache if it consumes a large quantum of available memory.

Run the following command as the root user to clear the cache:

/proc/sys/vm/drop_caches sync && echo 3
To release the RAM cache, this programme first utilizes the “sync” function to flush the file system buffer. Next, it uses the “echo” command to write the number “3” to the “drop_caches” file in the virtual memory directory.
Check the server’s performance to ensure that deleting the cache has no unfavorable consequences. Optimize the server’s setup to get the most out of its memory.

It’s crucial to remember that cleaning the RAM cache on a used server should only be done sparingly and when necessary. Before doing this, it is advised to seek advice from an experienced Linux administrator.

How to Clear Swap Space in Linux

To clear swap space in Linux, you can follow these steps:

  • Use the free -h command to see the current swap usage and availability.
  • This will display the swap utilization and availability right now in an understandable manner.
  • Use the following command to turn off the swap: sudo swapoff -a.
  • This will disable all swap devices.
  • To clear the swap, use the command sudo dd if=/dev/zero of=/swapfile bs=1M.
  • This will empty the contents of the swap file by writing zeros there. Repeat this process for each additional swap file or device you have.
  • Use the command sudo rm /swapfile to delete the swap file or partition.
  • You can delete your swap partition using a partitioning program like fdisk or parted.
  • With the relevant command, depending on your desired approach, recreate the swap file or partition. Use the command sudo fallocate -l 2G /swapfile, for instance, to create a new swap file with a size of 2GB.
  • Execute the following command: sudo mkswap /swapfile.
  • If you already have a swap partition, you can create a new partition using a partitioning tool and format it with the mkswap command.
  • Use the following command to enable the swap: sudo swapon -a.
  • All swap devices will then be enabled.
  • Run the free -h command to confirm the new swap space.
  • This ought to display the updated size of the new swap space.

It’s crucial to remember that any data kept in swap space will be lost if it is cleared. Consequently, it is advised to back up any crucial data before clearing the swap. Also, removing the swap may temporarily impair performance as the system adapts to the decreased memory available.


In conclusion, maintaining a Linux system’s performance and stability requires emptying the cache, buffers, and swap space. The swap area may get full of inactive pages and cause the system to slow down or crash, while the cache and buffer may hold extraneous data and slow down the system. Thankfully, emptying the cache, buffer, and swap space can all be done with simple commands or scripts. The swap space can also be disabled and enabled to clear the swap space. It’s vital to remember that emptying swap space should be done carefully because it could result in data loss or other problems. Emptying cache, buffer, and swap space frequently can keep a Linux system responsive and effective.


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Sidhak Verma

Myself Sidhak I am a student and a content writer and wans to share my ideas on social media and finding ways of earning money online on the internet

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