To make this parameter persistent across reboots, append the following line to the /etc/sysctl. While the swappiness value of 60 is OK for most Linux systems, for production servers, you may need to set a lower value.įor example, to set the swappiness value to 10, run: sudo sysctl vm.swappiness=10 You can check the current swappiness value by typing the following command: cat /proc/sys/vm/swappiness 60 A low value will make the kernel to try to avoid swapping whenever possible, while a higher value will make the kernel to use the swap space more aggressively. Swappiness can have a value between 0 and 100. Swappiness is a Linux kernel property that defines how often the system will use the swap space. swapfile file 1024M 507.4M -1 sudo free -h total used free shared buff/cache available 1.9. , as shown below: sudo swapon -show NAME TYPE SIZE USED PRIO For comparison the same setup with Hydrogen instead of FerriteCore uses 1,335 MB. It reduces the RAM usage (heap size) from 1,792 MB to 984 MB. You can easily run a 24 person server on less than 500MB of ram The effects are absolutely amazing. The amount of memory saved will depend on the pack. Verify that the swap is active by using either the swapon or the free command FerriteCore Mod (1.19.4, 1.18.2) reduces the memory usage of Minecraft in a few different ways. LaggRemover eliminates this problem by keeping the bare minimum of chunks required loaded. The more chunks loaded, the more lag your server will have. To make the change permanent open the /etc/fstab file: sudo nano /etc/fstab Ram Usage Reduction - LaggRemover decreases the amount of ram your server uses by monitoring and controlling the amount of chunks loaded into memory. Use the mkswap utility to set up a Linux swap area on the file: sudo mkswap /swapfileĪctivate the swap file using the following command: sudo swapon /swapfile Only the root user should be able to write and read the swap file. If fallocate is not installed or you get an error message saying fallocate failed: Operation not supported then use the following command to create the swap file: sudo dd if=/dev/zero of=/swapfile bs=1024 count=1048576 Start by creating a file which will be used for swap: sudo fallocate -l 1G /swapfile Perform the steps below to add swap space on Ubuntu 18.04. If you want to add more swap, replace 1G with the size of the swap space you need. The user you are logged in as must have sudo privileges NAME TYPE SIZE USED PRIOĪlthough possible, it is not common to have multiple swap spaces on a single machine. Otherwise, if you get something like below, you already have swap enabled on your machine. If the output is empty, it means that your system does not have swap space enabled.

Before You Begin #īefore continuing with this tutorial, check if your Ubuntu installation already has swap enabled by typing: sudo swapon -show This tutorial covers the steps necessary to add a swap file on Ubuntu 18.04 systems. Generally when running Ubuntu on a virtual machine, a swap partition is not present, and the only option is to create a swap file. Swap space can take the form of either a dedicated swap partition or a swap file. What Is Linux Swap? And Why Should You Use It?

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