{"id":16367,"date":"2024-10-31T19:36:01","date_gmt":"2024-10-31T19:36:01","guid":{"rendered":"https:\/\/truehost.com\/support\/?post_type=docs&#038;p=16367"},"modified":"2024-11-02T07:41:48","modified_gmt":"2024-11-02T07:41:48","password":"","slug":"how-to-optimize-linux-server-swap-usage","status":"publish","type":"docs","link":"https:\/\/truehost.com\/support\/knowledge-base\/how-to-optimize-linux-server-swap-usage\/","title":{"rendered":"How to Optimize Linux Server Swap Usage"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">How to Optimize Linux Server Swap Usage<\/h2>\n\n\n\n<p>Swap space on Linux servers provides a buffer when physical RAM is fully utilized, allowing the system to use disk space as &#8220;virtual memory.&#8221; However, excessive swap usage can degrade performance, as disk access is significantly slower than accessing RAM. Optimizing swap usage helps improve overall server responsiveness and stability.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">1. Check Current Swap Usage<\/h3>\n\n\n\n<p>To monitor swap usage and determine whether adjustments are necessary, use:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>free -h<\/code><\/pre>\n\n\n\n<p>This command shows the total, used, and available memory and swap space. If swap usage is high while free RAM is available, you may need to adjust swap settings.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">2. Adjust the <code>swappiness<\/code> Value<\/h3>\n\n\n\n<p>The <code>swappiness<\/code> parameter controls how often Linux uses swap. It ranges from 0 to 100:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Low <code>swappiness<\/code> (0-10)<\/strong>: Prioritizes RAM usage and avoids swap. Suitable for high-performance servers where minimizing disk I\/O is critical.<\/li>\n\n\n\n<li><strong>Default <code>swappiness<\/code> (60)<\/strong>: Suitable for a balanced use of RAM and swap.<\/li>\n\n\n\n<li><strong>High <code>swappiness<\/code> (above 60)<\/strong>: Aggressively uses swap. Useful for systems with limited RAM.<\/li>\n<\/ul>\n\n\n\n<p>To check the current <code>swappiness<\/code> value:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat \/proc\/sys\/vm\/swappiness<\/code><\/pre>\n\n\n\n<p>To temporarily set a new value (e.g., <code>10<\/code>):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo sysctl vm.swappiness=10<\/code><\/pre>\n\n\n\n<p>To make it persistent across reboots, add the following line to <code>\/etc\/sysctl.conf<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vm.swappiness=10<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">3. Monitor and Limit Swapiness with <code>sysctl<\/code><\/h3>\n\n\n\n<p>To dynamically adjust <code>swappiness<\/code> based on server conditions, consider using a script that checks memory usage and adjusts <code>swappiness<\/code> as needed. This can help optimize swap usage based on current load.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">4. Use ZRAM for Compressed Swap in RAM<\/h3>\n\n\n\n<p>ZRAM creates a compressed block device in RAM, reducing the need for disk-based swap and improving performance. It is particularly beneficial on systems with limited physical RAM.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">To set up ZRAM:<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Install <code>zram-tools<\/code>:<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt install zram-tools<\/code><\/pre>\n\n\n\n<p>This approach compresses swap data in memory, providing faster swap performance compared to traditional disk-based swap.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">5. Optimize Swap File Size<\/h3>\n\n\n\n<p>If your server often uses swap, increasing swap size might improve performance. To resize or create a swap file:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Disable the current swap file:<\/strong><\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo swapoff -v \/swapfile<\/code><\/pre>\n\n\n\n<p>   2. Resize or recreate the swap file (for example, 4GB):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo dd if=\/dev\/zero of=\/swapfile bs=1G count=4<\/code><\/pre>\n\n\n\n<p>3. Set proper permissions:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo chmod 600 \/swapfile<\/code><\/pre>\n\n\n\n<p>4. Format the swap file:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo mkswap \/swapfile<\/code><\/pre>\n\n\n\n<p>5. <strong>Enable the new swap file:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo swapon \/swapfile<\/code><\/pre>\n\n\n\n<p>6. Make it persistent by adding to <code>\/etc\/fstab<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/swapfile swap swap defaults 0 0<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">6. Monitor Swap with <code>vmstat<\/code> and <code>top<\/code><\/h3>\n\n\n\n<p>Tools like <code>vmstat<\/code> and <code>top<\/code> allow you to observe swap activity and evaluate swap performance:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>vmstat<\/code><\/strong>: View system performance, including swap in\/out activity<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>vmstat 5<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>top<\/code><\/strong>: Observe swap usage per process and sort by memory usage.<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-code\"><code>top<\/code><\/pre>\n\n\n\n<p>Monitoring helps identify high-memory processes causing excessive swap usage.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\">7. Use Swap Partition Instead of Swap File (Optional)<\/h3>\n\n\n\n<p>For servers under heavy load, using a dedicated swap partition may offer better performance compared to a swap file. To create a swap partition:<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Use a partitioning tool like <code>fdisk<\/code> or <code>parted<\/code> to create a new partition.<\/li>\n\n\n\n<li>Format it as swap:<\/li>\n<\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo mkswap \/dev\/sdX2<\/code><\/pre>\n\n\n\n<p>   3. Enable the partition:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo swapon \/dev\/sdX2<\/code><\/pre>\n\n\n\n<p>  4. Add to <code>\/etc\/fstab<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>\/dev\/sdX2 swap swap defaults 0 0<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">8. Tune Cache Pressure (<code>vm.vfs_cache_pressure<\/code>)<\/h3>\n\n\n\n<p>The <code>vfs_cache_pressure<\/code> setting controls the tendency of the kernel to reclaim memory used for caching directory and inode objects. Lowering it allows the system to retain more cached data.<\/p>\n\n\n\n<p>To check the current value:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>cat \/proc\/sys\/vm\/vfs_cache_pressure<\/code><\/pre>\n\n\n\n<p>To temporarily set it (e.g., to <code>50<\/code>):<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo sysctl vm.vfs_cache_pressure=50<\/code><\/pre>\n\n\n\n<p>To make this change permanent, add to <code>\/etc\/sysctl.conf<\/code>:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>vm.vfs_cache_pressure=50<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">9. Disable or Limit Swap for Specific Processes<\/h3>\n\n\n\n<p>Using <strong>cgroups<\/strong> (control groups), you can restrict swap usage for particular processes. This is useful if certain processes should avoid swap for performance reasons.<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Install <code>cgroup-tools<\/code>:<\/strong><\/li>\n<\/ol>\n\n\n\n<p id=\"block-6e75b294-1abd-4a8e-bbf3-3e9ad01d1f44\">To temporarily set it (e.g., to <code>50<\/code>):<\/p>\n\n\n\n<pre id=\"block-ae318e47-1f1d-4dc4-beda-7b581eb2c1b9\" class=\"wp-block-code\"><code>sudo sysctl vm.vfs_cache_pressure=50<\/code><\/pre>\n\n\n\n<p id=\"block-e8d3adf3-4c99-423f-adb0-6c771023ee4f\">To make this change permanent, add to <code>\/etc\/sysctl.conf<\/code>:<\/p>\n\n\n\n<pre id=\"block-76f7927d-3f38-4c5c-8675-9511bf973439\" class=\"wp-block-code\"><code>vm.vfs_cache_pressure=50<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"block-5c506a36-33f3-4fcf-878b-3b5e2a57992b\">9. Disable or Limit Swap for Specific Processes<\/h3>\n\n\n\n<p id=\"block-652f9cea-a3f5-45db-88be-ac23804d87dc\">Using <strong>cgroups<\/strong> (control groups), you can restrict swap usage for particular processes. This is useful if certain processes should avoid swap for performance reasons.<\/p>\n\n\n\n<ol class=\"wp-block-list\" id=\"block-c94d6f1a-450d-4739-87eb-67e3c4296ac9\">\n<li><strong>Install <code>cgroup-tools<\/code>:<\/strong><\/li>\n<\/ol>\n\n\n\n<pre id=\"block-2ba9467b-9f32-4373-bc3a-5ca2a883abdb\" class=\"wp-block-code\"><code>sudo apt install cgroup-tools<\/code><\/pre>\n\n\n\n<p id=\"block-271a4ca0-50e5-4c64-871f-967c9dfbfe57\"><strong><\/strong> <strong>2. Create a control group with limited memory:<\/strong><\/p>\n\n\n\n<pre id=\"block-6312322d-3c7e-41c6-bbdf-0b26f68bd895\" class=\"wp-block-code\"><code>sudo cgcreate -g memory:\/no-swap-group<br><br>sudo cgset -r memory.swappiness=0 no-swap-group<\/code><\/pre>\n\n\n\n<p id=\"block-49fd8bc6-2380-48bb-b51f-6182d0f825a1\">3. <strong>Assign a proce<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo apt install cgroup-tools<\/code><\/pre>\n\n\n\n<p><strong> <\/strong>  <strong>2. Create a control group with limited memory:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo cgcreate -g memory:\/no-swap-group\n\nsudo cgset -r memory.swappiness=0 no-swap-group<\/code><\/pre>\n\n\n\n<p>3. <strong>Assign a process<\/strong> to this group:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>sudo cgexec -g memory:no-swap-group your_command<\/code><\/pre>\n\n\n\n<h3 class=\"wp-block-heading\">Author&#8217;s final word<\/h3>\n\n\n\n<p>Optimizing swap usage on a Linux server involves balancing between memory, disk space, and system responsiveness. By carefully tuning parameters like <code>swappiness<\/code>, using tools like ZRAM, resizing swap space, and monitoring server performance, you can significantly improve your server\u2019s responsiveness and make better use of available resources.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>How to Optimize Linux Server Swap Usage Swap space on Linux servers provides a buffer when physical RAM is fully utilized, allowing the system to use disk space as &#8220;virtual memory.&#8221; However, excessive swap usage can degrade performance, as disk access is significantly slower than accessing RAM. Optimizing swap usage helps improve overall server responsiveness [&hellip;]<\/p>\n","protected":false},"author":9,"featured_media":0,"comment_status":"open","ping_status":"closed","template":"","meta":{"_eb_attr":"","_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"doc_category":[1820,1824,1879,2128],"doc_tag":[],"class_list":["post-16367","docs","type-docs","status-publish","hentry","doc_category-cloud-servers-in-kenya","doc_category-dedicated-servers","doc_category-servers","doc_category-vps-servers"],"year_month":"2026-06","word_count":784,"total_views":0,"reactions":{"happy":0,"normal":0,"sad":0},"author_info":{"name":"Eugene","author_nicename":"eugene","author_url":"https:\/\/truehost.com\/support\/author\/eugene\/"},"doc_category_info":[{"term_name":"Cloud servers in Kenya","term_url":"https:\/\/truehost.com\/support\/docs-category\/cloud-servers-in-kenya\/"},{"term_name":"dedicated servers","term_url":"https:\/\/truehost.com\/support\/docs-category\/dedicated-servers\/"},{"term_name":"Servers","term_url":"https:\/\/truehost.com\/support\/docs-category\/servers\/"},{"term_name":"VPS-Servers","term_url":"https:\/\/truehost.com\/support\/docs-category\/vps-servers\/"}],"doc_tag_info":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.8 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to Optimize Linux Server Swap Usage -<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/truehost.com\/support\/knowledge-base\/how-to-optimize-linux-server-swap-usage\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Optimize Linux Server Swap Usage -\" \/>\n<meta property=\"og:description\" content=\"How to Optimize Linux Server Swap Usage Swap space on Linux servers provides a buffer when physical RAM is fully utilized, allowing the system to use disk space as &#8220;virtual memory.&#8221; However, excessive swap usage can degrade performance, as disk access is significantly slower than accessing RAM. 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