{"id":2957,"date":"2026-02-04T01:14:57","date_gmt":"2026-02-04T04:14:57","guid":{"rendered":"https:\/\/helpsysadmin.com.br\/blog\/?p=2957"},"modified":"2026-02-04T01:17:02","modified_gmt":"2026-02-04T04:17:02","slug":"swappiness-linux-exemplos-reais","status":"publish","type":"post","link":"https:\/\/helpsysadmin.com.br\/blog\/swappiness-linux-exemplos-reais\/","title":{"rendered":"Swappiness no Linux: o que \u00e9, como funciona e exemplos reais em produ\u00e7\u00e3o"},"content":{"rendered":"<div id=\"helps-3031275141\" class=\"helps-before-content-2 helps-entity-placement\"><script async src=\"https:\/\/pagead2.googlesyndication.com\/pagead\/js\/adsbygoogle.js?client=ca-pub-3661896953164277\"\r\n     crossorigin=\"anonymous\"><\/script>\r\n<!-- 2anuncios display quadrado -->\r\n<ins class=\"adsbygoogle\"\r\n     style=\"display:block\"\r\n     data-ad-client=\"ca-pub-3661896953164277\"\r\n     data-ad-slot=\"5051229894\"\r\n     data-ad-format=\"auto\"\r\n     data-full-width-responsive=\"true\"><\/ins>\r\n<script>\r\n     (adsbygoogle = window.adsbygoogle || []).push({});\r\n<\/script><\/div>\n<p>Beleza, vamos desmistificar <strong>swappiness <a href=\"https:\/\/helpsysadmin.com.br\/blog\/como-instalar-crowdsec\/\" data-internallinksmanager029f6b8e52c=\"1\" title=\"Como instalar Crowdsec\" target=\"_blank\" rel=\"noopener\">linux<\/a><\/strong> sem teoria vaga e com <strong>exemplos reais de produ\u00e7\u00e3o<\/strong> \u2014 do tipo que voc\u00ea v\u00ea em VPS, Dedicado, WordPress e banco de dados. \ud83e\udde0\ud83d\udcbe<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-o-que-e-swappiness-sem-enrolacao\">O que \u00e9 swappiness (sem enrola\u00e7\u00e3o)<\/h2>\n\n\n\n<p><strong>Swappiness<\/strong> define <strong>o qu\u00e3o agressivamente o kernel Linux prefere usar swap em vez de RAM<\/strong>.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Valor vai de <strong>0 a 100<\/strong><\/li>\n\n\n\n<li>Controla <strong>prioridade<\/strong>, n\u00e3o uma regra fixa<\/li>\n\n\n\n<li>N\u00e3o significa \u201cs\u00f3 usar swap quando acabar a RAM\u201d<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udc49 Em resumo:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Quanto maior o swappiness, mais cedo o Linux joga p\u00e1ginas de mem\u00f3ria para o swap.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-valores-tipicos-e-o-comportamento-real\">Valores t\u00edpicos e o comportamento real<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-swappiness-60-padrao-da-maioria-das-distros\">\ud83d\udd34 Swappiness = 60 (padr\u00e3o da maioria das distros)<\/h3>\n\n\n\n<p><strong>O que acontece na pr\u00e1tica:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Swap come\u00e7a a ser usada <strong>mesmo com RAM livre<\/strong><\/li>\n\n\n\n<li>Kernel tenta manter cache de disco grande<\/li>\n\n\n\n<li>Bom para desktops, <strong>ruim para servidores<\/strong><\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udcc9 Sintoma comum:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>RAM ainda dispon\u00edvel<\/li>\n\n\n\n<li>Swap em uso<\/li>\n\n\n\n<li>Sistema \u201clento do nada\u201d<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-swappiness-10-servidor-web-classico\">\ud83d\udfe1 Swappiness = 10 (servidor web cl\u00e1ssico)<\/h3>\n\n\n\n<p><strong>Comportamento real:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Prioriza RAM<\/li>\n\n\n\n<li>S\u00f3 usa swap quando h\u00e1 press\u00e3o real de mem\u00f3ria<\/li>\n\n\n\n<li>Mant\u00e9m cache suficiente sem exagero<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udccc Ideal para:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>WordPress<\/li>\n\n\n\n<li>Apache + Nginx<\/li>\n\n\n\n<li>PHP-FPM<\/li>\n\n\n\n<li>VPS compartilhada<\/li>\n\n\n\n<li>Servidor Dedicado<\/li>\n<\/ul>\n\n\n\n<p>\ud83e\udde0 Exemplo real:<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>VPS com 8 GB RAM<br>Antes: swap usada com 3\u20134 GB livres<br>Depois: swap s\u00f3 entra acima de 90% de uso de RAM<\/p>\n<\/blockquote>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-swappiness-1-banco-de-dados-baixa-latencia\">\ud83d\udfe2 Swappiness = 1 (banco de dados \/ baixa lat\u00eancia)<\/h3>\n\n\n\n<p><strong>Comportamento:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Swap \u00e9 \u00faltimo recurso<\/li>\n\n\n\n<li>Menor chance de lat\u00eancia imprevis\u00edvel<\/li>\n\n\n\n<li>Mais risco de OOM se faltar RAM<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udccc Usado em:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>MariaDB \/ MySQL<\/li>\n\n\n\n<li>PostgreSQL<\/li>\n\n\n\n<li>Redis<\/li>\n\n\n\n<li>Elasticsearch<\/li>\n<\/ul>\n\n\n\n<p>\u26a0\ufe0f Aten\u00e7\u00e3o:<br>Se o processo estourar a RAM \u2192 <strong>OOM Killer<\/strong> entra em a\u00e7\u00e3o.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-swappiness-0-caso-especial\">\u26ab Swappiness = 0 (caso especial)<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Swap <strong>n\u00e3o \u00e9 usada proativamente<\/strong><\/li>\n\n\n\n<li>S\u00f3 entra quando <strong>n\u00e3o h\u00e1 alternativa<\/strong><\/li>\n\n\n\n<li>Pode ser ignorado em kernels antigos<\/li>\n\n\n\n<li>N\u00e3o resolve falta de RAM<\/li>\n<\/ul>\n\n\n\n<p>\ud83d\udc49 N\u00e3o \u00e9 m\u00e1gico e raramente recomendado hoje.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-exemplo-real-wordpress-lento-com-ram-sobrando\">Exemplo real: WordPress lento com RAM sobrando<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-situacao\">Situa\u00e7\u00e3o<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li>VPS: 12 GB RAM<\/li>\n\n\n\n<li>Swap: 4 GB<\/li>\n\n\n\n<li>Swappiness: 60 (default)<\/li>\n\n\n\n<li>MariaDB + PHP-FPM<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-sintomas\">Sintomas<\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>free -h<\/code> mostra RAM livre<\/li>\n\n\n\n<li><code>vmstat<\/code> mostra swap ativa<\/li>\n\n\n\n<li>Requests com lat\u00eancia alta<\/li>\n\n\n\n<li>Load normal, mas site \u201cpesado\u201d<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-causa-real\">Causa real<\/h3>\n\n\n\n<p>O kernel est\u00e1:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Jogando p\u00e1ginas do PHP-FPM para swap<\/li>\n\n\n\n<li>Mantendo cache de disco exagerado<\/li>\n\n\n\n<li>Criando lat\u00eancia em cada page load<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-solucao-aplicada\">Solu\u00e7\u00e3o aplicada<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>sysctl vm.swappiness=10\n<\/pre><\/div>\n\n\n\n<p>Resultado:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Swap praticamente zerada<\/li>\n\n\n\n<li>Lat\u00eancia caiu<\/li>\n\n\n\n<li>CPU ficou mais est\u00e1vel<\/li>\n\n\n\n<li>Nenhuma outra mudan\u00e7a feita<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-swappiness-nao-resolve\">Swappiness N\u00c3O resolve<\/h2>\n\n\n\n<p>\u274c Falta real de RAM<br>\u274c Memory leak<br>\u274c PHP-FPM mal dimensionado<br>\u274c MariaDB com buffer pool maior que a RAM<br>\u274c Overselling do provedor<\/p>\n\n\n\n<p>Swappiness <strong>s\u00f3 muda prioridade<\/strong>, n\u00e3o cria mem\u00f3ria.<\/p>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-como-verificar-e-alterar\">Como verificar e alterar<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-ver-valor-atual\">Ver valor atual<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>cat \/proc\/sys\/vm\/swappiness\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-alterar-temporariamente\">Alterar temporariamente<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>sysctl vm.swappiness=10\n<\/pre><\/div>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-alterar-permanentemente\">Alterar permanentemente<\/h3>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre>echo &quot;vm.swappiness=10&quot; &gt;&gt; \/etc\/sysctl.conf\nsysctl -p\n<\/pre><\/div>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-valores-recomendados-vida-real\">Valores recomendados (vida real)<\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Cen\u00e1rio<\/th><th>Swappiness<\/th><\/tr><\/thead><tbody><tr><td>Desktop<\/td><td>60<\/td><\/tr><tr><td>VPS WordPress<\/td><td>10<\/td><\/tr><tr><td>Servidor web geral<\/td><td>5\u201310<\/td><\/tr><tr><td>Banco de dados<\/td><td>1<\/td><\/tr><tr><td>Redis \/ cache<\/td><td>1<\/td><\/tr><tr><td>Sistema com ZRAM<\/td><td>5\u201320<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-regra-de-ouro\">Regra de ouro<\/h2>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Swap deve ser airbag, n\u00e3o motor principal.<\/strong><\/p>\n<\/blockquote>\n\n\n\n<p>Se swap est\u00e1 ativa com RAM livre \u2192 swappiness provavelmente est\u00e1 alto demais <strong>ou<\/strong> voc\u00ea tem outro gargalo escondido.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-faq\">FAQ<\/h2>\n\n\n\n<div class=\"schema-faq wp-block-yoast-faq-block\"><div class=\"schema-faq-section\" id=\"faq-question-1770177880971\"><strong class=\"schema-faq-question\">O que \u00e9 swappiness no Linux?<\/strong> <p class=\"schema-faq-answer\">Swappiness \u00e9 um par\u00e2metro do kernel Linux que define o quanto o sistema prioriza o uso de swap em rela\u00e7\u00e3o \u00e0 mem\u00f3ria RAM, influenciando diretamente a performance.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1770177895013\"><strong class=\"schema-faq-question\">Qual o melhor valor de swappiness para servidores?<\/strong> <p class=\"schema-faq-answer\">Para servidores, valores entre <strong>5 e 10<\/strong> s\u00e3o os mais indicados. Bancos de dados e sistemas de baixa lat\u00eancia costumam usar <strong>1<\/strong>.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1770177916229\"><strong class=\"schema-faq-question\">Swappiness alto deixa o servidor lento?<\/strong> <p class=\"schema-faq-answer\">Sim. Swappiness alto pode fazer o Linux usar swap mesmo com RAM livre, causando lat\u00eancia e sensa\u00e7\u00e3o de lentid\u00e3o em aplica\u00e7\u00f5es.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1770177947219\"><strong class=\"schema-faq-question\">Swappiness resolve falta de mem\u00f3ria RAM?<\/strong> <p class=\"schema-faq-answer\">N\u00e3o. Swappiness apenas ajusta a prioridade entre RAM e swap. Se faltar RAM, o problema \u00e9 dimensionamento ou configura\u00e7\u00e3o da aplica\u00e7\u00e3o.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1770177959692\"><strong class=\"schema-faq-question\">Qual swappiness usar em WordPress?<\/strong> <p class=\"schema-faq-answer\">Em servidores WordPress com PHP-FPM e banco de dados local, o valor recomendado \u00e9 <strong>10<\/strong>, garantindo equil\u00edbrio entre cache e baixa lat\u00eancia.<\/p> <\/div> <div class=\"schema-faq-section\" id=\"faq-question-1770177983469\"><strong class=\"schema-faq-question\">Swappiness 0 \u00e9 recomendado?<\/strong> <p class=\"schema-faq-answer\">N\u00e3o na maioria dos casos. Swappiness 0 pode aumentar o risco de OOM Killer e n\u00e3o impede totalmente o uso de swap.<\/p> <\/div> <\/div>\n","protected":false},"excerpt":{"rendered":"<p>Beleza, vamos desmistificar swappiness linux sem teoria vaga e com exemplos reais de produ\u00e7\u00e3o \u2014 do tipo que voc\u00ea v\u00ea em VPS, [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":2958,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9,1279],"tags":[2416,2822,2826,2830,2548,2824,2820,2828],"class_list":["post-2957","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-gerenciamento-servidor","category-linux","tag-administracao-de-sistemas","tag-linux-performance-3","tag-otimizacao-linux","tag-performance-vps","tag-servidores-linux","tag-swap-linux-2","tag-swappiness","tag-tuning-kernel"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.5 (Yoast SEO v27.5) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Swappiness no Linux: o que \u00e9, como funciona e exemplos reais em produ\u00e7\u00e3o<\/title>\n<meta name=\"description\" content=\"Entenda o swappiness no Linux com exemplos reais em servidores, VPS e WordPress. 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Bancos de dados e sistemas de baixa lat\u00eancia costumam usar <strong>1<\/strong>.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/helpsysadmin.com.br\/blog\/swappiness-linux-exemplos-reais\/#faq-question-1770177916229","position":3,"url":"https:\/\/helpsysadmin.com.br\/blog\/swappiness-linux-exemplos-reais\/#faq-question-1770177916229","name":"Swappiness alto deixa o servidor lento?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"Sim. Swappiness alto pode fazer o Linux usar swap mesmo com RAM livre, causando lat\u00eancia e sensa\u00e7\u00e3o de lentid\u00e3o em aplica\u00e7\u00f5es.","inLanguage":"pt-BR"},"inLanguage":"pt-BR"},{"@type":"Question","@id":"https:\/\/helpsysadmin.com.br\/blog\/swappiness-linux-exemplos-reais\/#faq-question-1770177947219","position":4,"url":"https:\/\/helpsysadmin.com.br\/blog\/swappiness-linux-exemplos-reais\/#faq-question-1770177947219","name":"Swappiness resolve falta de mem\u00f3ria RAM?","answerCount":1,"acceptedAnswer":{"@type":"Answer","text":"N\u00e3o. Swappiness apenas ajusta a prioridade entre RAM e swap. 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