{"id":83511,"date":"2020-06-01T07:42:29","date_gmt":"2020-06-01T05:42:29","guid":{"rendered":"https:\/\/prohoster.info\/blog\/administrirovanie\/proizvoditelnost-raspberry-pi-dobavlyaem-zram-i-izmenyaem-parametry-yadra"},"modified":"2020-06-01T07:42:29","modified_gmt":"2020-06-01T05:42:29","slug":"proizvoditelnost-raspberry-pi-dobavlyaem-zram-i-izmenyaem-parametry-yadra","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pt\/blog\/administrirovanie\/proizvoditelnost-raspberry-pi-dobavlyaem-zram-i-izmenyaem-parametry-yadra","title":{"rendered":"Desempenho do Raspberry Pi: adicionando ZRAM e alterando os par\u00e2metros do kernel","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>H\u00e1 algumas semanas, publiquei <noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/pinebook-pro-my-first-impressions-and-setup-tips\/\">uma an\u00e1lise do Pinebook Pro<\/a><\/noindex>. Como o Raspberry Pi 4 tamb\u00e9m \u00e9 baseado em ARM, algumas das otimiza\u00e7\u00f5es mencionadas no artigo anterior s\u00e3o bem adequadas. Gostaria de compartilhar esses truques e ver se voc\u00ea tamb\u00e9m percebe melhorias de desempenho.<\/p>\n<p>Ap\u00f3s instalar o Raspberry Pi em meu <noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/home-lab-beginners-guide-hardware\/\">servidor dom\u00e9stico<\/a><\/noindex> , percebi que em momentos de falta de mem\u00f3ria RAM, ele se tornava muito pouco responsivo e at\u00e9 travava. Para resolver esse problema, adicionei ZRAM e fiz algumas altera\u00e7\u00f5es nos par\u00e2metros do kernel.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h1>Ativando o ZRAM no Raspberry Pi<\/h1>\n<p>\n<img decoding=\"async\" alt=\"Desempenho do Raspberry Pi: adicionando ZRAM e alterando os par\u00e2metros do kernel\" src=\"\/wp-content\/uploads\/2020\/06\/d5e0d7c2e50dd17a97f008c7ee6dfe30.jpg\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/www.kernel.org\/doc\/Documentation\/blockdev\/zram.txt\">ZRAM<\/a><\/noindex> cria um armazenamento em bloco na mem\u00f3ria RAM chamado \/dev\/zram0 (ou 1, 2, 3, etc.). As p\u00e1ginas gravadas l\u00e1 s\u00e3o comprimidas e mantidas na mem\u00f3ria. Isso permite uma entrada e sa\u00edda de dados muito r\u00e1pidas, al\u00e9m de liberar mem\u00f3ria atrav\u00e9s da compress\u00e3o.<\/p>\n<p>O Raspberry Pi 4 vem com 1, 2, 4 ou 8 GB de mem\u00f3ria RAM. Vou usar o modelo de 1 GB, ent\u00e3o ajuste a instru\u00e7\u00e3o de acordo com o seu modelo. Com 1 GB, o arquivo de troca padr\u00e3o (lento!) ser\u00e1 usado com menos frequ\u00eancia. Eu usei este script <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/foundObjects\/zram-swap\">zram-swap<\/a><\/noindex> para instala\u00e7\u00e3o e configura\u00e7\u00e3o autom\u00e1tica.<\/p>\n<p>As instru\u00e7\u00f5es est\u00e3o no reposit\u00f3rio no link acima. Instala\u00e7\u00e3o:<\/p>\n<pre><code class=\"bash\">git clone https:\/\/github.com\/foundObjects\/zram-swap.git\ncd zram-swap &amp;&amp; sudo .\/install.sh<\/code><\/pre>\n<p>\nSe voc\u00ea deseja editar a configura\u00e7\u00e3o:<\/p>\n<pre><code class=\"bash\">vi \/etc\/default\/zram-swap<\/code><\/pre>\n<p>\nAl\u00e9m disso, voc\u00ea pode ativar o ZRAM instalando <code>zram-tools<\/code>. <b>Se voc\u00ea usar esse m\u00e9todo, certifique-se de editar a configura\u00e7\u00e3o<\/b> no arquivo <code>\/etc\/default\/zramswap<\/code>, e instale cerca de 1 GB de ZRAM:<\/p>\n<pre><code class=\"bash\">sudo apt install zram-tools<\/code><\/pre>\n<p>\nAp\u00f3s a instala\u00e7\u00e3o, voc\u00ea pode visualizar as estat\u00edsticas do armazenamento ZRAM com o seguinte comando:<\/p>\n<pre><code class=\"bash\">sudo cat \/proc\/swaps\nFilename\t\t\t\tType\t\tSize\tUsed\tPriority\n\/var\/swap                               file\t\t102396\t0\t-2\n\/dev\/zram0                              partition\t1185368\t265472\t5\npi@raspberrypi:~ $<\/code><\/pre>\n<p><\/p>\n<h1>Adicionando par\u00e2metros do kernel para melhor uso do ZRAM<\/h1>\n<p>\nAgora vamos corrigir o comportamento do sistema quando o Raspberry Pi recorre \u00e0 troca no \u00faltimo momento, o que frequentemente resulta em travamentos. Vamos adicionar algumas linhas no arquivo <b>\/etc\/sysctl.conf<\/b> e reiniciar.<\/p>\n<p>Essas linhas 1) <b>adiar\u00e3o o inevit\u00e1vel esgotamento da mem\u00f3ria<\/b>, aumentando a press\u00e3o sobre o cache do kernel e 2) <b>come\u00e7ar\u00e3o mais cedo a se preparar para o esgotamento da mem\u00f3ria<\/b>, iniciando a troca com anteced\u00eancia. Mas ser\u00e1 uma troca de mem\u00f3ria comprimida muito mais eficiente atrav\u00e9s do ZRAM!<\/p>\n<p>Estas s\u00e3o as linhas que precisam ser adicionadas ao final do arquivo <b>\/etc\/sysctl.conf<\/b>:<\/p>\n<pre><code class=\"plaintext\">vm.vfs_cache_pressure=500\nvm.swappiness=100\nvm.dirty_background_ratio=1\nvm.dirty_ratio=50<\/code><\/pre>\n<p>\nEm seguida, reinicie o sistema ou ative as edi\u00e7\u00f5es com o seguinte comando:<\/p>\n<pre><code class=\"bash\">sudo sysctl --system<\/code><\/pre>\n<p>\n<b>vm.vfs_cache_pressure=500<\/b> aumenta a press\u00e3o sobre o cache, o que aumenta a tend\u00eancia do kernel de reciclar a mem\u00f3ria usada para o cache de objetos de diret\u00f3rio e \u00edndices. Voc\u00ea usar\u00e1 menos mem\u00f3ria por um per\u00edodo mais longo. A queda abrupta de desempenho \u00e9 compensada por meio de uma troca mais antecipada.<\/p>\n<p><b>vm.swappiness=100<\/b> aumenta o par\u00e2metro de qu\u00e3o agressivamente o kernel far\u00e1 a troca de p\u00e1ginas de mem\u00f3ria, j\u00e1 que estamos usando primeiro o ZRAM.<\/p>\n<p><b>vm.dirty_background_ratio=1 &amp; vm.dirty_ratio=50<\/b> \u2014 processos em segundo plano come\u00e7ar\u00e3o a escrever assim que atingirem o limite de 1%, mas o sistema n\u00e3o executar\u00e1 forcadamente a E\/S s\u00edncrona at\u00e9 atingir o dirty_ratio de 50%.<\/p>\n<p>Essas quatro linhas (quando usadas com ZRAM) ajudar\u00e3o a melhorar o desempenho caso voc\u00ea <u>inevitavelmente<\/u> fique sem mem\u00f3ria RAM e comece a trocar, como aconteceu comigo. Sabendo desse fato, e considerando a compress\u00e3o de mem\u00f3ria do ZRAM que \u00e9 tr\u00eas vezes melhor, \u00e9 melhor iniciar essa troca mais cedo.<\/p>\n<p>A press\u00e3o sobre o cache \u00e9 \u00fatil porque basicamente estamos dizendo ao kernel: \"Ei, escute, eu n\u00e3o tenho mem\u00f3ria extra para usar como cache, ent\u00e3o, por favor, libere-a o mais r\u00e1pido poss\u00edvel e mantenha apenas os dados mais frequentemente usados\/importantes.\"<\/p>\n<p>Mesmo com a redu\u00e7\u00e3o do cache, se com o tempo a maior parte da mem\u00f3ria instalada estiver ocupada, o kernel iniciar\u00e1 a troca opportunisticamente muito mais cedo, de modo que o processador (compress\u00e3o) e a E\/S de troca n\u00e3o sejam acionados at\u00e9 o \u00faltimo momento, envolvendo todos os recursos de uma vez, quando j\u00e1 \u00e9 tarde demais. O ZRAM utiliza um pouco da CPU para compress\u00e3o, mas na maioria dos sistemas com pouca mem\u00f3ria, isso afeta muito menos o desempenho do que a troca sem ZRAM.<\/p>\n<h1>Para concluir<\/h1>\n<p>\nVamos dar mais uma olhada no resultado:<\/p>\n<pre><code class=\"plaintext\">pi@raspberrypi:~ $ free -h\ntotal usado livre compartilhado buff\/cache dispon\u00edvel\nMem: 926Mi 471Mi 68Mi 168Mi 385Mi 232Mi\nSwap: 1.2Gi 258Mi 999Mi\n\npi@raspberrypi:~ $ sudo cat \/proc\/swaps \nFilename Type Size Used Priority\n\/var\/swap file 102396 0 -2\n\/dev\/zram0 partition 1185368 264448 5<\/code><\/pre>\n<p>\n264448 em ZRAM significa quase um gigabyte de dados descompactados. Tudo foi para o ZRAM e nada foi para o arquivo de swap, que \u00e9 muito mais lento. Experimente essas configura\u00e7\u00f5es, elas funcionam em todos os modelos do Raspberry Pi. Meu sistema travado se transformou em um sistema funcional e est\u00e1vel.<\/p>\n<p>Espero em breve continuar e atualizar este artigo com alguns resultados dos testes do sistema antes e depois da instala\u00e7\u00e3o do ZRAM. Atualmente, simplesmente n\u00e3o tenho tempo para isso. Enquanto isso, n\u00e3o hesite em fazer seus pr\u00f3prios testes e me avise nos coment\u00e1rios. O Raspberry Pi 4 \u00e9 realmente uma m\u00e1quina com essas configura\u00e7\u00f5es. Aproveite!<\/p>\n<blockquote><p><b>Sobre o tema:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/linux-performance-almost-always-add-swap-space\/\">Desempenho do Linux: por que voc\u00ea quase sempre deve aumentar a \u00e1rea de swap<\/a><\/noindex> (2017)\n<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/linux-performance-almost-always-add-swap-part2-zram\/\">Desempenho do Linux: quase sempre aumente a \u00e1rea de swap. Parte 2: ZRAM<\/a><\/noindex> (2020)<\/li>\n<\/ul>\n<\/blockquote>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/504468\/\">habr.com<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u0430\u0440\u0443 \u043d\u0435\u0434\u0435\u043b\u044c \u043d\u0430\u0437\u0430\u0434 \u044f \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043e\u0431\u0437\u043e\u0440 Pinebook Pro. \u041f\u043e\u0441\u043a\u043e\u043b\u044c\u043a\u0443 Raspberry Pi 4 \u0442\u043e\u0436\u0435 \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u0430 \u043d\u0430 ARM, \u0442\u043e \u0434\u043b\u044f \u043d\u0435\u0451 \u0432\u043f\u043e\u043b\u043d\u0435 \u043f\u043e\u0434\u0445\u043e\u0434\u044f\u0442 \u043d\u0435\u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u0438\u0437 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0439, \u0443\u043f\u043e\u043c\u044f\u043d\u0443\u0442\u044b\u0445 \u0432 \u043f\u0440\u0435\u0434\u044b\u0434\u0443\u0449\u0435\u0439 \u0441\u0442\u0430\u0442\u044c\u0435. \u0425\u043e\u0442\u0435\u043b \u0431\u044b \u043f\u043e\u0434\u0435\u043b\u0438\u0442\u044c\u0441\u044f \u044d\u0442\u0438\u043c\u0438 \u0445\u0438\u0442\u0440\u043e\u0441\u0442\u044f\u043c\u0438 \u0438 \u0443\u0437\u043d\u0430\u0442\u044c, \u043f\u0440\u043e\u044f\u0432\u044f\u0442\u0441\u044f \u043b\u0438 \u0443 \u0432\u0430\u0441 \u0442\u0430\u043a\u0438\u0435 \u0436\u0435 \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u044f \u0432 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438. \u041f\u043e\u0441\u043b\u0435 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 Raspberry Pi \u0432 \u0441\u0432\u043e\u044e \u0434\u043e\u043c\u0430\u0448\u043d\u044e\u044e \u0441\u0435\u0440\u0432\u0435\u0440\u043d\u0443\u044e \u044f \u0437\u0430\u043c\u0435\u0442\u0438\u043b, \u0447\u0442\u043e [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":83512,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[688],"tags":[],"class_list":["post-83511","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041f\u0430\u0440\u0443 \u043d\u0435\u0434\u0435\u043b\u044c \u043d\u0430\u0437\u0430\u0434 \u044f \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u043e\u0431\u0437\u043e\u0440 Pinebook Pro.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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