{"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\/sk\/blog\/administrirovanie\/proizvoditelnost-raspberry-pi-dobavlyaem-zram-i-izmenyaem-parametry-yadra","title":{"rendered":"V\u00fdkon Raspberry Pi: prid\u00e1vame ZRAM a men\u00edme parametre jadra","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Pred p\u00e1r t\u00fd\u017ed\u0148ami som publikoval <noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/pinebook-pro-my-first-impressions-and-setup-tips\/\">prezreview Pinebook Pro<\/a><\/noindex>. Ke\u010f\u017ee Raspberry Pi 4 je tie\u017e zalo\u017een\u00e1 na architekt\u00fare ARM, niektor\u00e9 optimaliz\u00e1cie spomenut\u00e9 v predch\u00e1dzaj\u00facom \u010dl\u00e1nku s\u00fa pre \u0148u vhodn\u00e9. Chcel by som sa podeli\u0165 o tieto triky a zisti\u0165, \u010di sa u v\u00e1s prejavia podobn\u00e9 zlep\u0161enia v\u00fdkonu.<\/p>\n<p>Po nain\u0161talovan\u00ed Raspberry Pi do svojho <noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/home-lab-beginners-guide-hardware\/\">dom\u00e1ceho servera<\/a><\/noindex> som si v\u0161imol, \u017ee v momentoch nedostatku opera\u010dnej pam\u00e4te sa st\u00e1vala ve\u013emi necitlivou a dokonca zam\u0155zala. Aby som tento probl\u00e9m vyrie\u0161il, pridal som ZRAM a vykonal nieko\u013eko zmien v parametroch jadra.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h1>Aktiv\u00e1cia ZRAM na Raspberry Pi<\/h1>\n<p>\n<img decoding=\"async\" alt=\"V\u00fdkon Raspberry Pi: prid\u00e1vame ZRAM a men\u00edme parametre jadra\" 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> vytv\u00e1ra v opera\u010dnej pam\u00e4ti blokov\u00e9 \u00falo\u017eisko s n\u00e1zvom \/dev\/zram0 (alebo 1, 2, 3 at\u010f.). Str\u00e1nky zapisovan\u00e9 tam sa komprimuj\u00fa a uchov\u00e1vaj\u00fa v pam\u00e4ti. To umo\u017e\u0148uje ve\u013emi r\u00fdchlu vstupno-v\u00fdstupn\u00fa oper\u00e1ciu a tie\u017e uvo\u013e\u0148uje pam\u00e4\u0165 kompresiou.<\/p>\n<p>Raspberry Pi 4 je dod\u00e1van\u00e1 s 1, 2, 4 alebo 8 GB opera\u010dnej pam\u00e4te. Ja budem pou\u017e\u00edva\u0165 model s 1 GB, preto si prisp\u00f4sobte in\u0161trukcie pod\u013ea svojej modelu. Pri 1 GB ZRAM sa predvolen\u00fd swapovac\u00ed s\u00fabor (pomal\u00fd!) bude pou\u017e\u00edva\u0165 menej \u010dasto. Pou\u017eil som tento skript <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/foundObjects\/zram-swap\">zram-swap<\/a><\/noindex> na in\u0161tal\u00e1ciu a automatick\u00e9 nastavenie.<\/p>\n<p>In\u0161trukcie s\u00fa uveden\u00e9 v repozit\u00e1ri na vy\u0161\u0161ie uvedenom odkaze. In\u0161tal\u00e1cia:<\/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>\nAk chcete upravi\u0165 konfigur\u00e1ciu:<\/p>\n<pre><code class=\"bash\">vi \/etc\/default\/zram-swap<\/code><\/pre>\n<p>\nOkrem toho m\u00f4\u017eete ZRAM aktivova\u0165 in\u0161tal\u00e1ciou <code>zram-tools<\/code>. <b>Ak pou\u017e\u00edvate tento sp\u00f4sob, ur\u010dite upravte konfigur\u00e1ciu<\/b> v s\u00fabore <code>\/etc\/default\/zramswap<\/code>, a nastavte pribli\u017ene 1 GB ZRAM:<\/p>\n<pre><code class=\"bash\">sudo apt install zram-tools<\/code><\/pre>\n<p>\nPo in\u0161tal\u00e1cii m\u00f4\u017eete zobrazi\u0165 \u0161tatistiku \u00falo\u017eiska ZRAM nasleduj\u00facou pr\u00edkazom:<\/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>Prid\u00e1me parametre jadra pre lep\u0161ie vyu\u017eitie ZRAM<\/h1>\n<p>\nTeraz oprav\u00edme spr\u00e1vanie syst\u00e9mu, ke\u010f Raspberry Pi prech\u00e1dza na swap a\u017e v poslednej chv\u00edli, \u010do \u010dasto vedie k zam\u0155zaniu. Prid\u00e1me nieko\u013eko riadkov do s\u00faboru <b>\/etc\/sysctl.conf<\/b> a re\u0161tartujeme.<\/p>\n<p>Tieto riadky 1) <b>odsun\u00fa nevyhnutn\u00fd pokles pam\u00e4te<\/b>, zv\u00fd\u0161en\u00edm tlaku na jadrov\u00fd cache a 2) <b>sk\u00f4r za\u010dn\u00fa pripravova\u0165 na pokles pam\u00e4te<\/b>, vopred iniciovan\u00edm swapovania. Ale to bude ove\u013ea efekt\u00edvnej\u0161ie swapovanie komprimovanej pam\u00e4te prostredn\u00edctvom ZRAM!<\/p>\n<p>Tu s\u00fa riadky, ktor\u00e9 treba prida\u0165 na koniec s\u00faboru <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>\nPotom re\u0161tartujeme syst\u00e9m alebo aktivujeme \u00fapravy nasleduj\u00facou pr\u00edkazom:<\/p>\n<pre><code class=\"bash\">sudo sysctl --system<\/code><\/pre>\n<p>\n<b>vm.vfs_cache_pressure=500<\/b> zvy\u0161uje tlak na cache, \u010do zvy\u0161uje sklon jadra k rekultiv\u00e1cii pam\u00e4te pou\u017e\u00edvan\u00e9ho na cacheovanie objektov adres\u00e1rov a indexov. Budete pou\u017e\u00edva\u0165 menej pam\u00e4te po\u010das dlh\u0161ieho \u010dasov\u00e9ho obdobia. N\u00e1hly pokles v\u00fdkonu sa kompenzuje sk\u00f4r swapovan\u00edm.<\/p>\n<p><b>vm.swappiness=100<\/b> zvy\u0161uje parameter, ako agres\u00edvne bude jadro swapova\u0165 str\u00e1nky pam\u00e4te, ke\u010f\u017ee najprv pou\u017e\u00edvame ZRAM.<\/p>\n<p><b>vm.dirty_background_ratio=1 &amp; vm.dirty_ratio=50<\/b> \u2014 pozadie procesy za\u010dn\u00fa zapisova\u0165 okam\u017eite po dosiahnut\u00ed limitu 1%, ale syst\u00e9m nebude n\u00fatene vykon\u00e1va\u0165 synchronn\u00fd vstup-v\u00fdstup, k\u00fdm nedosiahneme dirty_ratio na 50%.<\/p>\n<p>Tieto \u0161tyri riadky (v pou\u017e\u00edvan\u00ed so ZRAM) pom\u00f4\u017eu zlep\u0161i\u0165 v\u00fdkon v pr\u00edpade, ak m\u00e1te <u>nevyhnutne<\/u> nedostatok opera\u010dnej pam\u00e4te a za\u010dne sa prechod na swap, ako u m\u0148a. Ke\u010f\u017ee si som vedom\u00fd tejto skuto\u010dnosti a taktie\u017e zoh\u013ead\u0148ujem kompresiu pam\u00e4te v ZRAM, je ove\u013ea lep\u0161ie za\u010da\u0165 toto swapovanie sk\u00f4r.<\/p>\n<p>Tlak na cache pom\u00e1ha, preto\u017ee vlastne hovor\u00edme jadru: \"Hej, po\u010d\u00favaj, nem\u00e1m \u010fal\u0161iu pam\u00e4\u0165, aby som ju mohol pou\u017e\u00edva\u0165 na cache, preto \u0165a pros\u00edm, zbav sa jej \u010do najsk\u00f4r a uchov\u00e1vaj len naj\u010dastej\u0161ie pou\u017e\u00edvan\u00e9\/d\u00f4le\u017eit\u00e9 d\u00e1ta\".<\/p>\n<p>Aj pri zn\u00ed\u017een\u00ed cacheovania, ak \u010dasom bude v\u00e4\u010d\u0161ina nain\u0161talovanej pam\u00e4te obsaden\u00e1, jadro za\u010dne oportunistick\u00e9 swapovanie ove\u013ea sk\u00f4r, tak procesor (kompresia) a vstup\/v\u00fdstup swapovania nebud\u00fa \u010daka\u0165 na posledn\u00fa chv\u00ed\u013eu a za\u0165a\u017eova\u0165 v\u0161etky zdroje naraz, ke\u010f u\u017e bude pr\u00edli\u0161 neskoro. ZRAM pou\u017e\u00edva trochu CPU na kompresiu, ale v v\u00e4\u010d\u0161ine syst\u00e9mov s mal\u00fdm objemom pam\u00e4te to m\u00e1 ove\u013ea men\u0161\u00ed dopad na v\u00fdkon ne\u017e swap bez ZRAM.<\/p>\n<h1>Na z\u00e1ver<\/h1>\n<p>\nPozrime sa e\u0161te raz na v\u00fdsledok:<\/p>\n<pre><code class=\"plaintext\">pi@raspberrypi:~ $ free -h\ntotal used free shared buff\/cache available\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 v ZRAM \u2014 to je takmer jeden gigabajt nescompressovan\u00fdch d\u00e1t. V\u0161etko sa dostalo do ZRAM a ni\u010d ne\u0161lo do ove\u013ea pomal\u0161ieho swap s\u00faboru. Vysk\u00fa\u0161ajte si tieto nastavenia, funguj\u00fa na v\u0161etk\u00fdch modeloch Raspberry Pi. M\u00f4j nefunk\u010dn\u00fd, zamrznut\u00fd syst\u00e9m sa stal funk\u010dn\u00fdm a stabiln\u00fdm.<\/p>\n<p>V najbli\u017e\u0161ej bud\u00facnosti d\u00fafam, \u017ee sa mi podar\u00ed pokra\u010dova\u0165 v aktualiz\u00e1cii tohto \u010dl\u00e1nku s niektor\u00fdmi v\u00fdsledkami testovania syst\u00e9mu pred a po in\u0161tal\u00e1cii ZRAM. Teraz na to jednoducho nem\u00e1m \u010das. A zatia\u013e sa nebojte robi\u0165 vlastn\u00e9 testy a dajte mi vedie\u0165 v koment\u00e1roch. Raspberry Pi 4 je s tak\u00fdmito nastaveniami skuto\u010dne v\u00ed\u0165az. U\u017eite si to!<\/p>\n<blockquote><p><b>Na t\u00e9mu:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/linux-performance-almost-always-add-swap-space\/\">V\u00fdkon Linuxu: pre\u010do takmer v\u017edy potrebujete zv\u00fd\u0161i\u0165 str\u00e1nkovac\u00ed priestor<\/a><\/noindex> (2017)\n<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/linux-performance-almost-always-add-swap-part2-zram\/\">V\u00fdkon Linuxu: takmer v\u017edy zv\u00fd\u0161te str\u00e1nkovac\u00ed priestor. \u010cas\u0165 2: ZRAM<\/a><\/noindex> (2020)<\/li>\n<\/ul>\n<\/blockquote>\n<p>Zdroj: <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 5.0.4 - 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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