{"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\/sv\/blog\/administrirovanie\/proizvoditelnost-raspberry-pi-dobavlyaem-zram-i-izmenyaem-parametry-yadra","title":{"rendered":"Prestanda f\u00f6r Raspberry Pi: vi l\u00e4gger till ZRAM och \u00e4ndrar k\u00e4rninst\u00e4llningarna","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>F\u00f6r ett par veckor sedan publicerade jag <noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/pinebook-pro-my-first-impressions-and-setup-tips\/\">en recension av Pinebook Pro<\/a><\/noindex>. Eftersom Raspberry Pi 4 ocks\u00e5 \u00e4r baserad p\u00e5 ARM, passar vissa av de optimeringar som n\u00e4mndes i den tidigare artikeln alldeles utm\u00e4rkt f\u00f6r den. Jag skulle vilja dela med mig av dessa knep och se om ni upplever liknande f\u00f6rb\u00e4ttringar i prestanda.<\/p>\n<p>Efter att ha installerat Raspberry Pi i min <noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/home-lab-beginners-guide-hardware\/\">hemmaserver<\/a><\/noindex> m\u00e4rkte jag att den blev mycket oresponsiv och till och med fr\u00f6s under perioder av brist p\u00e5 RAM. F\u00f6r att l\u00f6sa detta problem la jag till ZRAM och gjorde n\u00e5gra \u00e4ndringar i k\u00e4rninst\u00e4llningarna.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><\/p>\n<h1>Aktivering av ZRAM p\u00e5 Raspberry Pi<\/h1>\n<p>\n<img decoding=\"async\" alt=\"Prestanda f\u00f6r Raspberry Pi: vi l\u00e4gger till ZRAM och \u00e4ndrar k\u00e4rninst\u00e4llningarna\" 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> skapar ett block-lagringsutrymme i RAM-minnet som heter \/dev\/zram0 (eller 1, 2, 3 etc.). Sidor som skrivs dit komprimeras och sparas i minnet. Detta m\u00f6jligg\u00f6r mycket snabb in\/ut-l\u00e4sning och frig\u00f6r minne genom komprimering.<\/p>\n<p>Raspberry Pi 4 levereras med 1, 2, 4 eller 8 GB RAM. Jag kommer att anv\u00e4nda modellen med 1 GB, s\u00e5 justera instruktionerna beroende p\u00e5 din modell. Med 1 GB kommer ZRAMs standardv\u00e4xlingsfil (som \u00e4r l\u00e5ngsam!) att anv\u00e4ndas mer s\u00e4llan. Jag anv\u00e4nde ett s\u00e5dant skript <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/foundObjects\/zram-swap\">zram-swap<\/a><\/noindex> f\u00f6r att installera och automatiskt konfigurera.<\/p>\n<p>Instruktionerna finns i repot via l\u00e4nken ovan. Installation:<\/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>\nOm du vill redigera konfigurationen:<\/p>\n<pre><code class=\"bash\">vi \/etc\/default\/zram-swap<\/code><\/pre>\n<p>\nDessutom kan du aktivera ZRAM genom att installera <code>zram-tools<\/code>. <b>Om du anv\u00e4nder denna metod, se till att redigera konfigurationen<\/b> i filen <code>\/etc\/default\/zramswap<\/code>, och st\u00e4ll in cirka 1 GB ZRAM:<\/p>\n<pre><code class=\"bash\">sudo apt install zram-tools<\/code><\/pre>\n<p>\nEfter installationen kan du visa statistiken f\u00f6r ZRAM-lagringen med f\u00f6ljande kommando:<\/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>L\u00e4gg till k\u00e4rnparametrar f\u00f6r b\u00e4ttre anv\u00e4ndning av ZRAM<\/h1>\n<p>\nNu ska vi r\u00e4tta till systemets beteende n\u00e4r Raspberry Pi v\u00e4xlar till v\u00e4xling i sista minuten, vilket ofta leder till fryskador. L\u00e5t oss l\u00e4gga till n\u00e5gra rader i filen <b>\/etc\/sysctl.conf<\/b> och starta om.<\/p>\n<p>Dessa rader 1) <b>kommer att skjuta upp den oundvikliga minnesbristen<\/b>, vilket \u00f6kar trycket p\u00e5 k\u00e4rncacheminnet, och 2) <b>b\u00f6rjar tidigare att f\u00f6rbereda sig f\u00f6r minnesbristen<\/b>, genom att p\u00e5 f\u00f6rhand initiera v\u00e4xlingen. Men detta kommer att vara en mycket mer effektiv v\u00e4xling med komprimerat minne via ZRAM!<\/p>\n<p>H\u00e4r \u00e4r de rader som ska l\u00e4ggas till i slutet av filen <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>\nD\u00e4refter startar vi om systemet eller aktiverar \u00e4ndringarna med f\u00f6ljande kommando:<\/p>\n<pre><code class=\"bash\">sudo sysctl --system<\/code><\/pre>\n<p>\n<b>vm.vfs_cache_pressure=500<\/b> \u00f6kar trycket p\u00e5 cachen, vilket \u00f6kar k\u00e4rnans ben\u00e4genhet att \u00e5tervinna minnet som anv\u00e4nds f\u00f6r att cachelagra katalog- och indexobjekt. Du kommer att anv\u00e4nda mindre minne under en l\u00e4ngre tidsperiod. Det skarpa prestandafallet motverkas genom att tidigare svapa.<\/p>\n<p><b>vm.swappiness=100<\/b> \u00f6kar parametern f\u00f6r hur aggressivt k\u00e4rnan kommer att svapa minnessidor, eftersom vi f\u00f6rst anv\u00e4nder ZRAM.<\/p>\n<p><b>vm.dirty_background_ratio=1 &amp; vm.dirty_ratio=50<\/b> \u2014 bakgrundsprocesser b\u00f6rjar skriva omedelbart n\u00e4r de n\u00e5r gr\u00e4nsen p\u00e5 1%, men systemet tvingar inte synkront in- och utdata f\u00f6rr\u00e4n det n\u00e5r dirty_ratio p\u00e5 50%.<\/p>\n<p>Dessa fyra rader (n\u00e4r de anv\u00e4nds med ZRAM) kommer att bidra till att f\u00f6rb\u00e4ttra prestanda om du har <u>oundvikligen<\/u> slut p\u00e5 RAM-minnet och b\u00f6rjar svapa, som jag g\u00f6r. Medveten om detta faktum och med tanke p\u00e5 att minneskomprimeringen i ZRAM fungerar tre g\u00e5nger b\u00e4ttre, \u00e4r det bra att b\u00f6rja denna svapning i f\u00f6rv\u00e4g.<\/p>\n<p>Trycket p\u00e5 cachen hj\u00e4lper eftersom vi faktiskt s\u00e4ger till k\u00e4rnan: \"Hej, lyssna, jag har inget extra minne att anv\u00e4nda f\u00f6r cache, s\u00e5 sn\u00e4lla, bli av med det s\u00e5 snart som m\u00f6jligt och beh\u00e5ll bara de mest anv\u00e4nda\/viktiga data.\"<\/p>\n<p>\u00c4ven med minskat cachelagring, om st\u00f6rre delen av det installerade minnet \u00e4r upptaget \u00f6ver tid, kommer k\u00e4rnan att b\u00f6rja opportunistisk svap l\u00e5ngt tidigare, s\u00e5 att processorn (komprimering) och swap-in\/ut inte drar ut p\u00e5 det till sista minuten och anv\u00e4nder alla resurser p\u00e5 en g\u00e5ng n\u00e4r det redan \u00e4r f\u00f6r sent. ZRAM anv\u00e4nder lite CPU f\u00f6r komprimering, men i de flesta system med liten m\u00e4ngd minne p\u00e5verkar det prestandan mycket mindre \u00e4n svap utan ZRAM.<\/p>\n<h1>Avslutningsvis<\/h1>\n<p>\nL\u00e5t oss ta en titt p\u00e5 resultatet igen:<\/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 i ZRAM \u2014 det \u00e4r n\u00e4stan en gigabyte okomprimerade data. Allt gick till ZRAM och ingenting n\u00e5dde den mycket l\u00e5ngsammare swap-filen. Prova dessa inst\u00e4llningar sj\u00e4lva, de fungerar p\u00e5 alla modeller av Raspberry Pi. Jag gick fr\u00e5n ett segt, h\u00e4ngande system till ett funktionellt och stabilt.<\/p>\n<p>I hope to continue and update this article with some test results from the system before and after installing ZRAM in the near future. Right now, I simply don't have the time for it. In the meantime, feel free to conduct your own tests and let me know in the comments. The Raspberry Pi 4 is a beast with these settings. Enjoy!<\/p>\n<blockquote><p><b>P\u00e5 \u00e4mnet:<\/b><\/p>\n<ul>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/linux-performance-almost-always-add-swap-space\/\">Prestanda f\u00f6r Linux: varf\u00f6r man n\u00e4stan alltid b\u00f6r \u00f6ka swapomr\u00e5det<\/a><\/noindex> (2017)\n<\/li>\n<li><noindex><a rel=\"nofollow\" href=\"https:\/\/haydenjames.io\/linux-performance-almost-always-add-swap-part2-zram\/\">Prestanda f\u00f6r Linux: \u00f6ka alltid swapomr\u00e5det. Del 2: ZRAM<\/a><\/noindex> (2020)<\/li>\n<\/ul>\n<\/blockquote>\n<p>K\u00e4lla: <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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