{"id":79051,"date":"2020-04-23T19:43:32","date_gmt":"2020-04-23T17:43:32","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/novyj-metod-upravleniya-pamyatyu-ot-facebook"},"modified":"2020-04-23T19:43:32","modified_gmt":"2020-04-23T17:43:32","slug":"novyj-metod-upravleniya-pamyatyu-ot-facebook","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sv\/blog\/news\/novyj-metod-upravleniya-pamyatyu-ot-facebook","title":{"rendered":"Ny metod f\u00f6r minneshantering fr\u00e5n Facebook","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>En av medlemmarna i utvecklarteamet f\u00f6r det sociala n\u00e4tverket <strong>Facebook<\/strong>, <strong>Roman Gushchin<\/strong>, f\u00f6reslog i utvecklarnas nyhetsbrev en upps\u00e4ttning <strong>patchar f\u00f6r Linux-k\u00e4rnan<\/strong>, riktad mot att f\u00f6rb\u00e4ttra minneshantering genom implementering av en ny kontrollenhet f\u00f6r detta \u2013  <strong>slab (slab memory controller)<\/strong>.<\/p>\n<p><strong>Slab-f\u00f6rdelning<\/strong> \u2013 \u00e4r en mekanism f\u00f6r minneshantering avsedd f\u00f6r mer effektiv minnesf\u00f6rdelning och eliminering av betydande fragmentering. Grunden f\u00f6r denna algoritm \u00e4r att bevara den allokerade minnet som inneh\u00e5ller ett objekt av en viss typ och \u00e5teranv\u00e4nda detta minne vid n\u00e4sta allokering f\u00f6r ett objekt av samma typ. Denna metod introducerades f\u00f6rst i SunOS av Jeff Bonwick och anv\u00e4nds nu i stor utstr\u00e4ckning i k\u00e4rnor f\u00f6r m\u00e5nga Unix-operativsystem, inklusive FreeBSD och Linux.<\/p>\n<p>I grunden f\u00f6r den nya kontrolleraren ligger flyttning av slab-redovisningen fr\u00e5n sidaniv\u00e5 i minnet till niv\u00e5er av k\u00e4rnobjekt, vilket m\u00f6jligg\u00f6r gemensam anv\u00e4ndning av en slab-sida i olika cgroup, ist\u00e4llet f\u00f6r att allokera en separat cache f\u00f6r varje cgroup.<\/p>\n<p>Resultaten av tester visar att den f\u00f6reslagna minneshanteringsmetoden kan \u00f6ka <strong>effektiviteten<\/strong> i slab-anv\u00e4ndningen <strong>med upp till 45%<\/strong>, och ocks\u00e5 minska det totala minnesf\u00f6rbrukningen av operativsystemets k\u00e4rna. Tack vare minskningen av antalet allokerade slab-sidor minskar \u00e4ven den allm\u00e4nna minnesfragmenteringen, vilket inte kan annat \u00e4n p\u00e5verka systemets prestanda.<\/p>\n<p>Den nya kontrollenheten har testats p\u00e5 Facebooks produktionsservrar i flera m\u00e5nader, och hittills kan man kalla dessa tester f\u00f6r framg\u00e5ngsrika: utan n\u00e5gra f\u00f6rluster i prestanda eller \u00f6kning av fel har en tydlig minskning av minnesf\u00f6rbrukningen observerats \u2013 p\u00e5 vissa servrar upp till 1 GB. Denna siffra \u00e4r ganska subjektiv, eftersom tidigare genomf\u00f6rda tester har visat n\u00e5got l\u00e4gre resultat:<\/p>\n<ul>\n<li>650-700 MB p\u00e5 webbgr\u00e4nssnittet<\/li>\n<li>750-800 MB p\u00e5 servern med databascache<\/li>\n<li>700 MB p\u00e5 DNS-servern<\/li>\n<\/ul>\n<p><noindex><noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/github.com\/rgushchin\">F\u00f6rfattarens profil p\u00e5 GitHub<\/a><\/p>\n<p><\/noindex><\/noindex><br \/>\n<noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/798605\/\">Resultaten fr\u00e5n tidigare tester<\/a><\/p>\n<p><\/noindex><\/p>\n<p>K\u00e4lla: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"http:\/\/www.linux.org.ru\/news\/linux-general\/15659654\">linux.org.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u0434\u0438\u043d \u0438\u0437 \u0447\u043b\u0435\u043d\u043e\u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0441\u043e\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 Facebook, \u0420\u043e\u043c\u0430\u043d \u0413\u0443\u0449\u0438\u043d, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0432 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0435 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u043d\u0430\u0431\u043e\u0440 \u0438\u0437 \u043f\u0430\u0442\u0447\u0435\u0439 \u0434\u043b\u044f \u044f\u0434\u0440\u0430 Linux, \u043d\u0430\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u043d\u044b\u0445 \u043d\u0430 \u0443\u043b\u0443\u0447\u0448\u0435\u043d\u0438\u0435 \u0440\u0430\u0431\u043e\u0442\u044b \u0441 \u043f\u0430\u043c\u044f\u0442\u044c\u044e \u0447\u0435\u0440\u0435\u0437 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e \u043d\u043e\u0432\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430 \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043e\u043d\u043e\u0439 &#8212; slab (slab memory \u0441ontroller). \u0420\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435 slab &ndash;\u2013 \u044d\u0442\u043e \u043c\u0435\u0445\u0430\u043d\u0438\u0437\u043c \u0443\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u044c\u044e, \u043f\u0440\u0435\u0434\u043d\u0430\u0437\u043d\u0430\u0447\u0435\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u0431\u043e\u043b\u0435\u0435 \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438 \u0438 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u044f \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0439 \u0444\u0440\u0430\u0433\u043c\u0435\u043d\u0442\u0430\u0446\u0438\u0438. \u041e\u0441\u043d\u043e\u0432\u043e\u0439 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-79051","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.4 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u0434\u0438\u043d \u0438\u0437 \u0447\u043b\u0435\u043d\u043e\u0432 \u043a\u043e\u043c\u0430\u043d\u0434\u044b \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0441\u043e\u0446\u0438\u0430\u043b\u044c\u043d\u043e\u0439 \u0441\u0435\u0442\u0438 Facebook, \u0420\u043e\u043c\u0430\u043d \u0413\u0443\u0449\u0438\u043d, 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