{"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\/da\/blog\/news\/novyj-metod-upravleniya-pamyatyu-ot-facebook","title":{"rendered":"En ny metode til hukommelsesstyring fra Facebook","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Et medlem af udviklingsteamet for det sociale netv\u00e6rk <strong>Facebook<\/strong>, <strong>Roman Gushchin<\/strong>, foreslog i en e-mail til udviklerne et s\u00e6t <strong>patches til Linux-kernen<\/strong>, der sigter mod at forbedre hukommelsesdriften gennem implementeringen af en ny kontrolenhed til den &#8212;  <strong>slab (slab memory controller)<\/strong>.<\/p>\n<p><strong>Slab-fordeling<\/strong> &ndash; er en hukommelsesstyringsmekanisme, der er designet til mere effektiv fordeling af hukommelse og eliminering af betydelig fragmentering. Grundlaget for denne algoritme er at bevare den tildelte hukommelse, der indeholder et objekt af en given type, og genbruge denne hukommelse ved n\u00e6ste tildeling til et objekt af samme type. Denne metode blev f\u00f8rst introduceret i SunOS af Jeff Bonwick og anvendes nu bredt i kernerne af mange Unix-operativsystemer, herunder FreeBSD og Linux.<\/p>\n<p>I den nye kontrolmekanisme er registreringen af slab flyttet fra sideniveauet til niveauet af kerneobjekter, hvilket muligg\u00f8r deling af en slab-side mellem forskellige cgroups i stedet for at tildele en separat cache til hver cgroup.<\/p>\n<p>If\u00f8lge testresultaterne tillader den foresl\u00e5ede hukommelsesstyring at forbedre <strong>effektiviteten<\/strong> af slab-brugen <strong>op til 45%<\/strong>, samt reducere det samlede hukommelsesforbrug i operativsystemets kerne. Desuden mindsker reduktionen i antallet af tildelte slab-sider fragmenteringen af hukommelsen som helhed, hvilket ikke kan undg\u00e5 at p\u00e5virke systemets ydeevne.<\/p>\n<p>Den nye kontrolenhed har v\u00e6ret under test p\u00e5 Facebooks produktionsservere i flere m\u00e5neder, og indtil videre kan man kalde denne test for vellykket: uden tab af ydeevne og med en stigning i antallet af fejl er der bem\u00e6rket en tydelig reduktion i hukommelsesforbruget &mdash; p\u00e5 nogle servere op til 1 GB. Dette tal er ret subjektivt, for eksempel viste tidligere udf\u00f8rte tests lidt mindre resultater:<\/p>\n<ul>\n<li>650-700 MB p\u00e5 webfrontend<\/li>\n<li>750-800 MB p\u00e5 databascache-serveren<\/li>\n<li>700 MB p\u00e5 DNS-serveren<\/li>\n<\/ul>\n<p><noindex><noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/github.com\/rgushchin\">Forfatterens side 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\/\">Resultaterne af tidlige tests<\/a><\/p>\n<p><\/noindex><\/p>\n<p>Kilde: <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 5.0.3 - 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, \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0432 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0435 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