{"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\/cs\/blog\/news\/novyj-metod-upravleniya-pamyatyu-ot-facebook","title":{"rendered":"Nov\u00e1 metoda spr\u00e1vy pam\u011bti od Facebooku","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Jeden z \u010dlen\u016f v\u00fdvojov\u00e9ho t\u00fdmu soci\u00e1ln\u00ed s\u00edt\u011b <strong>Facebook<\/strong>, <strong>Roman Gu\u0161in<\/strong>, navrhl v mailing listu v\u00fdvoj\u00e1\u0159\u016f sadu <strong>patch\u016f pro j\u00e1dro Linuxu<\/strong>, zam\u011b\u0159en\u00fdch na zlep\u0161en\u00ed pr\u00e1ce s pam\u011bt\u00ed prost\u0159ednictv\u00edm implementace nov\u00e9ho \u0159\u00eddic\u00edho kontrol\u00e9ru -  <strong>slab (slab memory controller)<\/strong>.<\/p>\n<p><strong>Distribuce slab<\/strong> \u2013 je mechanismus \u0159\u00edzen\u00ed pam\u011bti, ur\u010den\u00fd pro efektivn\u011bj\u0161\u00ed rozd\u011blen\u00ed pam\u011bti a odstran\u011bn\u00ed v\u00fdrazn\u00e9 fragmentace. Z\u00e1kladem tohoto algoritmu je uchov\u00e1n\u00ed p\u0159id\u011blen\u00e9 pam\u011bti, kter\u00e1 obsahuje objekt ur\u010dit\u00e9ho typu, a op\u011btovn\u00e9 vyu\u017eit\u00ed t\u00e9to pam\u011bti p\u0159i p\u0159\u00ed\u0161t\u00edm p\u0159id\u011blen\u00ed pro objekt t\u00e9ho\u017e typu. Tato metoda byla poprv\u00e9 p\u0159edstavena v SunOS Jeffem Bonwickem a dnes se \u0161iroce pou\u017e\u00edv\u00e1 v j\u00e1drech mnoha opera\u010dn\u00edch syst\u00e9m\u016f Unix, v\u010detn\u011b FreeBSD a Linuxu.<\/p>\n<p>Na z\u00e1klad\u011b nov\u00e9ho \u0159adi\u010de le\u017e\u00ed p\u0159enos sledov\u00e1n\u00ed slab z \u00farovn\u011b str\u00e1nek pam\u011bti na \u00farove\u0148 objekt\u016f j\u00e1dra, co\u017e umo\u017e\u0148uje sd\u00edlen\u00ed jedn\u00e9 slab-str\u00e1nky v r\u016fzn\u00fdch cgroups, m\u00edsto alokace samostatn\u00e9 cache pro ka\u017edou cgroup.<\/p>\n<p>Z v\u00fdsledk\u016f testov\u00e1n\u00ed vypl\u00fdv\u00e1, \u017ee navr\u017een\u00e1 metoda spr\u00e1vy pam\u011bti umo\u017e\u0148uje zv\u00fd\u0161it <strong>efektivitu<\/strong> vyu\u017e\u00edv\u00e1n\u00ed slab <strong>a\u017e o 45%<\/strong>, a tak\u00e9 sn\u00ed\u017e\u00ed celkovou spot\u0159ebu pam\u011bti j\u00e1drem OS. Tak\u00e9 d\u00edky zmen\u0161en\u00ed po\u010dtu alokovan\u00fdch slab str\u00e1nek doch\u00e1z\u00ed k \u00faprav\u011b fragmentace pam\u011bti v celku, co\u017e nem\u016f\u017ee ale neovlivnit v\u00fdkonnost syst\u00e9mu.<\/p>\n<p>Nov\u00fd kontrol\u00e9r se ji\u017e n\u011bkolik m\u011bs\u00edc\u016f testuje na pracovn\u00edch serverech Facebooku, a zat\u00edm lze toto testov\u00e1n\u00ed ozna\u010dit za \u00fasp\u011b\u0161n\u00e9: p\u0159i absenci ztr\u00e1t na v\u00fdkonnosti a zv\u00fd\u0161en\u00ed po\u010dtu chyb bylo zaznamen\u00e1no v\u00fdrazn\u00e9 sn\u00ed\u017een\u00ed spot\u0159eby pam\u011bti - na n\u011bkter\u00fdch serverech a\u017e 1 GB. Toto \u010d\u00edslo je pom\u011brn\u011b subjektivn\u00ed, nap\u0159\u00edklad d\u0159\u00edve proveden\u00e9 testy uk\u00e1zaly o n\u011bco men\u0161\u00ed v\u00fdsledky:<\/p>\n<ul>\n<li>650-700 MB na webov\u00e9m front-endu<\/li>\n<li>750-800 MB na serveru s datov\u00fdm cache<\/li>\n<li>700 MB na DNS serveru<\/li>\n<\/ul>\n<p><noindex><noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/github.com\/rgushchin\">Str\u00e1nka autora na GitHubu<\/a><\/p>\n<p><\/noindex><\/noindex><br \/>\n<noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/798605\/\">V\u00fdsledky ran\u00fdch test\u016f<\/a><\/p>\n<p><\/noindex><\/p>\n<p>Zdroj: <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, 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