{"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\/pl\/blog\/news\/novyj-metod-upravleniya-pamyatyu-ot-facebook","title":{"rendered":"Nowa metoda zarz\u0105dzania pami\u0119ci\u0105 od Facebooka","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Cz\u0142onek zespo\u0142u rozwoju sieci spo\u0142eczno\u015bciowej <strong>Facebook<\/strong>, <strong>Roman Gu\u0161\u010din<\/strong>, zaproponowa\u0142 w newsletterze deweloper\u00f3w zestaw <strong>poprawek do j\u0105dra Linux<\/strong>, maj\u0105cy na celu popraw\u0119 zarz\u0105dzania pami\u0119ci\u0105 poprzez wdro\u017cenie nowego kontrolera sterowania ni\u0105 \u2014  <strong>slab (kontroler pami\u0119ci slab)<\/strong>.<\/p>\n<p><strong>Przydzielanie slab<\/strong> \u2013 to mechanizm zarz\u0105dzania pami\u0119ci\u0105, zaprojektowany w celu bardziej efektywnego przydzielania pami\u0119ci i zminimalizowania znacznej fragmentacji. Podstaw\u0105 tego algorytmu jest zachowanie przydzielonej pami\u0119ci, zawieraj\u0105cej obiekt okre\u015blonego typu, oraz ponowne wykorzystanie tej pami\u0119ci przy nast\u0119pnym przydzieleniu dla obiektu tego samego typu. Metoda ta zosta\u0142a po raz pierwszy wprowadzona w systemie SunOS przez Jeffa Bonwicka i jest obecnie szeroko stosowana w j\u0105drach wielu system\u00f3w operacyjnych Unix, w tym FreeBSD i Linux.<\/p>\n<p>Podstaw\u0105 nowego kontrolera jest przeniesienie \u015bledzenia slab z poziomu stron pami\u0119ci na poziom obiekt\u00f3w j\u0105dra, co umo\u017cliwia wsp\u00f3\u0142dzielenie jednej strony slab w r\u00f3\u017cnych cgroup, zamiast przydzielania oddzielnej pami\u0119ci podr\u0119cznej dla ka\u017cdej z cgroup.<\/p>\n<p>Z przeprowadzonych test\u00f3w wynika, \u017ce zaproponowana metoda zarz\u0105dzania pami\u0119ci\u0105 pozwala zwi\u0119kszy\u0107 <strong>efektywno\u015b\u0107<\/strong> u\u017cytkowania slab <strong>do 45%<\/strong>, a tak\u017ce zmniejszy\u0107 ca\u0142kowite zu\u017cycie pami\u0119ci przez j\u0105dro systemu operacyjnego. Zmniejszenie liczby przydzielanych stron slab redukuje r\u00f3wnie\u017c fragmentacj\u0119 pami\u0119ci jako ca\u0142o\u015bci, co nie mo\u017ce nie wp\u0142yn\u0105\u0107 na wydajno\u015b\u0107 systemu.<\/p>\n<p>Nowy kontroler jest ju\u017c testowany na serwerach roboczych Facebooka od kilku miesi\u0119cy, a dotychczasowe testy mo\u017cna uzna\u0107 za udane: przy braku utraty wydajno\u015bci oraz wzrostu liczby b\u0142\u0119d\u00f3w zaobserwowano wyra\u017ane zmniejszenie u\u017cycia pami\u0119ci \u2014 na niekt\u00f3rych serwerach do 1 GB. Ta liczba jest do\u015b\u0107 subiektywna, poniewa\u017c wcze\u015bniej przeprowadzone testy wykaza\u0142y nieco ni\u017csze wyniki:<\/p>\n<ul>\n<li>650-700 MB na froncie webowym<\/li>\n<li>750-800 MB na serwerze z pami\u0119ci\u0105 podr\u0119czn\u0105 baz danych<\/li>\n<li>700 MB na serwerze DNS<\/li>\n<\/ul>\n<p><noindex><noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/github.com\/rgushchin\">Strona autora na GitHubie<\/a><\/p>\n<p><\/noindex><\/noindex><br \/>\n<noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/lwn.net\/Articles\/798605\/\">Wyniki wcze\u015bniejszych test\u00f3w<\/a><\/p>\n<p><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <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 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\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 5.0.1.1 - 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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