{"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\/fr\/blog\/news\/novyj-metod-upravleniya-pamyatyu-ot-facebook","title":{"rendered":"Une nouvelle m\u00e9thode de gestion de la m\u00e9moire par Facebook","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Un des membres de l'\u00e9quipe de d\u00e9veloppement du r\u00e9seau social <strong>Facebook<\/strong>, <strong>Roman Gouchine<\/strong>, a propos\u00e9 dans la mailing list des d\u00e9veloppeurs un ensemble de <strong>patchs pour le noyau Linux<\/strong>, visant \u00e0 am\u00e9liorer la gestion de la m\u00e9moire gr\u00e2ce \u00e0 la mise en \u0153uvre d'un nouveau contr\u00f4leur de gestion de celle-ci \u2014  <strong>slab (contr\u00f4leur de m\u00e9moire slab)<\/strong>.<\/p>\n<p><strong>La distribution slab<\/strong> \u2013 est un m\u00e9canisme de gestion de la m\u00e9moire, destin\u00e9 \u00e0 une allocation plus efficace de la m\u00e9moire et \u00e0 l'\u00e9limination d'une fragmentation significative. La base de cet algorithme est de conserver la m\u00e9moire allou\u00e9e contenant un objet d'un type particulier, et de r\u00e9utiliser cette m\u00e9moire lors de l'allocation suivante pour un objet du m\u00eame type. Cette m\u00e9thode a \u00e9t\u00e9 introduite pour la premi\u00e8re fois dans SunOS par Jeff Bonwick et est maintenant largement utilis\u00e9e dans les noyaux de nombreux syst\u00e8mes d'exploitation Unix, y compris FreeBSD et Linux.<\/p>\n<p>\u00c0 la base du nouveau contr\u00f4leur se trouve le transfert du suivi slab du niveau des pages de m\u00e9moire au niveau des objets du noyau, ce qui permet le partage d'une page slab entre diff\u00e9rentes cgroups, plut\u00f4t que d'allouer un cache s\u00e9par\u00e9 pour chaque cgroup.<\/p>\n<p>Les r\u00e9sultats des tests indiquent que la m\u00e9thode de gestion de la m\u00e9moire propos\u00e9e permet d'accro\u00eetre <strong>l'efficacit\u00e9<\/strong> de l'utilisation de slab <strong>jusqu'\u00e0 45%<\/strong>, et r\u00e9duit \u00e9galement la consommation globale de m\u00e9moire par le noyau OS. De plus, en r\u00e9duisant le nombre de pages allou\u00e9es pour slab, la fragmentation de la m\u00e9moire globale diminue, ce qui ne peut que b\u00e9n\u00e9ficier \u00e0 la r\u00e9activit\u00e9 du syst\u00e8me.<\/p>\n<p>Le nouveau contr\u00f4leur est en test sur les serveurs de travail de Facebook depuis plusieurs mois, et jusqu'\u00e0 pr\u00e9sent, ces tests peuvent \u00eatre qualifi\u00e9s de r\u00e9ussis : sans perte de performances et sans augmentation du nombre d'erreurs, une r\u00e9duction \u00e9vidente de la consommation de m\u00e9moire a \u00e9t\u00e9 observ\u00e9e \u2014 sur certains serveurs, jusqu'\u00e0 1 Go. Ce chiffre est assez subjectif, par exemple, des tests pr\u00e9c\u00e9demment effectu\u00e9s avaient montr\u00e9 des r\u00e9sultats l\u00e9g\u00e8rement inf\u00e9rieurs :<\/p>\n<ul>\n<li>650-700 Mo sur le front-end web<\/li>\n<li>750-800 Mo sur un serveur avec cache de base de donn\u00e9es<\/li>\n<li>700 Mo sur un serveur DNS<\/li>\n<\/ul>\n<p><noindex><noindex><\/p>\n<p>&gt;&gt;&gt; <a rel=\"nofollow\" href=\"https:\/\/github.com\/rgushchin\">Page de l'auteur sur 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\/\">R\u00e9sultats des tests pr\u00e9liminaires<\/a><\/p>\n<p><\/noindex><\/p>\n<p>Source : <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 5.0.2 - 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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