{"id":79056,"date":"2020-04-24T01:42:07","date_gmt":"2020-04-23T23:42:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux"},"modified":"2020-04-24T01:42:07","modified_gmt":"2020-04-23T23:42:07","slug":"facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","title":{"rendered":"A Facebook \u00faj mem\u00f3riakezel\u00e9si mechanizmust aj\u00e1nlott a Linux kernel sz\u00e1m\u00e1ra.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Roman Gushchin (Roman Gushchin<\/a><\/noindex>) a Facebook t\u00e1rsas\u00e1gt\u00f3l k\u00f6zz\u00e9tett<\/a><\/noindex> a Linux kernel fejleszt\u0151i levelez\u0151list\u00e1j\u00e1n \u00faj mem\u00f3riaeloszt\u00f3 vez\u00e9rl\u0151 implement\u00e1ci\u00f3s patch-eket javasol slab<\/a><\/noindex> (slab mem\u00f3ria vez\u00e9rl\u0151). Az \u00faj vez\u00e9rl\u0151 kiemelked\u0151, mivel \u00e1thelyezi a slab nyilv\u00e1ntart\u00e1st a mem\u00f3riastruktur\u00e1k szintj\u00e9r\u0151l a kernel objektumok szintj\u00e9re, ami lehet\u0151v\u00e9 teszi a slab oldalak k\u00f6z\u00f6s haszn\u00e1lat\u00e1t k\u00fcl\u00f6nb\u00f6z\u0151 cgroup-k k\u00f6z\u00f6tt, ahelyett, hogy minden egyes cgroup sz\u00e1m\u00e1ra k\u00fcl\u00f6n slab cache-t allok\u00e1ln\u00e1nk. <\/p>\n

A javasolt megold\u00e1s lehet\u0151v\u00e9 teszi a slab haszn\u00e1lat\u00e1nak hat\u00e9konys\u00e1g\u00e1nak n\u00f6vel\u00e9s\u00e9t, 30-45%-kal cs\u00f6kkenti a slab mem\u00f3ria m\u00e9ret\u00e9t, \u00e9s jelent\u0151sen cs\u00f6kkenti a kernel \u00e1ltal haszn\u00e1lt mem\u00f3ria \u00f6sszmennyis\u00e9g\u00e9t. A nem mozgathat\u00f3 slab mennyis\u00e9g\u00e9nek cs\u00f6kkent\u00e9se szint\u00e9n kedvez\u0151 hat\u00e1ssal van a mem\u00f3riafragment\u00e1ci\u00f3 cs\u00f6kkent\u00e9s\u00e9re. Az \u00faj mem\u00f3ria vez\u00e9rl\u0151 jelent\u0151sen egyszer\u0171s\u00edti a slab nyilv\u00e1ntart\u00e1si k\u00f3dot, \u00e9s nem ig\u00e9nyli bonyolult algoritmusok alkalmaz\u00e1s\u00e1t a slab cache-ek dinamikus l\u00e9trehoz\u00e1s\u00e1hoz \u00e9s t\u00f6rl\u00e9s\u00e9hez minden cgroup eset\u00e9n. Az \u00faj implement\u00e1ci\u00f3ban az \u00f6sszes mem\u00f3ria cgroup k\u00f6z\u00f6s slab cache-t haszn\u00e1l, \u00e9s a slab cache-ek \u00e9letciklusa m\u00e1r nem k\u00f6t\u0151dik a cgroup \u00e1ltal be\u00e1ll\u00edtott \u00e9lettartamhoz. amelyek bizonyos Legacy BIOS-ra jellemz\u0151ek;<\/a><\/noindex> a mem\u00f3riahaszn\u00e1latra.<\/p>\n

Az \u00faj slab vez\u00e9rl\u0151ben megval\u00f3s\u00edtott pontosabb er\u0151forr\u00e1s-nyilv\u00e1ntart\u00e1s elm\u00e9letileg nagyobb CPU-terhel\u00e9st kellene, hogy okozzon, de a gyakorlatban a k\u00fcl\u00f6nbs\u00e9gek l\u00e9nyegtelennek bizonyultak. K\u00fcl\u00f6n\u00f6sen az \u00faj slab vez\u00e9rl\u0151t m\u00e1r t\u00f6bb h\u00f3napja haszn\u00e1lj\u00e1k a Facebook munkaszerverein, amelyek k\u00fcl\u00f6nb\u00f6z\u0151 terhel\u00e9seket kezelnek, \u00e9s jelent\u0151s regresszi\u00f3kat eddig nem tapasztaltak. Ezzel szemben jelent\u0151s mem\u00f3riafogyaszt\u00e1s-cs\u00f6kken\u00e9s figyelhet\u0151 meg - n\u00e9h\u00e1ny hosztn\u00e1l ak\u00e1r 1 GB mem\u00f3ri\u00e1t is siker\u00fclt megtakar\u00edtani, de ez a mutat\u00f3 er\u0151sen f\u00fcgg a terhel\u00e9s jelleg\u00e9t\u0151l, a RAM \u00f6sszeg\u00e9t\u0151l, a CPU sz\u00e1m\u00e1t\u00f3l \u00e9s a mem\u00f3riahaszn\u00e1lat jellemz\u0151it\u0151l. Az el\u0151zetes tesztek kimutatt\u00e1k<\/a><\/noindex> a mem\u00f3riafogyaszt\u00e1s cs\u00f6kkent\u00e9se 650-700 MB (42% a slab mem\u00f3ria \u00f6sszef\u00fcgg\u00e9s\u00e9ben) a web frontendn\u00e9l, 750-800 MB (35%) az adatb\u00e1zis cache szerver\u00e9n, \u00e9s 700 MB (36%) a DNS szerveren.<\/p>\n

<\/a><\/noindex><\/p>\n

Forr\u00e1s: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0420\u043e\u043c\u0430\u043d \u0413\u0443\u0449\u0438\u043d (Roman Gushchin) \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Facebook \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0432 \u0441\u043f\u0438\u0441\u043a\u0435 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u044f\u0434\u0440\u0430 Linux \u043d\u0430\u0431\u043e\u0440 \u043f\u0430\u0442\u0447\u0435\u0439 \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0435\u0439 \u043d\u043e\u0432\u043e\u0433\u043e \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440\u0430 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438 slab (slab memory controller). \u041d\u043e\u0432\u044b\u0439 \u043a\u043e\u043d\u0442\u0440\u043e\u043b\u043b\u0435\u0440 \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u043f\u0435\u0440\u0435\u043d\u043e\u0441\u043e\u043c \u0443\u0447\u0451\u0442\u0430 slab \u0441 \u0443\u0440\u043e\u0432\u043d\u044f \u0441\u0442\u0440\u0430\u043d\u0438\u0446 \u043f\u0430\u043c\u044f\u0442\u0438 \u043d\u0430 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u043e\u0431\u044a\u0435\u043a\u0442\u043e\u0432 \u044f\u0434\u0440\u0430, \u0447\u0442\u043e \u0434\u0430\u0451\u0442 \u0432\u043e\u0437\u043c\u043e\u0436\u043d\u043e\u0441\u0442\u044c \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u043d\u043e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u044c slab-\u0441\u0442\u0440\u0430\u043d\u0438\u0446\u044b \u0432 \u0440\u0430\u0437\u043d\u044b\u0445 cgroup, \u0432\u043c\u0435\u0441\u0442\u043e \u0432\u044b\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043e\u0442\u0434\u0435\u043b\u044c\u043d\u044b\u0445 \u043a\u044d\u0448\u0435\u0439 slab \u0434\u043b\u044f […]<\/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-79056","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Facebook \u00faj slab mem\u00f3ria vez\u00e9rl\u00e9si mechanizmust aj\u00e1nl a Linux kernel sz\u00e1m\u00e1ra | ProHoster","description":"Roman Gushchin (Roman Gushchin) a Facebook 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