{"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\/hr\/blog\/news\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","title":{"rendered":"Facebook je predlo\u017eio novi mehanizam upravljanja memorijom slab za kernel Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Roman Gushchin (Roman Gushchin<\/a><\/noindex>) iz tvrtke Facebook je objavio<\/a><\/noindex> na mailing listi programera jezgre Linuxa paket zakrpa s implementacijom novog kontrolera za raspodjelu memorije slab<\/a><\/noindex> (kontroler slab memorije). Novi kontroler isti\u010de se prijenosom pra\u0107enja slab s razine stranica memorije na razinu objekata jezgre, \u0161to omogu\u0107uje zajedni\u010dko kori\u0161tenje slab-stranica u razli\u010ditim cgroup, umjesto dodjeljivanja posebnih slab-cacheva za svaku cgroup. <\/p>\n

Predlo\u017eeni pristup omogu\u0107ava pove\u0107anje u\u010dinkovitosti kori\u0161tenja slab, smanjenje veli\u010dine kori\u0161tene memorije za slab za 30-45% i zna\u010dajno smanjenje ukupne potro\u0161nje memorije od strane jezgre. Zbog smanjenja broja nepreseljenih slab-ova tako\u0111er se vidi pozitivan u\u010dinak na smanjenje fragmentacije memorije. Novi kontroler memorije zna\u010dajno pojednostavljuje kod za pra\u0107enje slab i ne zahtijeva primjenu slo\u017eenih algoritama dinami\u010dkog stvaranja i uni\u0161tavanja slab-cacheva za svaku cgroup. Sve cgroup za memoriju u novoj implementaciji koriste zajedni\u010dki set slab-cacheva, a \u017eivotni vijek slab-cacheva vi\u0161e nije vezan uz \u017eivotni vijek postavljenih putem cgroup ograni\u010denja<\/a><\/noindex> u kori\u0161tenju memorije.<\/p>\n

Nova slab kontrola koja je implementirana omogu\u0107ava preciznije pra\u0107enje resursa, \u0161to bi teoretski trebalo vi\u0161e optere\u0107ivati CPU, ali su u praksi razlike bile neznatne. Konkretno, nova slab kontrola se ve\u0107 nekoliko mjeseci koristi na produkcijskim poslu\u017eiteljima Facebook-a koji obra\u0111uju razli\u010dite vrste optere\u0107enja, i zna\u010dajni regres su do sada neotkriveni. Istovremeno, primjetno je smanjenje potro\u0161nje memorije \u2014 na nekim hostovima je mogu\u0107e u\u0161tedjeti do 1GB memorije, ali taj rezultat uvelike ovisi o karakteru optere\u0107enja, ukupnoj koli\u010dini RAM-a, broju CPU-a i specifi\u010dnostima upravljanja memorijom. Prija\u0161nje provedene testove pokazali su<\/a><\/noindex> smanjenje potro\u0161nje memorije za 650-700 MB (42% slab memorije) na web frontendu, 750-800 MB (35%) na serveru s cacheom DBMS-a i 700 MB (36%) na DNS serveru.<\/p>\n

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

Izvor: 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 je predlo\u017eio novi mehanizam upravljanja memorijom slab za Linux kernel | ProHoster","description":"Roman Gushchin (Roman Gushchin) iz tvrtke 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