{"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\/ro\/blog\/news\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","title":{"rendered":"Facebook a propus un nou mecanism de gestionare a memoriei slab pentru kernelul Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Roman Gushchin (Roman Gushchin<\/a><\/noindex>) de la compania Facebook a publicat<\/a><\/noindex> \u00een lista de distribu\u021bie a dezvoltatorilor nucleului Linux, un set de patch-uri pentru implementarea unui nou controler de distribu\u021bie a memoriei slab<\/a><\/noindex> (controler de memorie slab). Noua solu\u021bie se remarc\u0103 prin transferul contabiliz\u0103rii slab de la nivelul paginilor de memorie la nivelul obiectelor nucleului, ceea ce permite partajarea paginilor slab \u00eentre diferite cgroup-uri, \u00een locul aloc\u0103rii unor cache-uri slab separate pentru fiecare cgroup. <\/p>\n

Abordarea propus\u0103 permite cre\u0219terea eficien\u021bei utiliz\u0103rii slab, reduc\u00e2nd cu 30-45% dimensiunea memoriei utilizate pentru slab \u0219i diminu\u00e2nd semnificativ consumul general de memorie al nucleului. Prin reducerea num\u0103rului de slab-uri nealocate, se observ\u0103 de asemenea un efect pozitiv \u00een domeniul reducerii fragment\u0103rii memoriei. Noul controler de memorie simplific\u0103 semnificativ codul pentru contabilizarea slab \u0219i nu necesit\u0103 aplicarea unor algoritmi complexe pentru crearea \u0219i \u0219tergerea dinamic\u0103 a cache-urilor slab pentru fiecare cgroup. Toate cgroup-urile pentru memorie din aceast\u0103 implementare utilizeaz\u0103 un set comun de cache-uri slab, iar timpul de via\u021b\u0103 al cache-urilor slab nu mai este legat de durata de via\u021b\u0103 stabilit\u0103 prin cgroup limit\u0103ri<\/a><\/noindex> pentru utilizarea memoriei.<\/p>\n

Noul controller slab implementat ofer\u0103 o contabilitate mai precis\u0103 a resurselor, ceea ce teoretic ar trebui s\u0103 suprasolicite mai mult CPU-ul, dar \u00een practic\u0103 diferen\u021bele s-au dovedit a fi nesemnificative. \u00cen special, noul controller slab este utilizat de c\u00e2teva luni pe serverele opera\u021bionale ale Facebook, care gestioneaz\u0103 diverse tipuri de sarcini, iar regresii notabile nu au fost identificate p\u00e2n\u0103 acum. Totodat\u0103, se observ\u0103 o reducere semnificativ\u0103 a consumului de memorie \u2014 pe unele gazde s-a reu\u0219it economisirea de p\u00e2n\u0103 la 1GB de memorie, dar acest indicator depinde foarte mult de caracteristicile sarcinii, dimensiunea total\u0103 a RAM-ului, num\u0103rul de CPU \u0219i particularit\u0103\u021bile gestion\u0103rii memoriei. Testele anterioare efectuate s-a prezentat<\/a><\/noindex> au ar\u0103tat o reducere a consumului de memorie de 650-700 MB (42% din memoria slab) pe front-end-ul web, 750-800 MB (35%) pe serverul cu cache-ul SGBD \u0219i 700 MB (36%) pe serverul DNS.<\/p>\n

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

Sursa: opennet.ro<\/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\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 a propus un nou mecanism de gestionare a memoriei slab pentru nucleul Linux | ProHoster","description":"Roman Gushchin (Roman Gushchin) de la compania 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