{"id":35585,"date":"2019-10-31T22:05:11","date_gmt":"2019-10-31T19:05:11","guid":{"rendered":"https:\/\/prohoster.info\/blog\/misrosoft-otkryl-kod-sistemy-raspredeleniya-pamyati-mimalloc\/"},"modified":"2019-10-31T22:05:11","modified_gmt":"2019-10-31T19:05:11","slug":"misrosoft-otkryl-kod-sistemy-raspredeleniya-pamyati-mimalloc","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/misrosoft-otkryl-kod-sistemy-raspredeleniya-pamyati-mimalloc","title":{"rendered":"Microsoft avas m\u00e4luhalduse s\u00fcsteemi mimalloc koodi","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Microsofti ettev\u00f5te avas MIT litsentsi alusel teegi mimalloc<\/a><\/noindex> m\u00e4luhalduse s\u00fcsteemi rakenduste jaoks, mis loodi algselt runtime-komponentide jaoks Koka<\/a><\/noindex> ja Lean<\/a><\/noindex>. Mimalloc on kohandatud kasutamiseks t\u00fc\u00fcpilistes rakendustes ilma nende koodi muutmata ning v\u00f5ib toimida l\u00e4bipaistva asendusena malloc-funktsioonile. Toetatakse t\u00f6\u00f6d Windowsis, macOSis, Linuxis, BSD-s ja muudes Unixitaolistel s\u00fcsteemidel.<\/p>\n

Mimalloci p\u00f5hijoon on rakenduse kompaktsus (alla 3500 koodi rida) ja v\u00e4ga k\u00f5rge j\u00f5udlus. Tehtud testides<\/a><\/noindex> mimalloc \u00fcletas j\u00f5udluselt k\u00f5ik konkurentsiv\u00f5imelised m\u00e4luhaldusteegid, sealhulgas jemalloc<\/a><\/noindex>, tcmalloc<\/a><\/noindex>, snmalloc<\/a><\/noindex>, rpmalloc<\/a><\/noindex> ja Hoard<\/a><\/noindex>. <\/p>\n

J\u00f5udluse hindamiseks kasutati juba olemasolevat t\u00fc\u00fcpiliste testide komplekti<\/a><\/noindex> M\u00f5nedes testides \u00fcletab mimalloc teisi s\u00fcsteeme mitu korda, n\u00e4iteks objekti migreerimise testides mitmesuguste l\u00f5imede vahel osutus mimalloc kiiremaks kui tcmalloc ja jemalloc rohkem kui 2,5 korda. Samuti on enamikus testides m\u00e4rgata madalamat m\u00e4lutarbimist, m\u00f5nes olukorras suudeti m\u00e4lu kasutust v\u00e4hendada 25%.<\/p>\n

\"Microsoft<\/center><\/p>\n

K\u00f5rge j\u00f5udlus saavutatakse peamiselt vabade blokkskeemide segmentimise (free list sharding) rakendamise kaudu. \u00dche suure loendi asemel rakendab mimalloc jagamise seeria v\u00e4iksemateks nimekirjadeks, millest iga\u00fchel on oma m\u00e4lu leht. Selline l\u00e4henemine v\u00e4hendab fragmenteeritust ja t\u00f5stab andmete lokaliseerimist m\u00e4lus. M\u00e4lu leht m\u00f5istetakse kui r\u00fchmitatud l\u00e4heduses asuvate plokkide kogumit. 64-bitistes s\u00fcsteemides on lehe suurus tavaliselt 64 KB. Kui lehe sees ei j\u00e4\u00e4 vabu blokke, vabastatakse see t\u00e4ielikult ja m\u00e4lu tagastatakse operatsioonis\u00fcsteemile, mis v\u00e4hendab m\u00e4lu kasutust ja fragmenteerimist pikaajalistes programmides.<\/p>\n

Raamatukogu saab liita sidumisfaasis v\u00f5i koormata juba koostatud programmi jaoks (\u00e2\u20ac\u017eLD_PRELOAD=\\\/usr\\\/bin\\\/libmimalloc.so myprogram\u00e2\u20ac\u0153). Raamatukogus on samuti pakutud API<\/a><\/noindex> funktsionaalsuse integreerimist jooksva ajal ja peene juhtimise k\u00e4itumise \u00fcle, n\u00e4iteks viivitamata m\u00e4lu vabastamise k\u00e4itlejate ja monotoosse viidete loendite suurendamise \u00fchendamiseks. Rakenduses on v\u00f5imalik luua ja kasutada mitut \u00e2\u20ac\u017ekimbu\u00e2\u20ac\u0153 (heap), et jaotada m\u00e4lu erinevatesse piirkondadesse. Samuti on v\u00f5imalik vabastada kogu kimbu, ilma et peaks eraldi objektide vabastamisega tegelema.<\/p>\n

On ette n\u00e4htud, et raamatukogu saab kokku panna ohutusalustes re\u017eiimides, kus plokkide piiril asetatakse spetsiaalsed m\u00e4lukontrolli lehed (guard-page) ning kasutatakse plokkide jaotuse randomiseerimist ja vabastamiste loendite kr\u00fcpteerimist. Sellised meetmed aitavad blokeerida enamikku t\u00fc\u00fcpilistest m\u00e4lu \u00fclevoolu ekspluatatsioonitehnikatest. Ohutusaluse re\u017eiimi aktiveerimisel v\u00e4heneb tootlikkus ligikaudu 3%.<\/p>\n

Mimalloci erip\u00e4ra hulka kuulub ka resistentsus puhverdamise probleemide vastu suurte killustumiste korral. Halvimal juhul t\u00f5useb m\u00e4lu tarbimine 0,2% ulatuses metaandmete ja v\u00f5ib ulatuda 16,7% jaotatud m\u00e4lu jaoks. Ressursside ligip\u00e4\u00e4su konfliktide v\u00e4ltimiseks kasutatakse mimallocis ainult aatomseid toiminguid.<\/p>\n

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

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

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Mi\u0441rosoft \u043e\u0442\u043a\u0440\u044b\u043b\u0430 \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 MIT \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0443 mimalloc \u0441 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u044f \u043f\u0430\u043c\u044f\u0442\u0438, \u0438\u0437\u043d\u0430\u0447\u0430\u043b\u044c\u043d\u043e \u0441\u043e\u0437\u0434\u0430\u043d\u043d\u043e\u0439 \u0434\u043b\u044f runtime-\u043a\u043e\u043c\u043f\u043e\u043d\u0435\u043d\u0442\u043e\u0432 \u044f\u0437\u044b\u043a\u043e\u0432 Koka \u0438 Lean. Mimalloc \u0430\u0434\u0430\u043f\u0442\u0438\u0440\u043e\u0432\u0430\u043d \u0434\u043b\u044f \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f \u0432 \u0442\u0438\u043f\u043e\u0432\u044b\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f\u0445 \u0431\u0435\u0437 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0438\u0445 \u043a\u043e\u0434\u0430 \u0438 \u043c\u043e\u0436\u0435\u0442 \u0432\u044b\u0441\u0442\u0443\u043f\u0430\u0442\u044c \u0432 \u043a\u0430\u0447\u0435\u0441\u0442\u0432\u0435 \u043f\u0440\u043e\u0437\u0440\u0430\u0447\u043d\u043e\u0439 \u0437\u0430\u043c\u0435\u043d\u044b \u0444\u0443\u043d\u043a\u0446\u0438\u0438 malloc. \u041f\u043e\u0434\u0434\u0435\u0440\u0436\u0438\u0432\u0430\u0435\u0442\u0441\u044f \u0440\u0430\u0431\u043e\u0442\u0430 \u0432 Windows, macOS, Linux, BSD \u0438 \u0434\u0440\u0443\u0433\u0438\u0445 Unix-\u043f\u043e\u0434\u043e\u0431\u043d\u044b\u0445 \u0441\u0438\u0441\u0442\u0435\u043c\u0430\u0445. \u041a\u043b\u044e\u0447\u0435\u0432\u043e\u0439 \u043e\u0441\u043e\u0431\u0435\u043d\u043d\u043e\u0441\u0442\u044c\u044e mimalloc […]<\/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-35585","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\udd47Microsoft avas m\u00e4lu jaotamise s\u00fcsteemi mimalloci koodi | ProHoster","description":"Ettev\u00f5te Microsoft avas MIT litsentsi all raamatukogu mimalloc, mis sisaldab m\u00e4lu jaotamise s\u00fcsteemi rakendust, mis on esialgu 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