{"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\/pl\/blog\/news\/misrosoft-otkryl-kod-sistemy-raspredeleniya-pamyati-mimalloc","title":{"rendered":"Mi\u0441rosoft otworzy\u0142 kod systemu zarz\u0105dzania pami\u0119ci\u0105 mimalloc","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Firma Microsoft otworzy\u0142a na licencji MIT bibliotek\u0119 <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/microsoft\/mimalloc\">mimalloc<\/a><\/noindex> z realizacj\u0105 systemu dystrybucji pami\u0119ci, pierwotnie stworzonego dla komponent\u00f3w uruchomieniowych j\u0119zyk\u00f3w <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/koka-lang\/koka\">Koka<\/a><\/noindex> i <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/leanprover\/lean\">Lean<\/a><\/noindex>. Mimalloc jest dostosowany do u\u017cycia w standardowych aplikacjach bez zmiany ich kodu i mo\u017ce pe\u0142ni\u0107 rol\u0119 przezroczystego zamiennika funkcji malloc. Obs\u0142ugiwane s\u0105 systemy Windows, macOS, Linux, BSD oraz inne systemy podobne do Uniksa.<\/p>\n<p>Kluczow\u0105 cech\u0105 mimalloc jest kompaktowo\u015b\u0107 implementacji (mniej ni\u017c 3500 wierszy kodu) oraz bardzo wysoka wydajno\u015b\u0107. W <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/microsoft\/mimalloc#performance\">przeprowadzonych testach<\/a><\/noindex> mimalloc przewy\u017cszy\u0142 pod wzgl\u0119dem wydajno\u015bci wszystkie konkurencyjne biblioteki dystrybucji pami\u0119ci, w tym <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/jemalloc\/jemalloc\">jemalloc<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/gperftools\/gperftools\">tcmalloc<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/microsoft\/snmalloc\">snmalloc<\/a><\/noindex>, <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/rampantpixels\/rpmalloc\">rpmalloc<\/a><\/noindex> i <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/emeryberger\/Hoard\">Hoard<\/a><\/noindex>. <\/p>\n<p>Do oceny wydajno\u015bci u\u017cyto zestawu ju\u017c istniej\u0105cych  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/daanx\/mimalloc-bench\">standardowych test\u00f3w<\/a><\/noindex> W niekt\u00f3rych testach mimalloc wyprzedza inne systemy wielokrotnie, na przyk\u0142ad w te\u015bcie migracji obiekt\u00f3w mi\u0119dzy r\u00f3\u017cnymi w\u0105tkami mimalloc okaza\u0142 si\u0119 szybszy ni\u017c tcmalloc i jemalloc ponad 2.5 razy. W tym samym czasie w wi\u0119kszo\u015bci test\u00f3w zaobserwowano r\u00f3wnie\u017c ni\u017csze zu\u017cycie pami\u0119ci, a w niekt\u00f3rych sytuacjach uda\u0142o si\u0119 zmniejszy\u0107 zu\u017cycie pami\u0119ci o 25%.<\/p>\n<p><center><img decoding=\"async\" alt=\"Mi\u0441rosoft otworzy\u0142 kod systemu zarz\u0105dzania pami\u0119ci\u0105 mimalloc\" src=\"\/wp-content\/uploads\/05811d717a243138d2bc926697657fa1.png\" style=\"display:block;margin: 0 auto;\" \/><\/center><\/p>\n<p>Wysoka wydajno\u015b\u0107 osi\u0105gana jest g\u0142\u00f3wnie dzi\u0119ki zastosowaniu segmentacji listy wolnych blok\u00f3w (free list sharding). Zamiast jednej du\u017cej listy, mimalloc stosuje podzia\u0142 na szereg mniejszych list, z kt\u00f3rych ka\u017cda jest powi\u0105zana ze stron\u0105 pami\u0119ci. Takie podej\u015bcie zmniejsza fragmentacj\u0119 i zwi\u0119ksza lokalizacj\u0119 danych w pami\u0119ci. Pod stron\u0105 pami\u0119ci rozumie si\u0119 zgrupowany zestaw blok\u00f3w o podobnym rozmiarze. W systemach 64-bitowych rozmiar strony zazwyczaj wynosi 64 KB. W przypadku, gdy na stronie nie pozostaj\u0105 zaj\u0119te bloki, jest ona ca\u0142kowicie zwalniana z powrotem do systemu operacyjnego, co pozwala na zmniejszenie wydatk\u00f3w na pami\u0119\u0107 i fragmentacji w d\u0142ugoterminowych programach.<\/p>\n<p>Bibliotek\u0119 mo\u017cna pod\u0142\u0105czy\u0107 na etapie linkowania lub za\u0142adowa\u0107 do ju\u017c zbudowanego programu (LD_PRELOAD=\/usr\/bin\/libmimalloc.so myprogram). W bibliotece oferowane s\u0105 r\u00f3wnie\u017c <noindex><a rel=\"nofollow\" href=\"https:\/\/microsoft.github.io\/mimalloc\/group__extended.html\">API<\/a><\/noindex> mo\u017cliwo\u015bci integracji funkcjonalno\u015bci w czasie wykonywania oraz precyzyjnego zarz\u0105dzania zachowaniem, na przyk\u0142ad do pod\u0142\u0105czenia obs\u0142ugi op\u00f3\u017anionego zwalniania pami\u0119ci i monotonnego zwi\u0119kszania licznik\u00f3w odniesie\u0144. Istnieje mo\u017cliwo\u015b\u0107 tworzenia i u\u017cywania w aplikacji wielu 'stos\u00f3w' (heap) do rozdzielania w r\u00f3\u017cnych obszarach pami\u0119ci. Mo\u017cliwe jest r\u00f3wnie\u017c zwalnianie ca\u0142ego stosu, bez przeszukiwania i osobnego zwalniania umieszczonych w nim obiekt\u00f3w.<\/p>\n<p>Przewidziana jest mo\u017cliwo\u015b\u0107 kompilacji biblioteki w trybie bezpiecznym, w kt\u00f3rym na granicach blok\u00f3w nast\u0119puje wstawienie specjalnych stron kontrolnych pami\u0119ci (guard-page), a tak\u017ce stosowana jest randomizacja alokacji blok\u00f3w i szyfrowanie list zwalnianych blok\u00f3w. Takie \u015brodki blokuj\u0105 wi\u0119kszo\u015b\u0107 standardowych technik wykorzystania przepe\u0142nie\u0144 bufer\u00f3w w stercie. Przy w\u0142\u0105czeniu trybu bezpiecznego wydajno\u015b\u0107 spada o oko\u0142o 3%.<\/p>\n<p>Z cech mimalloc nale\u017cy r\u00f3wnie\u017c zauwa\u017cy\u0107, \u017ce nie podlega problemom z rozrostem przy du\u017cej fragmentacji. W najgorszym scenariuszu zu\u017cycie pami\u0119ci wzrasta o 0,2% dla metadanych i mo\u017ce osi\u0105gn\u0105\u0107 16,7% dla alokowanej pami\u0119ci. Aby wykluczy\u0107 konflikty przy dost\u0119pie do zasob\u00f3w, w mimalloc stosowane s\u0105 wy\u0142\u0105cznie operacje atomowe.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>\u0179r\u00f3d\u0142o: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=50939\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\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 [&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-35585","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.1.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\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 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