{"id":80342,"date":"2020-05-05T07:42:07","date_gmt":"2020-05-05T05:42:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn"},"modified":"2020-05-05T07:42:07","modified_gmt":"2020-05-05T05:42:07","slug":"dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","status":"publish","type":"post","link":"https:\/\/prohoster.info\/pl\/blog\/news\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","title":{"rendered":"Dla j\u0105dra Linux rozwijany jest system rozproszonego wykonywania w\u0105tk\u00f3w Popcorn","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Politechnika Wirginijska <noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2020\/4\/29\/1111\">zaproponowa\u0142<\/a><\/noindex> do om\u00f3wienia zestaw \u0142atek od deweloper\u00f3w j\u0105dra Linux zawieraj\u0105cych implementacj\u0119 systemu rozproszonego wykonywania w\u0105tk\u00f3w <noindex><a rel=\"nofollow\" href=\"http:\/\/popcornlinux.org\">Popcorn<\/a><\/noindex> (Distributed Thread Execution), kt\u00f3ry umo\u017cliwia organizacj\u0119 wykonywania aplikacji na wielu komputerach z rozdzieleniem i przezroczyst\u0105 migracj\u0105 w\u0105tk\u00f3w mi\u0119dzy hostami. Dzi\u0119ki Popcorn aplikacje mog\u0105 by\u0107 uruchamiane na jednym ho\u015bcie, a nast\u0119pnie bez zatrzymywania pracy przenoszone na inny host. W programach wielow\u0105tkowych dopuszcza si\u0119 migracj\u0119 na inne hosty poszczeg\u00f3lnych w\u0105tk\u00f3w. <\/p>\n<p>W odr\u00f3\u017cnieniu od projektu <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=44015\">CRIU<\/a><\/noindex>, kt\u00f3ry pozwala na zapisywanie stanu procesu i wznawianie wykonania na innym systemie, Popcorn zapewnia p\u0142ynne i dynamiczne migracje mi\u0119dzy hostami w trakcie wykonania aplikacji, nie wymagaj\u0105c dzia\u0142a\u0144 od u\u017cytkownika i zapewniaj\u0105c sp\u00f3jno\u015b\u0107 pami\u0119ci wirtualnej na wszystkich hostach, na kt\u00f3rych jednocze\u015bnie wykonywane s\u0105 w\u0105tki. <\/p>\n<p>Stos oprogramowania Popcorn sk\u0142ada si\u0119 z <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ssrg-vt\/popcorn-kernel\">\u0142atek<\/a><\/noindex> do j\u0105dra Linux oraz <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ssrg-vt\/popcorn-kernel-lib\">biblioteki<\/a><\/noindex> z testami, kt\u00f3re demonstruj\u0105, jak mo\u017cna u\u017cywa\u0107 wywo\u0142a\u0144 systemowych Popcorn do migracji w\u0105tk\u00f3w w rozproszenie wykonywanych aplikacjach. Na poziomie j\u0105dra zaproponowane zosta\u0142y rozszerzenia do podsystemu pami\u0119ci wirtualnej z implementacj\u0105 rozdzielonej pami\u0119ci (distributed shared memory), kt\u00f3ra umo\u017cliwia procesom na r\u00f3\u017cnych hostach dost\u0119p do wsp\u00f3lnej i sp\u00f3jnej przestrzeni adresowej. Sp\u00f3jno\u015b\u0107 stron pami\u0119ci wirtualnej zapewniana jest dzi\u0119ki protoko\u0142owi, kt\u00f3ry replikuje na ho\u015bcie strony pami\u0119ci przy ich odczycie i uniewa\u017cnia strony pami\u0119ci przy zapisach. <\/p>\n<p>Interakcja mi\u0119dzy hostami odbywa si\u0119 za pomoc\u0105 dzia\u0142aj\u0105cego na poziomie j\u0105dra mechanizmu obs\u0142ugi wiadomo\u015bci, przesy\u0142anych przez gniazdo TCP. Zauwa\u017ca si\u0119, \u017ce TCP\/IP jest wykorzystywane w celu uproszczenia debugowania i testowania w trakcie rozwoju. Deweloperzy rozumiej\u0105, \u017ce z punktu widzenia bezpiecze\u0144stwa i wydajno\u015bci TCP\/IP nie jest najlepszym sposobem przesy\u0142ania zawarto\u015bci struktur j\u0105dra i stron pami\u0119ci mi\u0119dzy hostami. Wszystkie hosty, na kt\u00f3rych wykonywane s\u0105 rozproszone aplikacje, musz\u0105 mie\u0107 identyczny poziom zaufania. Po stabilizacji podstawowych algorytm\u00f3w zostanie zastosowany bardziej wydajny spos\u00f3b transportu.<\/p>\n<p>Popcorn rozwija si\u0119 od 2014 roku jako projekt badawczy maj\u0105cy na celu zbadanie mo\u017cliwo\u015bci tworzenia rozproszonych aplikacji, kt\u00f3rych w\u0105tki mog\u0105 by\u0107 wykonywane na r\u00f3\u017cnych w\u0119z\u0142ach w <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%93%D0%B5%D1%82%D0%B5%D1%80%D0%BE%D0%B3%D0%B5%D0%BD%D0%BD%D1%8B%D0%B5_%D0%B2%D1%8B%D1%87%D0%B8%D1%81%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F\">heterogenicznych<\/a><\/noindex> systemach obliczeniowych, w kt\u00f3rych mog\u0105 by\u0107 \u0142\u0105czone rdzenie oparte na r\u00f3\u017cnych architekturach zestawu instrukcji (Xeon\/Xeon-Phi, ARM\/x86, CPU\/GPU\/FPGA). Proponowany deweloperom rdze\u0144 Linux zbi\u00f3r poprawek wspiera jedynie wykonanie na hostach z CPU x86, ale dost\u0119pna jest tak\u017ce bardziej funkcjonalna wersja Popcorn Linux, kt\u00f3ra umo\u017cliwia wykonywanie aplikacji na hostach z r\u00f3\u017cnymi architekturami CPU (x86 i ARM). Aby korzysta\u0107 z Popcorn w heterogenicznych \u015brodowiskach, nale\u017cy wykorzysta\u0107 specjalny <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/ssrg-vt\/popcorn-compiler\">kompilator<\/a><\/noindex> oparty na LLVM. Przy rozproszonym wykonaniu na hostach z jedn\u0105 architektur\u0105 ponowna kompilacja odr\u0119bnym kompilatorem nie jest wymagana.<\/p>\n<p><center><noindex><a rel=\"nofollow\" href=\"http:\/\/popcornlinux.org\/images\/images\/popcorn-software-stack.png\"><img decoding=\"async\" alt=\"Dla j\u0105dra Linux rozwijany jest system rozproszonego wykonywania w\u0105tk\u00f3w Popcorn\" src=\"\/wp-content\/uploads\/2020\/05\/8b14f310d4769cb5e52cbda8f56ef1c0.jpg\" style=\"display:block;margin: 0 auto;\" \/><\/a><\/noindex><\/center><\/p>\n<p>Ponadto mo\u017cna zauwa\u017cy\u0107 <noindex><a rel=\"nofollow\" href=\"https:\/\/thume.ca\/2020\/04\/18\/telefork-forking-a-process-onto-a-different-computer\/\">zapowied\u017a<\/a><\/noindex> czego\u015b podobnego projektu  <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/trishume\/telefork\">Telefork<\/a><\/noindex> z realizacj\u0105 wst\u0119pnego prototypu API do uruchamiania proces\u00f3w podrz\u0119dnych na innych komputerach w klastrze (jak fork(), ale przenosi odbiegaj\u0105cy proces na inny komputer).<br \/>\n Kod jest napisany w j\u0119zyku Rust i obecnie umo\u017cliwia klonowanie tylko najprostszych proces\u00f3w, w kt\u00f3rych nie s\u0105 u\u017cywane zasoby systemowe, takie jak pliki. Podczas wywo\u0142ania telefork pami\u0119\u0107 i powi\u0105zane z procesem struktury s\u0105 klonowane na inny host, na kt\u00f3rym dzia\u0142a serwerowy procesor (telepad). Przy pomocy ptrace odzwierciedlenie pami\u0119ci procesu jest serializowane i razem z stanem procesu oraz rejestrami przenoszone na inny host. API umo\u017cliwia r\u00f3wnie\u017c zapisywanie stanu procesu do pliku i przywracanie przez ten plik.<\/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=52877\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041f\u043e\u043b\u0438\u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442 \u0412\u0438\u0440\u0433\u0438\u043d\u0438\u0438 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u043e\u0431\u0441\u0443\u0436\u0434\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430\u043c\u0438 \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 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0451\u043d\u043d\u043e\u0433\u043e \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u044f \u043f\u043e\u0442\u043e\u043a\u043e\u0432 Popcorn (Distributed Thread Execution), \u043f\u043e\u0437\u0432\u043e\u043b\u044f\u044e\u0449\u0435\u0439 \u043e\u0440\u0433\u0430\u043d\u0438\u0437\u043e\u0432\u0430\u0442\u044c \u0432\u044b\u043f\u043e\u043b\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u043d\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u0438\u0445 \u043a\u043e\u043c\u043f\u044c\u044e\u0442\u0435\u0440\u0430\u0445 \u0441 \u0440\u0430\u0441\u043f\u0440\u0435\u0434\u0435\u043b\u0435\u043d\u0438\u0435\u043c \u0438 \u043f\u0440\u043e\u0437\u0440\u0430\u0447\u043d\u043e\u0439 \u043c\u0438\u0433\u0440\u0430\u0446\u0438\u0435\u0439 \u043f\u043e\u0442\u043e\u043a\u043e\u0432 \u043c\u0435\u0436\u0434\u0443 \u0445\u043e\u0441\u0442\u0430\u043c\u0438. \u041f\u0440\u0438 \u043f\u043e\u043c\u043e\u0449\u0438 Popcorn \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u043c\u043e\u0433\u0443\u0442 \u0431\u044b\u0442\u044c \u0437\u0430\u043f\u0443\u0449\u0435\u043d\u044b \u043d\u0430 \u043e\u0434\u043d\u043e\u043c \u0445\u043e\u0441\u0442\u0435, \u043f\u043e\u0441\u043b\u0435 \u0447\u0435\u0433\u043e \u0431\u0435\u0437 \u043e\u0441\u0442\u0430\u043d\u043e\u0432\u043a\u0438 \u0440\u0430\u0431\u043e\u0442\u044b \u043f\u0435\u0440\u0435\u043c\u0435\u0449\u0435\u043d\u044b \u043d\u0430 \u0434\u0440\u0443\u0433\u043e\u0439 \u0445\u043e\u0441\u0442. [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":80343,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-80342","post","type-post","status-publish","format-standard","has-post-thumbnail","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=\"\u041f\u043e\u043b\u0438\u0442\u0435\u0445\u043d\u0438\u0447\u0435\u0441\u043a\u0438\u0439 \u0443\u043d\u0438\u0432\u0435\u0440\u0441\u0438\u0442\u0435\u0442 \u0412\u0438\u0440\u0433\u0438\u043d\u0438\u0438 \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b \u0434\u043b\u044f \u043e\u0431\u0441\u0443\u0436\u0434\u0435\u043d\u0438\u044f \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430\u043c\u0438 \u044f\u0434\u0440\u0430 Linux 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