{"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\/da\/blog\/news\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","title":{"rendered":"Til Linux-kernen udvikles et distribueret tr\u00e5dudf\u00f8relsessystem kaldet Popcorn","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Virginia Polytechnic Institute and State University et h\u00e5ndskrevet patch til rettelsen.<\/a><\/noindex> til diskussion blandt udviklerne af Linux-kernen om et s\u00e6t patches til implementering af et distribueret tr\u00e5dudf\u00f8relsessystem Popcorn<\/a><\/noindex> (Distribueret Tr\u00e5dudf\u00f8relse), der g\u00f8r det muligt at organisere udf\u00f8relsen af applikationer p\u00e5 flere computere med fordeling og gennemsigtig migration af tr\u00e5de mellem v\u00e6rter. Ved hj\u00e6lp af Popcorn kan applikationer startes p\u00e5 en v\u00e6rt og derefter flyttes til en anden v\u00e6rt uden at stoppe arbejdet. I flertr\u00e5dede programmer tillades migration af individuelle tr\u00e5de til andre v\u00e6rter. <\/p>\n

I mods\u00e6tning til projektet CRIU<\/a><\/noindex>, der g\u00f8r det muligt at gemme en proces' tilstand og genoptage udf\u00f8relsen p\u00e5 et andet system, tilbyder Popcorn s\u00f8ml\u00f8s og dynamisk migration mellem v\u00e6rter under udf\u00f8relsen af applikationen, uden at brugeren skal g\u00f8re noget, og sikrer konsistensen af den virtuelle hukommelse p\u00e5 alle v\u00e6rter, hvor tr\u00e5de samtidig udf\u00f8res. <\/p>\n

Popcorn-softwarestakken best\u00e5r af patches<\/a><\/noindex> til Linux-kernen og biblioteket<\/a><\/noindex> med tests, der demonstrerer, hvordan man kan bruge Popcorn's systemopkald til at migrere tr\u00e5de i distribueret udf\u00f8rte applikationer. Niveauet for kernen tilbyder udvidelser til den virtuelle hukommelsesundersystem med implementering af delt distribueret hukommelse (distributed shared memory), hvilket g\u00f8r det muligt for processer p\u00e5 forskellige v\u00e6rter at f\u00e5 adgang til et f\u00e6lles og konsistent virtuelt adressrum. Konsistensen af siderne i den virtuelle hukommelse sikres ved hj\u00e6lp af en protokol, der replikerer sider i hukommelsen p\u00e5 v\u00e6rten, n\u00e5r de tilg\u00e5s til l\u00e6sning, og invaliderer sider i hukommelsen, n\u00e5r der udf\u00f8res skrivning. <\/p>\n

Interaktionen mellem v\u00e6rter udf\u00f8res ved hj\u00e6lp af en kernel-niveau meddelelsesh\u00e5ndterer, der sender via TCP-socket. Det bem\u00e6rkes, at TCP\/IP anvendes for at forenkle fejls\u00f8gning og testning under udviklingsprocessen. Udviklere forst\u00e5r, at set fra et sikkerheds- og pr\u00e6stationsperspektiv er TCP\/IP ikke den bedste metode til at overf\u00f8re indholdet af kerne- og hukommelsessider mellem v\u00e6rter. Alle v\u00e6rter, der k\u00f8rer distribuerede applikationer, skal have identisk tillidsniveau. N\u00e5r de grundl\u00e6ggende algoritmer er stabiliseret, vil der blive anvendt en mere effektiv transportform.<\/p>\n

Popcorn har udviklet sig siden 2014 som et forskningsprojekt til at studere muligheden for at skabe distribuerede applikationer, hvis str\u00f8mme kan udf\u00f8res p\u00e5 forskellige noder i heterogene<\/a><\/noindex> computersystemer, hvor kerner baseret p\u00e5 forskellige instruktionss\u00e6tarkitekturer (Xeon\/Xeon-Phi, ARM\/x86, CPU\/GPU\/FPGA) kan kombineres. Den foresl\u00e5ede s\u00e6t af patches til Linux-kernen underst\u00f8tter kun udf\u00f8relse p\u00e5 v\u00e6rter med CPU x86, men der findes en mere funktionel variant af Popcorn Linux, der g\u00f8r det muligt at k\u00f8re applikationer p\u00e5 v\u00e6rter med forskellige CPU-arkitekturer (x86 og ARM). For at bruge Popcorn i heterogene milj\u00f8er er det n\u00f8dvendigt at anvende en speciel kompilator<\/a><\/noindex> baseret p\u00e5 LLVM. Ved distribueret udf\u00f8relse p\u00e5 v\u00e6rter med samme arkitektur kr\u00e6ves der ikke en genopbygning med en separat kompilator.<\/p>\n

\"Til<\/a><\/noindex><\/center><\/p>\n

Derudover kan det n\u00e6vnes, annoncering<\/a><\/noindex> af et lignende projekt Telefork<\/a><\/noindex> med implementeringen af en grundprototype API til at starte underprocesser p\u00e5 andre computere i klyngen (som fork(), men flytter den afstikkende proces til en anden computer).
\n Koden er skrevet i Rust og tillader indtil videre kun kloning af de enkleste processer, hvor der ikke anvendes systemressourcer som filer. Ved kaldet til telefork klones hukommelsen og de relaterede processtrukturer til en anden v\u00e6rt, hvor serverh\u00e5ndtereren (telepad) k\u00f8rer. Ved hj\u00e6lp af ptrace serialiseres processen hukommelse og overf\u00f8res sammen med processtatus og registre til en anden v\u00e6rt. API'et tillader ogs\u00e5 at gemme processtatus i en fil og gendanne den derfra.<\/p>\n

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

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

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