{"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\/sv\/blog\/news\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","title":{"rendered":"F\u00f6r k\u00e4rnan av Linux utvecklas ett distribuerat system f\u00f6r tr\u00e5dk\u00f6rning, Popcorn","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Virginia Polytechnic Institute f\u00f6reslog<\/a><\/noindex> f\u00f6r diskussion bland Linux-kernutvecklare om en upps\u00e4ttning patchar f\u00f6r implementering av ett distribuerat tr\u00e5d-utf\u00f6rande system Popcorn<\/a><\/noindex> (Distributed Thread Execution), vilket m\u00f6jligg\u00f6r k\u00f6rning av applikationer p\u00e5 flera datorer med distribuerad och transparent migrering av tr\u00e5dar mellan v\u00e4rdar. Med Popcorn kan applikationer startas p\u00e5 en v\u00e4rd och sedan flyttas till en annan v\u00e4rd utan att stoppa driften. I flertr\u00e5diga program till\u00e5ts migrering av enskilda tr\u00e5dar till andra v\u00e4rdar. <\/p>\n

Till skillnad fr\u00e5n projektet CRIU<\/a><\/noindex>, som m\u00f6jligg\u00f6r att spara tillst\u00e5ndet f\u00f6r en process och \u00e5teruppta k\u00f6rningen p\u00e5 ett annat system, erbjuder Popcorn s\u00f6ml\u00f6s och dynamisk migrering mellan v\u00e4rdar under applikationens k\u00f6rning, utan att anv\u00e4ndaren beh\u00f6ver g\u00f6ra n\u00e5got och s\u00e4kerst\u00e4ller konsekvensen av det virtuella minnet p\u00e5 alla v\u00e4rdar d\u00e4r tr\u00e5dar k\u00f6rs simultant. <\/p>\n

Popcorn-programvarustacken best\u00e5r av patchar<\/a><\/noindex> till Linux-k\u00e4rnan och biblioteket<\/a><\/noindex> med tester som demonstrerar hur man kan anv\u00e4nda systemanrop fr\u00e5n Popcorn f\u00f6r att migrera tr\u00e5dar i distribuerade applikationer. P\u00e5 k\u00e4rnniv\u00e5 f\u00f6resl\u00e5s utvidgningar till det virtuella minnessubsystemet med implementering av distribuerat delat minne, vilket g\u00f6r det m\u00f6jligt f\u00f6r processer p\u00e5 olika v\u00e4rdar att komma \u00e5t ett gemensamt och konsekvent virtuellt adressutrymme. Konsistensen av sidor i det virtuella minnet s\u00e4kerst\u00e4lls genom en protokoll som replikera sidor av minnet p\u00e5 v\u00e4rden n\u00e4r de l\u00e4ses och ogiltigf\u00f6rklarar minnessidor vid skrivning. <\/p>\n

Interaktionen mellan v\u00e4rdarna sker genom en meddelandehanterare som arbetar p\u00e5 k\u00e4rnniv\u00e5, som skickar meddelanden via en TCP-socket. Det noteras att TCP\/IP anv\u00e4nds f\u00f6r att f\u00f6renkla fels\u00f6kning och testning under utvecklingsprocessen. Utvecklarna f\u00f6rst\u00e5r att ur s\u00e4kerhet och prestanda perspektiv \u00e4r TCP\/IP inte det b\u00e4sta s\u00e4ttet att \u00f6verf\u00f6ra inneh\u00e5llet fr\u00e5n k\u00e4rnstrukturer och minnessidor mellan v\u00e4rdar. Alla v\u00e4rdar d\u00e4r distribuerade applikationer k\u00f6rs m\u00e5ste ha samma niv\u00e5 av f\u00f6rtroende. N\u00e4r de grundl\u00e4ggande algoritmerna stabiliseras kommer en mer effektiv transportmetod att till\u00e4mpas.<\/p>\n

Popcorn har utvecklats sedan 2014 som ett forskningsprojekt f\u00f6r att unders\u00f6ka m\u00f6jligheterna att skapa distribuerade applikationer, vars tr\u00e5dar kan k\u00f6ras p\u00e5 olika noder i heterogena<\/a><\/noindex> ber\u00e4kningssystem d\u00e4r k\u00e4rnor baserade p\u00e5 olika arkitekturer av instruktioner kan kombineras (Xeon\/Xeon-Phi, ARM\/x86, CPU\/GPU\/FPGA). Den f\u00f6reslagna upps\u00e4ttningen patchar f\u00f6r Linux-k\u00e4rnans utvecklare st\u00f6djer endast k\u00f6rning p\u00e5 v\u00e4rdar med CPU x86, men det finns en mer funktionell variant, Popcorn Linux, som g\u00f6r det m\u00f6jligt att k\u00f6ra applikationer p\u00e5 v\u00e4rdar med olika CPU-arkitekturer (x86 och ARM). F\u00f6r att anv\u00e4nda Popcorn i heterogena milj\u00f6er kr\u00e4vs en specialiserad kompilator<\/a><\/noindex> baserad p\u00e5 LLVM. Vid distribuerad k\u00f6rning p\u00e5 v\u00e4rdar med samma arkitektur beh\u00f6vs ingen omkompilering med en separat kompilator.<\/p>\n

\"F\u00f6r<\/a><\/noindex><\/center><\/p>\n

Dessutom kan man n\u00e4mna annons<\/a><\/noindex> av ett liknande projekt Telefork<\/a><\/noindex> med en initial prototyp av ett API f\u00f6r att starta barnprocesser p\u00e5 andra datorer i klustret (som fork(), men flyttar den avknoppade processen till en annan dator).
\n Koden \u00e4r skriven i Rust och till\u00e5ter f\u00f6r n\u00e4rvarande bara kloning av de enklaste processerna som inte anv\u00e4nder systemresurser, s\u00e5som filer. Vid anrop av telefork klonas minnet och de processrelaterade strukturerna till en annan v\u00e4rd d\u00e4r serverhanteraren (telepad) k\u00f6rs. Genom ptrace serialiseras processens minne och \u00f6verf\u00f6rs tillsammans med processens tillst\u00e5nd och register till en annan v\u00e4rd. API:t m\u00f6jligg\u00f6r ocks\u00e5 att spara processens tillst\u00e5nd i en fil och \u00e5terst\u00e4lla det genom den.<\/p>\n

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

K\u00e4lla: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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