{"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\/ro\/blog\/news\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","title":{"rendered":"Pentru kernelul Linux se dezvolt\u0103 un sistem de execu\u021bie distribuit\u0103 a fluxurilor Popcorn","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Universitatea Politehnica din Virginia a propus<\/a><\/noindex> pentru discu\u021bii \u00eentre dezvoltatorii nucleului Linux despre un set de patch-uri pentru implementarea unui sistem de execu\u021bie distribuit\u0103 a firelor Popcorn<\/a><\/noindex> (Execu\u021bie Distribuit\u0103 a Firelor), care permite organizarea execu\u021biei aplica\u021biilor pe mai multe computere, cu distribuirea \u0219i migrarea transparent\u0103 a firelor \u00eentre gazde. Cu ajutorul Popcorn, aplica\u021biile pot fi lansate pe o gazd\u0103, apoi muta\u021bi f\u0103r\u0103 a opri func\u021bionarea pe o alt\u0103 gazd\u0103. \u00cen programele multi-frate, migrarea unor fire pe alte gazde este permis\u0103. <\/p>\n

Spre deosebire de proiectul CRIU<\/a><\/noindex>, care permite salvarea st\u0103rii unui proces \u0219i reluarea execu\u021biei pe un alt sistem, Popcorn ofer\u0103 migrare f\u0103r\u0103 \u00eentreruperi \u0219i dinamic\u0103 \u00eentre gazde \u00een timpul execu\u021biei aplica\u021biei, f\u0103r\u0103 a necesita ac\u021biuni din partea utilizatorului \u0219i garant\u00e2nd coeren\u021ba memoriei virtuale pe toate gazdele pe care firele sunt executate simultan. <\/p>\n

Stiva software Popcorn include patch-uri<\/a><\/noindex> \u00een nucleul Linux \u0219i biblioteca<\/a><\/noindex> cu teste care demonstreaz\u0103 cum pot fi folosite apelurile de sistem Popcorn pentru migrarea firelor \u00een aplica\u021biile executate distribuit. La nivelul nucleului, sunt propuse extensii pentru subsistemul memoriei virtuale, cu implementarea memoriei partajate distribuite (distributed shared memory), care permite proceselor de pe diferite gazde s\u0103 acceseze un spa\u021biu de adres\u0103 virtual comun \u0219i coerent. Coeren\u021ba paginilor din memoria virtual\u0103 este asigurat\u0103 printr-un protocol care replic\u0103 pe gazd\u0103 paginile de memorie la accesul pentru citire \u0219i anuleaz\u0103 paginile de memorie la efectuarea scrierii. <\/p>\n

Interac\u021biunea dintre gazde se realizeaz\u0103 printr-un handler de mesaje care opereaz\u0103 la nivel de nucleu, transmi\u021b\u00e2ndu-se printr-un socket TCP. Se observ\u0103 c\u0103 TCP\/IP este utilizat pentru a simplifica depanarea \u0219i testarea \u00een timpul dezvolt\u0103rii. Dezvoltatorii \u00een\u021beleg c\u0103, din punct de vedere al securit\u0103\u021bii \u0219i performan\u021bei, TCP\/IP nu este cea mai bun\u0103 metod\u0103 de transmitere a con\u021binutului structurilor nucleului \u0219i a paginilor de memorie \u00eentre gazde. Toate gazdele pe care ruleaz\u0103 aplica\u021bii distribuite trebuie s\u0103 aib\u0103 un nivel de \u00eencredere identic. Dup\u0103 stabilizarea algoritmilor de baz\u0103, va fi aplicat un mijloc de transport mai eficient.<\/p>\n

Popcorn evolueaz\u0103 din 2014 ca un proiect de cercetare pentru a explora posibilit\u0103\u021bile cre\u0103rii de aplica\u021bii distribuite, fluxurile c\u0103rora pot fi executate pe diferite noduri \u00een sisteme de calcul heterogene<\/a><\/noindex> , \u00een care pot fi combinate nuclee pe baza unor arhitecturi diferite de seturi de instruc\u021biuni (Xeon\/Xeon-Phi, ARM\/x86, CPU\/GPU\/FPGA). Setul de patch-uri propus pentru dezvoltatorii kernel-ului Linux suport\u0103 doar execu\u021bia pe gazde cu CPU x86, dar exist\u0103 \u0219i o variant\u0103 mai func\u021bional\u0103, Popcorn Linux, care permite rularea aplica\u021biilor pe gazde cu arhitecturi CPU diferite (x86 \u0219i ARM). Pentru a utiliza Popcorn \u00een medii heterogene, este necesar s\u0103 se foloseasc\u0103 un compiler<\/a><\/noindex> bazat pe LLVM. \u00cen cazul execu\u021biei distribuite pe gazde cu o singur\u0103 arhitectur\u0103, recompilarea cu un anumit compiler nu este necesar\u0103.<\/p>\n

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

cu privire la dependen\u021ba Tor Browser de infrastructura Mozilla. S\u0103 reamintim c\u0103 utilizatorilor Tor Browser, din cauza problemei cu certificatul, anun\u021b<\/a><\/noindex> despre un proiect asem\u0103n\u0103tor Telefork<\/a><\/noindex> cu implementarea unui prototip ini\u021bial de API pentru a rula procese fiice pe alte computere din cluster (similar cu fork(), dar mut\u0103 procesul ramificat pe un alt computer).
\n Codul este scris \u00een limbajul Rust \u0219i deocamdat\u0103 permite doar clonarea celor mai simple procese, care nu utilizeaz\u0103 resurse sistemice, cum ar fi fi\u0219ierele. Atunci c\u00e2nd se efectueaz\u0103 apelul telefork, memoria \u0219i structurile legate de proces sunt clonate pe o alt\u0103 gazd\u0103, pe care ruleaz\u0103 un procesor server (telepad). Prin ptrace, reflec\u021bia memoriei procesului este serializat\u0103 \u0219i, \u00eempreun\u0103 cu starea procesului \u0219i registrele, este transferat\u0103 pe o alt\u0103 gazd\u0103. API-ul permite, de asemenea, salvarea st\u0103rii procesului \u00eentr-un fi\u0219ier \u0219i restaurarea prin intermediul acestuia.<\/p>\n

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

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

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[…]<\/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\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\udd47Pentru kernel-ul Linux se dezvolt\u0103 un sistem de execu\u021bie distribuit\u0103 a fluxurilor Popcorn | ProHoster","description":"Universitatea Politehnic\u0103 din Virginia a propus pentru discu\u021bie dezvoltatorilor kernel-ului Linux un set de patch-uri cu implementarea 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