{"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\/sk\/blog\/news\/dlya-yadra-linux-razvivaetsya-sistema-raspredelyonnogo-vypolneniya-potokov-popcorn","title":{"rendered":"Pro Linux j\u00e1dro se vyv\u00edj\u00ed syst\u00e9m distribuovan\u00e9ho vykon\u00e1v\u00e1n\u00ed vl\u00e1ken Popcorn","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Virginia Polytechnic Institute and State University navrhol<\/a><\/noindex> na diskusiu medzi v\u00fdvoj\u00e1rmi jadra Linux s implement\u00e1ciou s\u00faboru patchov pre syst\u00e9m distribuovan\u00e9ho vykon\u00e1vania vl\u00e1kien Popcorn<\/a><\/noindex> (Distributed Thread Execution), ktor\u00fd umo\u017e\u0148uje organizova\u0165 vykon\u00e1vanie aplik\u00e1ci\u00ed na viacer\u00fdch po\u010d\u00edta\u010doch s distrib\u00faciou a transparentnou migr\u00e1ciou vl\u00e1ken medzi hostite\u013emi. Pomocou Popcorn m\u00f4\u017eu by\u0165 aplik\u00e1cie spusten\u00e9 na jednom hostite\u013eovi a n\u00e1sledne bez zastavenia prenosene na in\u00fd hostite\u013e. V viacvl\u00e1knov\u00fdch programoch je povolen\u00e1 migr\u00e1cia na in\u00e9 hostite\u013esk\u00e9 syst\u00e9my jednotliv\u00fdch vl\u00e1ken. <\/p>\n

Na rozdiel od projektu CRIU<\/a><\/noindex>, ktor\u00fd umo\u017e\u0148uje ulo\u017ei\u0165 stav procesu a pokra\u010dova\u0165 vo vykon\u00e1van\u00ed na inom syst\u00e9me, Popcorn poskytuje bezprobl\u00e9mov\u00fa a dynamick\u00fa migr\u00e1ciu medzi hostite\u013emi po\u010das vykon\u00e1vania aplik\u00e1cie, nevy\u017eaduje \u017eiadne kroky od pou\u017e\u00edvate\u013ea a zabezpe\u010duje konzistenciu virtu\u00e1lnej pam\u00e4te na v\u0161etk\u00fdch hostite\u013eoch, na ktor\u00fdch sa z\u00e1rove\u0148 vykon\u00e1vaj\u00fa vl\u00e1kna. <\/p>\n

Softv\u00e9rov\u00fd stack Popcorn sa sklad\u00e1 z z\u00e1platy<\/a><\/noindex> jadra Linux a kni\u017enice<\/a><\/noindex> s testami, ktor\u00e9 demon\u0161truj\u00fa, ako m\u00f4\u017ee by\u0165 mo\u017en\u00e9 pou\u017e\u00edva\u0165 syst\u00e9mov\u00e9 volania Popcorn na migr\u00e1ciu vl\u00e1ken v distribuovan\u00fdch aplik\u00e1ci\u00e1ch. Na \u00farovni jadra s\u00fa navrhnut\u00e9 roz\u0161\u00edrenia k subsyst\u00e9mu virtu\u00e1lnej pam\u00e4te s implement\u00e1ciou zdie\u013eanej distribuovanej pam\u00e4te (distributed shared memory), ktor\u00e1 umo\u017e\u0148uje procesom na r\u00f4znych hostite\u013eoch pristupova\u0165 k spolo\u010dn\u00e9mu a konzistentn\u00e9mu virtu\u00e1lnemu adresn\u00e9mu priestoru. Konzistencia str\u00e1n virtu\u00e1lnej pam\u00e4te je zabezpe\u010den\u00e1 pomocou protokolu, ktor\u00fd replikovuje na hostite\u013e str\u00e1nky pam\u00e4te pri pr\u00edstupe na \u010d\u00edtanie a zru\u0161uje str\u00e1nky pam\u00e4te pri vykon\u00e1van\u00ed z\u00e1pisu. <\/p>\n

Interakcia medzi hostite\u013emi prebieha pomocou spracovate\u013ea spr\u00e1v funguj\u00faceho na \u00farovni jadra, ktor\u00fd sa pren\u00e1\u0161a cez TCP-soket. Je poznamenan\u00e9, \u017ee TCP\/IP sa pou\u017e\u00edva na zjednodu\u0161enie ladenia a testovania po\u010das v\u00fdvoja. V\u00fdvoj\u00e1ri si uvedomuj\u00fa, \u017ee z h\u013eadiska bezpe\u010dnosti a v\u00fdkonu nie je TCP\/IP najlep\u0161\u00edm sp\u00f4sobom prenosu obsahu \u0161trukt\u00far jadra a str\u00e1n pam\u00e4te medzi hostite\u013emi. V\u0161etky hostite\u013esk\u00e9 syst\u00e9my, na ktor\u00fdch sa vykon\u00e1vaj\u00fa distribuovan\u00e9 aplik\u00e1cie, musia ma\u0165 identick\u00fa \u00farove\u0148 d\u00f4very. Po stabiliz\u00e1cii z\u00e1kladn\u00fdch algoritmov bude pou\u017eit\u00fd efekt\u00edvnej\u0161\u00ed sp\u00f4sob prenosu.<\/p>\n

Popcorn sa vyv\u00edja od roku 2014 ako v\u00fdskumn\u00fd projekt zameran\u00fd na sk\u00famanie mo\u017enost\u00ed vytv\u00e1rania distribuovan\u00fdch aplik\u00e1ci\u00ed, ktor\u00fdch pr\u00fady m\u00f4\u017eu by\u0165 sp\u00fa\u0161\u0165an\u00e9 na r\u00f4znych uzloch v heterog\u00e9nnych<\/a><\/noindex> v\u00fdpo\u010dtov\u00fdch syst\u00e9moch, v ktor\u00fdch m\u00f4\u017eu by\u0165 kombinovan\u00e9 jadr\u00e1 zalo\u017een\u00e9 na r\u00f4znych architekt\u00farach in\u0161truk\u010dn\u00fdch s\u00faprav (Xeon\/Xeon-Phi, ARM\/x86, CPU\/GPU\/FPGA). Navrhnut\u00fd s\u00fabor patchov pre v\u00fdvoj\u00e1rov jadra Linux podporuje iba vykon\u00e1vanie na hostite\u013eoch s CPU x86, ale existuje aj funk\u010dnej\u0161ia verzia Popcorn Linux, ktor\u00e1 umo\u017e\u0148uje sp\u00fa\u0161\u0165anie aplik\u00e1ci\u00ed na hostite\u013eoch s r\u00f4znymi architekt\u00farami CPU (x86 a ARM). Na pou\u017eitie Popcornu v heterog\u00e9nnych prostrediach je potrebn\u00e9 pou\u017ei\u0165 \u0161peci\u00e1lny kompil\u00e1tor<\/a><\/noindex> na b\u00e1ze LLVM. Pri distribuovanom vykon\u00e1van\u00ed na hostite\u013eoch s jednou architekt\u00farou nie je potrebn\u00e1 prekompil\u00e1cia osobitn\u00fdm kompil\u00e1torom.<\/p>\n

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

Okrem toho mo\u017eno poznamena\u0165 ozn\u00e1menie<\/a><\/noindex> nie\u010do podobn\u00e9ho projektu Telefork<\/a><\/noindex> s implement\u00e1ciou po\u010diato\u010dn\u00e9ho prototypu API na sp\u00fa\u0161\u0165anie podriaden\u00fdch procesov na in\u00fdch po\u010d\u00edta\u010doch v klasteri (ako fork(), ale pres\u00fava vetven\u00fd proces na in\u00fd po\u010d\u00edta\u010d).
\n K\u00f3d je nap\u00edsan\u00fd v jazyku Rust a zatia\u013e umo\u017e\u0148uje klonova\u0165 iba najjednoduch\u0161ie procesy, v ktor\u00fdch nie s\u00fa pou\u017e\u00edvan\u00e9 syst\u00e9mov\u00e9 zdroje, ako s\u00fa s\u00fabory. Pri vykon\u00e1van\u00ed volania telefork sa pam\u00e4\u0165 a s procesom s\u00favisiace \u0161trukt\u00fary klonuj\u00fa na in\u00fd hostite\u013e, na ktorom be\u017e\u00ed serverov\u00fd spracovate\u013e (telepad). Pomocou ptrace sa odraz pam\u00e4te procesu serializuje a spolu so stavom procesu a registrami sa pren\u00e1\u0161a na in\u00fd hostite\u013e. API tie\u017e umo\u017e\u0148uje uklada\u0165 stav procesu do s\u00faboru a obnovi\u0165 ho cez tento s\u00fabor.<\/p>\n

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

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

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