{"id":90050,"date":"2020-07-28T13:42:44","date_gmt":"2020-07-28T11:42:44","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/google-nachal-otkrytie-realizaczii-modeli-potokov-mn"},"modified":"2020-07-28T13:42:44","modified_gmt":"2020-07-28T11:42:44","slug":"google-nachal-otkrytie-realizaczii-modeli-potokov-mn","status":"publish","type":"post","link":"https:\/\/prohoster.info\/et\/blog\/news\/google-nachal-otkrytie-realizaczii-modeli-potokov-mn","title":{"rendered":"Google alustas M:N mudeli voogude rakendamise kasutusele v\u00f5tmist","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Google'i ettev\u00f5te esine<\/a><\/noindex> Linuxi tuuma rakendamiseks esimesed pat\u0161ide komplekti, mis sisaldavad komponente, mis on vajalikud M:N voogude mudeli t\u00f6\u00f6tamiseks. Google's on algatus seotud suletud uste taga arendatud API avamisega SwitchTo<\/a><\/noindex> Linuxi tuumale, mis toetab kasutusrikkal veidi rakendatud mitmevoogset alams\u00fcsteemi, mis kasutab M:N voogude mudelit. Alams\u00fcsteemi kasutatakse Google'is teenuste toetamiseks, mis n\u00f5uavad minimaalset viivitust. Voogude planeerimine ja haldamine toimub t\u00e4ielikult kasutusrikkal, mis oluliselt v\u00e4hendab konteksti vahetamise operatsioonide arvu, minimeerides s\u00fcsteemik\u00f5nesid.<\/p>\n

Linuxi tuuma tasemel selle alams\u00fcsteemi toimimise tagamiseks on rakendatud API SwitchTo, mis pakub kolme p\u00f5hioperatsiooni \u2014 wait, resume ja swap (vahetamine). Tuuma koosseisu lisamiseks on ette n\u00e4htud uue operatsiooni kood FUTEX_SWAP, mis t\u00e4iendab FUTEX_WAIT ja FUTEX_WAKE<\/a><\/noindex>, ja annab aluse mitmevoogsete raamatukogude loomiseks kasutusrikkal. FUTEX_SWAP-i saab kasutada ka erinevate \u00fclesannete vahel s\u00f5numite edastamiseks, sarnaselt RPC-le. N\u00e4iteks praegu peab s\u00f5numi edastamiseks \u00fclesannete vahel teostama v\u00e4hemalt neli FUTEX_WAIT ja FUTEX_WAKE k\u00f5net, samas kui FUTEX_SWAP'i kasutamine v\u00f5imaldab j\u00f5uda \u00fche operatsioonini, mis toimub 5-10 korda kiiremini.<\/p>\n

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

Praegu rakendatakse peamiselt 1:1 ja N:1 voogude mudeleid. 1:1 mudelit kasutatakse NPTL<\/a><\/noindex> (POSIX vood) ja LinuxThreads<\/a><\/noindex>, mis eeldab otse kasutusrikkal oleva voogu seostamist tuumataseme (t\u00e4itmisplaani\u00fcksuse) vooga. N:1 mudel on ellu viidud GNU Pth<\/a><\/noindex>, mis viib voogude jaotamise kasutusrikkale ja v\u00f5imaldab N voogu kasutusrikkal seonduda \u00fche vooga tuumas, samas kui tuumal ei ole teavet kasutusrikkal olevate voogude kohta.<\/p>\n

Mudelil 1:1 on peamine puudus suur kontekstitasakaalu vahetamise kulu tuuma ja kasutaja ruumi vahel. Mudel N:1 lahendab selle probleemi, kuid loob uue \u2014 kuna tuumavood on t\u00e4itmise planeerimise lahutamatud \u00fcksused, ei saa kasutaja vood, mis on seotud \u00fche tuumavoodiga, CPUde vahel skaleeruda ning need j\u00e4\u00e4vad kinni \u00fchte tuuma CPU.<\/p>\n

M:N mudel on h\u00fcbriid ja k\u00f5rvaldab k\u00f5ik eespool mainitud puudused, sidudes N voogu kasutajaruumis M vooga operatsioonis\u00fcsteemi tuumas, mis v\u00f5imaldab v\u00e4hendada konteksti vahetamise kulusid ja pakkuda skaleerimist CPU tuumade vahel. Selle variandi hind on voogude ajakavalduse teostamise keerukuse suurendamine kasutajaruumis ja vajadus koordineerimismehhanismide j\u00e4rele tuuma ajakavaldusega.<\/p>\n

\r\n \"M\u00e4ngi\r\n
<\/div>\r\n <\/div><\/center><\/p>\n

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

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

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\u0440\u0430\u0437\u0432\u0438\u0432\u0430\u0432\u0448\u0435\u0433\u043e\u0441\u044f \u0437\u0430 \u0437\u0430\u043a\u0440\u044b\u0442\u044b\u043c\u0438 \u0434\u0432\u0435\u0440\u044f\u043c\u0438 API SwitchTo \u0434\u043b\u044f \u044f\u0434\u0440\u0430 Linux, \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0438\u0432\u0430\u044e\u0449\u0435\u0433\u043e \u0440\u0430\u0431\u043e\u0442\u0443 \u0440\u0435\u0430\u043b\u0438\u0437\u043e\u0432\u0430\u043d\u043d\u043e\u0439 \u0432 \u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0441\u0442\u0432\u0435 \u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u0442\u0435\u043b\u044f \u043c\u043d\u043e\u0433\u043e\u043f\u043e\u0442\u043e\u0447\u043d\u043e\u0439 \u043f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u044b, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u044e\u0449\u0435\u0439 \u043c\u043e\u0434\u0435\u043b\u044c \u043f\u043e\u0442\u043e\u043a\u043e\u0432 M:N. \u041f\u043e\u0434\u0441\u0438\u0441\u0442\u0435\u043c\u0430 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u0442\u0441\u044f \u0432 Google \u0434\u043b\u044f \u043e\u0431\u0435\u0441\u043f\u0435\u0447\u0435\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":90051,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-90050","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\udd47Google alustas M:N voogude mudeli rakendamise avamist | ProHoster","description":"Google esitas Linuxi tuuma kaasamiseks esimese komplekti pat\u0161e teostuse 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