{"id":112509,"date":"2023-12-26T15:10:22","date_gmt":"2023-12-26T13:10:22","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/dlya-python-predlozhen-jit-kompilyator-ispolzuyushhij-tehniku-copy-and-patch"},"modified":"2023-12-26T15:10:22","modified_gmt":"2023-12-26T13:10:22","slug":"dlya-python-predlozhen-jit-kompilyator-ispolzuyushhij-tehniku-copy-and-patch","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hr\/blog\/news\/dlya-python-predlozhen-jit-kompilyator-ispolzuyushhij-tehniku-copy-and-patch","title":{"rendered":"Za Python je predlo\u017een JIT-kompajler koji koristi tehniku copy-and-patch","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Brandt Bucher iz Microsofta, koji je jedan od glavnih programera CPythona i radi s timom koji se bavi pobolj\u0161anjem performansi CPython interpretera, objavio je implementaciju JIT kompajlera za Python koja koristi Copy-and-Patch tehniku. Objavljivanje JIT-a uskla\u0111eno je s Bo\u017ei\u0107em, a najava je napisana u stihu. <\/p>\n

Predlo\u017eeni JIT se odlikuje vrlo visokom brzinom generiranja koda, jednostavno\u0161\u0107u odr\u017eavanja i potpunom integracijom s interpreterom. Predlo\u017eena metoda omogu\u0107uje automatsku transformaciju interpeter napisanog u C-u u JIT kompajler bez zasebnog oblikovanja logike generiranja koda i bez ru\u010dnog stvaranja asemberskih reprezentacija. Ovaj pristup osigurava da ispravak gre\u0161ke u interpreteru automatski uklanja istu problematiku u JIT-u, jer se koristi zajedni\u010dki generator koda. <\/p>\n

Rad Copy-and-Patch metode temelji se na sli\u010dnosti zadataka koji uklju\u010duju relokaciju koda u memoriji prilikom u\u010ditavanja objektnog datoteka i umetanja ma\u0161inskih instrukcija umjesto bajtkoda u JIT. Kada JIT radi tijekom izvr\u0161enja programa, prolazi kroz instrukcije bajtkoda koje je stvorio interpreter, te za svaku instrukciju kopira unaprijed kompajlirani ma\u0161inski kod u podru\u010dje memorije koje sadr\u017ei izvr\u0161ni kod, kao i dinami\u010dki mijenja instrukcije za umetanje obra\u0111enih podataka (JIT kopira gotove predlo\u0161ke ve\u0107 kompajliranih funkcija i umetne potrebne vrijednosti, kao \u0161to su argumenti i konstante). Prilikom u\u010ditavanja objektnog datoteka tako\u0111er se obavlja kopiranje ma\u0161inskog koda u memoriju i umetanje vanjskih simbola. <\/p>\n

U Copy-and-Patch JIT, uz pomo\u0107 LLVM, sastavlja se objektna datoteka u ELF formatu koja sadr\u017ei podatke o instrukcijama bajtkoda i informacije o potrebnim zamjenama podataka. JIT zamjenjuje generirane instrukcije bajtkoda tijekom interpretacije programa s njihovim reprezentacijama u ma\u0161inskom kodu, istovremeno umetnuv\u0161i podatke potrebne za izra\u010dune. Implementacija JIT-a zahtijeva kao zavisnost LLVM tijekom faze izgradnje, ali runtime komponente nisu vezane uz vanjske ovisnosti i svode se otprilike na 300 ru\u010dno pisanih redaka u C-u i 3000 generiranih redaka koda u C-u. <\/p>\n

U usporedbi s tradicionalnim JIT alatom (LLVM -O0), predlo\u017eeni JIT osigurava 100 puta br\u017eu generaciju koda i 15% br\u017ei rezultantni kod. U usporedbi s kompajliranjem u WebAssembly (Liftoff), novi JIT generira kod 5 puta br\u017ee, a rezultantni kod radi 50% br\u017ee. Ako usporedimo novi JIT s optimiziraju\u0107im JIT-om (LuaJIT), koji koristi ru\u010dno napisani kod na asembleru, predlo\u017eena opcija pokazala se br\u017eom u 13 od 44 testa, dok je u prosjeku bila sporija za 35%, uz zna\u010dajno pojednostavljenje odr\u017eavanja i smanjenje razine slo\u017eenosti implementacije.

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

\u0411\u0440\u0430\u043d\u0434\u0442 \u0411\u0443\u043a\u0435\u0440 (Brandt Bucher) \u0438\u0437 \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0438 Microsoft, \u0432\u0445\u043e\u0434\u044f\u0449\u0438\u0439 \u0432 \u0447\u0438\u0441\u043b\u043e core-\u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 CPython \u0438 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0439 \u043a\u043e\u043c\u0430\u043d\u0434\u0435, \u0437\u0430\u043d\u0438\u043c\u0430\u044e\u0449\u0435\u0439\u0441\u044f \u0443\u0432\u0435\u043b\u0438\u0447\u0435\u043d\u0438\u0435\u043c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0430\u0442\u043e\u0440\u0430 CPython, \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044e JIT-\u043a\u043e\u043c\u043f\u0438\u043b\u044f\u0442\u043e\u0440\u0430 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\u043f\u043e\u043b\u043d\u043e\u0439 \u0438\u043d\u0442\u0435\u0433\u0440\u0430\u0446\u0438\u0435\u0439 \u0441 \u0438\u043d\u0442\u0435\u0440\u043f\u0440\u0435\u0442\u0430\u0442\u043e\u0440\u043e\u043c. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 \u043c\u0435\u0442\u043e\u0434 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-112509","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\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\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Za Python je predlo\u017een JIT kompajler koji koristi tehniku copy-and-patch | ProHoster","description":"Brandt Bucher 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