{"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\/cs\/blog\/news\/dlya-python-predlozhen-jit-kompilyator-ispolzuyushhij-tehniku-copy-and-patch","title":{"rendered":"Pro Python byl navr\u017een JIT kompil\u00e1tor, kter\u00fd pou\u017e\u00edv\u00e1 techniku copy-and-patch.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Brandt Bucher z Microsoftu, kter\u00fd pat\u0159\u00ed mezi hlavn\u00ed v\u00fdvoj\u00e1\u0159e CPython a pracuje v t\u00fdmu zam\u011b\u0159en\u00e9m na zvy\u0161ov\u00e1n\u00ed v\u00fdkonu CPythonu, publikoval implementaci JIT kompil\u00e1toru pro Python, vyu\u017e\u00edvaj\u00edc\u00ed techniku Copy-and-Patch. Publikace JIT byla na\u010dasov\u00e1na na V\u00e1noce a jej\u00ed ozn\u00e1men\u00ed je naps\u00e1no ve ver\u0161\u00edch. <\/p>\n

Navrhovan\u00fd JIT se vyzna\u010duje velmi vysokou rychlost\u00ed generov\u00e1n\u00ed k\u00f3du, jednoduchost\u00ed \u00fadr\u017eby a plnou integrac\u00ed s interpretem. Navrhovan\u00e1 metoda umo\u017e\u0148uje automaticky p\u0159ev\u00e9st interpreter napsan\u00fd v jazyce C na JIT kompil\u00e1tor, bez nutnosti samostatn\u00e9ho vytv\u00e1\u0159en\u00ed logiky generov\u00e1n\u00ed k\u00f3du a bez ru\u010dn\u00edho vytv\u00e1\u0159en\u00ed assemblerov\u00fdch reprezentac\u00ed. P\u0159i tomto p\u0159\u00edstupu oprava chyby v interpreteru automaticky povede k odstran\u011bn\u00ed t\u00e9ho\u017e probl\u00e9mu v JIT, proto\u017ee se pou\u017e\u00edv\u00e1 spole\u010dn\u00fd gener\u00e1tor k\u00f3du. <\/p>\n

Pr\u00e1ce metody Copy-and-Patch spo\u010d\u00edv\u00e1 v tom, \u017ee relokace k\u00f3du v pam\u011bti p\u0159i na\u010d\u00edt\u00e1n\u00ed linkerem objektov\u00fdch soubor\u016f a nahrazov\u00e1n\u00ed strojov\u00fdch instrukc\u00ed m\u00edsto bajtk\u00f3du v JIT jsou podobn\u00e9 \u00fakoly. P\u0159i pr\u00e1ci JIT b\u011bhem vykon\u00e1v\u00e1n\u00ed programu doch\u00e1z\u00ed k proch\u00e1zen\u00ed instrukc\u00ed bajtk\u00f3du vytvo\u0159en\u00fdch interpretem a kop\u00edrov\u00e1n\u00ed pro ka\u017edou instrukci p\u0159edem zkompilovan\u00e9ho strojov\u00e9ho k\u00f3du do oblasti pam\u011bti s vykon\u00e1van\u00fdm k\u00f3dem, stejn\u011b jako k dynamick\u00e9 \u00faprav\u011b instrukc\u00ed pro nahrazen\u00ed zpracov\u00e1van\u00fdmi daty (JIT kop\u00edruje p\u0159ipraven\u00e9 \u0161ablony ji\u017e zkompilovan\u00fdch funkc\u00ed a nahrazuje v nich pot\u0159ebn\u00e9 hodnoty, jako jsou argumenty a konstanty). P\u0159i na\u010d\u00edt\u00e1n\u00ed objektov\u00fdch soubor\u016f tak\u00e9 doch\u00e1z\u00ed ke kop\u00edrov\u00e1n\u00ed strojov\u00e9ho k\u00f3du do pam\u011bti a nahrazov\u00e1n\u00ed extern\u00edch symbol\u016f. <\/p>\n

V Copy-and-Patch JIT pomoc\u00ed LLVM vznik\u00e1 objektov\u00fd soubor ve form\u00e1tu ELF, kter\u00fd obsahuje informace o instrukc\u00edch bajtk\u00f3du a \u00fadaje o pot\u0159ebn\u00e9 v\u00fdm\u011bn\u011b dat. JIT nahrazuje b\u011bhem interpretace programu vytv\u00e1\u0159en\u00e9 instrukce bajtk\u00f3du reprezentacemi ve strojov\u00e9m k\u00f3du, p\u0159i\u010dem\u017e z\u00e1rove\u0148 dosazuje pot\u0159ebn\u00e1 data pro v\u00fdpo\u010dty. Realizace JIT vy\u017eaduje jako z\u00e1vislost LLVM b\u011bhem f\u00e1ze sestaven\u00ed, ale runtime komponenty nejsou v\u00e1z\u00e1ny na extern\u00ed z\u00e1vislosti a skl\u00e1daj\u00ed se p\u0159ibli\u017en\u011b ze 300 ru\u010dn\u011b napsan\u00fdch \u0159\u00e1dk\u016f v jazyce C a 3000 vygenerovan\u00fdch \u0159\u00e1dk\u016f k\u00f3du v C. <\/p>\n

V porovn\u00e1n\u00ed s tradi\u010dn\u00edm JIT n\u00e1strojem (LLVM -O0) navrhovan\u00fd JIT poskytuje generaci k\u00f3du 100kr\u00e1t rychlej\u0161\u00ed a v\u00fdsledn\u00fd k\u00f3d je o 15 % rychlej\u0161\u00ed. V porovn\u00e1n\u00ed s kompilac\u00ed do WebAssembly (Liftoff) nov\u00fd JIT generuje k\u00f3d 5kr\u00e1t rychleji a v\u00fdsledn\u00fd k\u00f3d funguje o 50 % rychleji. P\u0159i srovn\u00e1n\u00ed nov\u00e9ho JIT s optimalizuj\u00edc\u00edm JIT (LuaJIT), kter\u00fd pou\u017e\u00edv\u00e1 ru\u010dn\u011b psan\u00fd assemblerov\u00fd k\u00f3d, se navrhovan\u00e1 varianta uk\u00e1zala b\u00fdt rychlej\u0161\u00ed v 13 z 44 test\u016f, p\u0159i\u010dem\u017e pr\u016fm\u011brn\u011b zaostala v v\u00fdkonu o 35 %, a to p\u0159i zna\u010dn\u00e9m zjednodu\u0161en\u00ed \u00fadr\u017eby a sn\u00ed\u017een\u00ed \u00farovn\u011b slo\u017eitosti implementace.

\r\n \"P\u0159ehr\u00e1t\r\n
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Zdroj: 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 \u0434\u043b\u044f Python, \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0449\u0443\u044e \u0442\u0435\u0445\u043d\u0438\u043a\u0443 Copy-and-Patch. \u041f\u0443\u0431\u043b\u0438\u043a\u0430\u0446\u0438\u044f JIT \u043f\u0440\u0438\u0443\u0440\u043e\u0447\u0435\u043d\u0430 \u043a \u0420\u043e\u0436\u0434\u0435\u0441\u0442\u0432\u0443 \u0438 \u0430\u043d\u043e\u043d\u0441 \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u0432 \u0441\u0442\u0438\u0445\u0430\u0445. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0439 JIT \u043f\u0440\u0438\u043c\u0435\u0447\u0430\u0442\u0435\u043b\u0435\u043d \u043e\u0447\u0435\u043d\u044c \u0432\u044b\u0441\u043e\u043a\u043e\u0439 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c\u044e \u0433\u0435\u043d\u0435\u0440\u0430\u0446\u0438\u0438 \u043a\u043e\u0434\u0430, \u043f\u0440\u043e\u0441\u0442\u043e\u0442\u043e\u0439 \u0441\u043e\u043f\u0440\u043e\u0432\u043e\u0436\u0434\u0435\u043d\u0438\u044f \u0438 \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\udd47Pro Python byl navr\u017een JIT kompil\u00e1tor, kter\u00fd pou\u017e\u00edv\u00e1 techniku copy-and-patch | 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