{"id":99458,"date":"2021-03-17T16:22:53","date_gmt":"2021-03-17T14:22:53","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/pervyj-stabilnyj-vypusk-zlib-ng-vysokoproizvoditelnogo-forka-zlib"},"modified":"2021-03-17T16:22:53","modified_gmt":"2021-03-17T14:22:53","slug":"pervyj-stabilnyj-vypusk-zlib-ng-vysokoproizvoditelnogo-forka-zlib","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/pervyj-stabilnyj-vypusk-zlib-ng-vysokoproizvoditelnogo-forka-zlib","title":{"rendered":"Prvn\u00ed stabiln\u00ed verze zlib-ng, vysoce v\u00fdkonn\u00e9ho forku zlib","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Byla vyd\u00e1na verze knihovny zlib-ng 2.0, kter\u00e1 je ozna\u010dena jako prvn\u00ed stabiln\u00ed vyd\u00e1n\u00ed projektu (dopl\u0148kov\u00e1 verze 2.0.1 je ji\u017e k dispozici). Zlib-ng je kompatibiln\u00ed se zlib na \u00farovni API, ale nab\u00edz\u00ed dodate\u010dn\u00e9 optimalizace, kter\u00e9 nebyly p\u0159ijaty do ofici\u00e1ln\u00edho repozit\u00e1\u0159e zlib z d\u016fvodu konzervativn\u00edho p\u0159\u00edstupu k p\u0159ij\u00edm\u00e1n\u00ed zm\u011bn. D\u00e1le byla navr\u017eena modernizovan\u00e1 API, zalo\u017een\u00e1 na zlib, ale upraven\u00e1 pro zjednodu\u0161en\u00ed p\u0159enositelnosti. K\u00f3d projektu je naps\u00e1n v jazyce C a je distribuov\u00e1n pod licenc\u00ed Zlib. <\/p>\n

Testy proveden\u00e9 na syst\u00e9mech x86_64 uk\u00e1zaly, \u017ee p\u0159i prov\u00e1d\u011bn\u00ed kompresn\u00edch operac\u00ed je Zlib-ng p\u0159ibli\u017en\u011b 4kr\u00e1t rychlej\u0161\u00ed ne\u017e zlib a 2,1kr\u00e1t rychlej\u0161\u00ed ne\u017e gzip. P\u0159i dekompresi je Zlib-ng p\u0159ibli\u017en\u011b 2,4kr\u00e1t rychlej\u0161\u00ed ne\u017e zlib a 1,8kr\u00e1t rychlej\u0161\u00ed ne\u017e gzip. Vysok\u00e9ho zv\u00fd\u0161en\u00ed v\u00fdkonu komprese\/dekomprese bylo dosa\u017eeno p\u0159edev\u0161\u00edm d\u00edky vyu\u017eit\u00ed vektorov\u00fdch instrukc\u00ed SSE*, AVX2, VSX a Neon. <\/p>\n

Byla p\u0159id\u00e1na implementace algoritmu pro v\u00fdpo\u010det kontroln\u00edch sou\u010dt\u016f Adler32, optimalizovan\u00e1 pomoc\u00ed instrukc\u00ed SSSE3, AVX2, Neon a VSX, implementace CRC32-B zalo\u017een\u00e1 na PCLMULQDQ a ACLE, vylep\u0161en\u00e9 hashovac\u00ed tabulky, implementace hashe Slide zalo\u017een\u00e1 na SSE2, AVX2, Neon a VSX, a operace porovn\u00e1v\u00e1n\u00ed zalo\u017een\u00e9 na SSE4.2 a AVX2. Sou\u010d\u00e1st\u00ed jsou tak\u00e9 c\u00edlen\u00e9 zm\u011bny na zlep\u0161en\u00ed v\u00fdkonu, kter\u00e9 byly pou\u017eity ve forks od spole\u010dnost\u00ed Intel a Cloudflare. Proces pr\u00e1ce s buffery byl optimalizov\u00e1n. Byla p\u0159id\u00e1na podpora pro buildovac\u00ed syst\u00e9my CMake a NMake. Pro testov\u00e1n\u00ed byly pou\u017eity syst\u00e9my kontinu\u00e1ln\u00ed integrace. <\/p>\n

Krom\u011b optimalizac\u00ed obsahuje Zlib-ng tak\u00e9 shrom\u00e1\u017ed\u011bn\u00e9 patche z distribuc\u00ed bal\u00ed\u010dk\u016f a do\u0161lo k vy\u010di\u0161t\u011bn\u00ed k\u00f3du od obch\u00e1zej\u00edc\u00edch \u0159e\u0161en\u00ed, kter\u00e1 byla v zlib pou\u017e\u00edv\u00e1na k podpo\u0159e star\u00fdch kompil\u00e1tor\u016f a platforem, ale br\u00e1nila implementaci efektivn\u011bj\u0161\u00edch metod (nap\u0159\u00edklad omezen\u00ed pot\u0159ebn\u00e1 pro podporu 16bitov\u00fdch syst\u00e9m\u016f a nekompatibiln\u00ed kompil\u00e1tory ANSI C). Byla provedena pr\u00e1ce na identifikaci a oprav\u011b chyb, kter\u00e9 odhalily statick\u00e9 analyz\u00e1tory, syst\u00e9my fuzzing testov\u00e1n\u00ed a n\u00e1stroje pro zji\u0161\u0165ov\u00e1n\u00ed probl\u00e9m\u016f s pam\u011bt\u00ed (AddressSanitizer a MemorySanitizer).
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0414\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u0440\u0435\u043b\u0438\u0437 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 zlib-ng 2.0 \u043a\u043e\u0442\u043e\u0440\u044b\u0439 \u043e\u0442\u043c\u0435\u0447\u0435\u043d \u043a\u0430\u043a \u043f\u0435\u0440\u0432\u044b\u0439 \u0441\u0442\u0430\u0431\u0438\u043b\u044c\u043d\u044b\u0439 \u0432\u044b\u043f\u0443\u0441\u043a \u043f\u0440\u043e\u0435\u043a\u0442\u0430 (\u0441\u043b\u0435\u0434\u043e\u043c \u0443\u0436\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0435\u043d \u043a\u043e\u0440\u0440\u0435\u043a\u0442\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0432\u044b\u043f\u0443\u0441\u043a 2.0.1). Zlib-ng \u0441\u043e\u0432\u043c\u0435\u0441\u0442\u0438\u043c \u0441 zlib \u043d\u0430 \u0443\u0440\u043e\u0432\u043d\u0435 API, \u043d\u043e \u043f\u0440\u0435\u0434\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442 \u0434\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0435 \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438, \u043d\u0435 \u043f\u0440\u0438\u043d\u044f\u0442\u044b\u0435 \u0432 \u043e\u0444\u0438\u0446\u0438\u0430\u043b\u044c\u043d\u044b\u0439 \u0440\u0435\u043f\u043e\u0437\u0438\u0442\u043e\u0440\u0438\u0439 zlib \u0438\u0437-\u0437\u0430 \u043a\u043e\u043d\u0441\u0435\u0440\u0432\u0430\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u043f\u043e\u0434\u0445\u043e\u0434\u0430 \u043a \u043f\u0440\u0438\u0451\u043c\u0443 \u0438\u0437\u043c\u0435\u043d\u0435\u043d\u0438\u0439. \u0414\u043e\u043f\u043e\u043b\u043d\u0438\u0442\u0435\u043b\u044c\u043d\u043e \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d \u043c\u043e\u0434\u0435\u0440\u043d\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0439 API, \u043e\u0441\u043d\u043e\u0432\u0430\u043d\u043d\u044b\u0439 \u043d\u0430 zlib, \u043d\u043e \u0438\u0437\u043c\u0435\u043d\u0451\u043d\u043d\u044b\u0439 \u0434\u043b\u044f \u0443\u043f\u0440\u043e\u0449\u0435\u043d\u0438\u044f \u043f\u043e\u0440\u0442\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f. \u041a\u043e\u0434 \u043f\u0440\u043e\u0435\u043a\u0442\u0430 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