{"id":144566,"date":"2025-10-09T17:11:54","date_gmt":"2025-10-09T15:11:56","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/sistema-szhatiya-openzl-operezhayushhaya-zstd-i-xz-po-skorosti-i-urovnyu-szhatiya-strukturirovannyh-dannyh"},"modified":"2025-10-09T17:11:54","modified_gmt":"2025-10-09T15:11:56","slug":"sistema-szhatiya-openzl-operezhayushhaya-zstd-i-xz-po-skorosti-i-urovnyu-szhatiya-strukturirovannyh-dannyh","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sk\/blog\/news\/sistema-szhatiya-openzl-operezhayushhaya-zstd-i-xz-po-skorosti-i-urovnyu-szhatiya-strukturirovannyh-dannyh","title":{"rendered":"Syst\u00e9m kompresie OpenZL, ktor\u00fd pred\u010d\u00ed Zstd a XZ z h\u013eadiska r\u00fdchlosti a \u00farovne kompresie \u0161trukt\u00farovan\u00fdch \u00fadajov","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Spolo\u010dnos\u0165 Meta* predstavila n\u00e1stroj na kompresiu a dekompresiu d\u00e1t OpenZL, ktor\u00fd v porovnan\u00ed s form\u00e1tmi Zstd a XZ vykazuje vy\u0161\u0161iu \u00farove\u0148 kompresie a r\u00fdchlos\u0165 pr\u00e1ce. OpenZL je navrhnut\u00fd na efekt\u00edvnu kompresiu \u0161trukt\u00farovan\u00fdch s\u00faborov d\u00e1t, napr\u00edklad t\u00fdch, ktor\u00e9 sa pou\u017e\u00edvaj\u00fa pri strojovom u\u010den\u00ed, a tie\u017e \u00falo\u017e\u00edsk, ktor\u00e9 obsahuj\u00fa polia s r\u00f4znymi opakuj\u00facimi sa typmi inform\u00e1ci\u00ed. K\u00f3d OpenZL je nap\u00edsan\u00fd v C\/C++ a je otvoren\u00fd pod licenciou BSD. <\/p>\n

Pri kompresii datab\u00e1zy s astronomick\u00fdm katal\u00f3gom hviezd SAO n\u00e1stroj OpenZL umo\u017enil zmen\u0161i\u0165 ve\u013ekos\u0165 d\u00e1t 2,06-kr\u00e1t, zatia\u013e \u010do algoritmus zstd zmen\u0161il inform\u00e1cie 1,31-kr\u00e1t a XZ 1,64-kr\u00e1t. Z\u00e1rove\u0148 bol OpenZL dvakr\u00e1t r\u00fdchlej\u0161\u00ed ako zstd (203 MB\/s oproti 115 MB\/s) a 65-kr\u00e1t r\u00fdchlej\u0161\u00ed ako XZ (203 MB\/s oproti 3,1 MB\/s). Rozbalenie v OpenZL bolo iba mierne pomal\u0161ie ako zstd (822 MB\/s oproti 890 MB\/s) a 27-kr\u00e1t r\u00fdchlej\u0161ie ako XZ.

\"Syst\u00e9m<\/center> <\/p>\n

OpenZL nie je algoritmus v\u0161eobecn\u00e9ho pou\u017eitia a vykazuje dobr\u00e9 v\u00fdsledky iba pre d\u00e1ta s vopred zn\u00e1mou \u0161trukt\u00farou. Pr\u00e1ca OpenZL spo\u010d\u00edva v adapt\u00edvnej gener\u00e1cii kompresora na z\u00e1klade dodan\u00e9ho opisu d\u00e1t. V d\u00f4sledku toho sa vytvor\u00ed k\u00f3d na kompresiu optimalizovan\u00fd pre konkr\u00e9tny form\u00e1t d\u00e1t. Na dekompresiu sa pou\u017e\u00edva univerz\u00e1lny dekompresor, kompatibiln\u00fd so v\u0161etk\u00fdmi generovan\u00fdmi kompresormi. <\/p>\n

Balenie a rozbalenie sa vykon\u00e1va pomocou jedn\u00e9ho n\u00e1stroja \u201ezli\u201c alebo kni\u017enice libopenzl. \u0160trukt\u00fara d\u00e1t je pop\u00edsan\u00e1 vo forme profilov. S\u00fa\u010das\u0165ou u\u017e je s\u00fabor preddefinovan\u00fdch profilov, ktor\u00e9 popisuj\u00fa typov\u00e9 form\u00e1ty ukladania. Napr\u00edklad profil pre form\u00e1t CSV alebo d\u00e1ta ulo\u017een\u00e9 vo forme po\u013ea 64-bitov\u00fdch \u010d\u00edsiel. Kompresia spo\u010d\u00edva vo v\u00fdbere profilu pr\u00edkazom \u201ezli list-profiles\u201c a spusten\u00ed procesu balenia pr\u00edkazom \u201ezli compress \u2014profile n\u00e1zov_profily\u201c. Na rozbalenie sta\u010d\u00ed spusti\u0165 \u201ezli decompress\u201c. <\/p>\n

Pre \u0161pecifick\u00e9 form\u00e1ty je potrebn\u00e9 vytvori\u0165 vlastn\u00fd profil pomocou pr\u00edkazu \u201ezli train\u201c, ktor\u00fd zis\u0165uje vzory v d\u00e1tach a vytv\u00e1ra profil s optim\u00e1lnou \u00farov\u0148ou kompresie. Pou\u017eit\u00edm mo\u017enosti \u201e\u2014pareto-frontier\u201c m\u00f4\u017ee by\u0165 vytvoren\u00fd profil modernizovan\u00fd smerom k ur\u00fdchleniu balenia alebo rozbalenia, na \u00fakor zn\u00ed\u017eenia \u00farovne kompresie. Pre opis zlo\u017eit\u00fdch form\u00e1tov s vnoren\u00fdmi \u0161trukt\u00farami a ur\u010denie rozlo\u017eenia form\u00e1tov d\u00e1t v \u0161trukt\u00farach m\u00f4\u017ee by\u0165 pou\u017eit\u00fd jazyk SDDL (Simple Data Description Language). <\/p>\n

Met\u00f3da vytv\u00e1rania optim\u00e1lnych bal\u00edkovate\u013eov je zalo\u017een\u00e1 na pou\u017eit\u00ed s\u00faboru primit\u00edvnych k\u00f3dova\u010dov, z ktor\u00fdch ka\u017ed\u00fd je najefekt\u00edvnej\u0161\u00ed pre ur\u010dit\u00e9 typy a sekvencie d\u00e1t. Pre kompresiu sa vytv\u00e1ra orientovan\u00fd acyklick\u00fd graf spracovania d\u00e1t, ktor\u00e9ho uzlami s\u00fa kodeky a hranami \u2014 varianty d\u00e1t v spracov\u00e1vanom form\u00e1te. V z\u00e1vislosti od typu d\u00e1t, ktor\u00e9 prich\u00e1dzaj\u00fa na vstup, sa vyberie re\u0165azec kodekov, ktor\u00fd optim\u00e1lne komprimuje prich\u00e1dzaj\u00faci \u00fadaj. Pri takejto organiz\u00e1cii je hlavi\u010dka s\u00faboru komprimovan\u00e1 jedn\u00fdm kodekom, pole s cel\u00fdmi \u010d\u00edslami \u2014 druh\u00fdm, pole so zvy\u0161uj\u00facim sa \u010d\u00edslom \u2014 tret\u00edm a pole s re\u0165azcov\u00fdmi d\u00e1tami \u2014 \u0161tvrt\u00fdm.

\"Syst\u00e9m<\/center>
\n
Zdroj: opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u041a\u043e\u043c\u043f\u0430\u043d\u0438\u044f Meta* \u043f\u0440\u0435\u0434\u0441\u0442\u0430\u0432\u0438\u043b\u0430 \u0438\u043d\u0441\u0442\u0440\u0443\u043c\u0435\u043d\u0442\u0430\u0440\u0438\u0439 \u0434\u043b\u044f \u0441\u0436\u0430\u0442\u0438\u044f \u0438 \u0440\u0430\u0441\u043f\u0430\u043a\u043e\u0432\u043a\u0438 \u0434\u0430\u043d\u043d\u044b\u0445 OpenZL, \u043f\u043e \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u044e \u0441 \u0444\u043e\u0440\u043c\u0430\u0442\u0430\u043c\u0438 Zstd \u0438 XZ \u0434\u0435\u043c\u043e\u043d\u0441\u0442\u0440\u0438\u0440\u0443\u044e\u0449\u0438\u0439 \u0431\u043e\u043b\u0435\u0435 \u0432\u044b\u0441\u043e\u043a\u0438\u0439 \u0443\u0440\u043e\u0432\u0435\u043d\u044c \u0441\u0436\u0430\u0442\u0438\u044f \u0438 \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c \u0440\u0430\u0431\u043e\u0442\u044b. OpenZL \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0430\u043d \u0434\u043b\u044f \u044d\u0444\u0444\u0435\u043a\u0442\u0438\u0432\u043d\u043e\u0433\u043e \u0441\u0436\u0430\u0442\u0438\u044f \u0441\u0442\u0440\u0443\u043a\u0442\u0443\u0440\u0438\u0440\u043e\u0432\u0430\u043d\u043d\u044b\u0445 \u043d\u0430\u0431\u043e\u0440\u043e\u0432 \u0434\u0430\u043d\u043d\u044b\u0445, \u043d\u0430\u043f\u0440\u0438\u043c\u0435\u0440, \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u043c\u044b\u0445 \u043f\u0440\u0438 \u043c\u0430\u0448\u0438\u043d\u043d\u043e\u043c \u043e\u0431\u0443\u0447\u0435\u043d\u0438\u0438, \u0430 \u0442\u0430\u043a\u0436\u0435 \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449, \u0441\u043e\u0434\u0435\u0440\u0436\u0430\u0449\u0438\u0445 \u043f\u043e\u043b\u044f \u0441 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u043c\u0438 \u043f\u043e\u0432\u0442\u043e\u0440\u044f\u044e\u0449\u0438\u043c\u0438\u0441\u044f \u0442\u0438\u043f\u0430\u043c\u0438 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438. \u041a\u043e\u0434 OpenZL \u043d\u0430\u043f\u0438\u0441\u0430\u043d \u043d\u0430 C\/C++ \u0438 \u043e\u0442\u043a\u0440\u044b\u0442 […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":144567,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-144566","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\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\udd47Syst\u00e9m kompresie OpenZL, ktor\u00fd pred\u010d\u00ed Zstd a XZ v r\u00fdchlosti a \u00farovni kompresie \u0161trukt\u00farovan\u00fdch \u00fadajov | ProHoster","description":"Spolo\u010dnos\u0165 Meta* 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