{"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\/da\/blog\/news\/sistema-szhatiya-openzl-operezhayushhaya-zstd-i-xz-po-skorosti-i-urovnyu-szhatiya-strukturirovannyh-dannyh","title":{"rendered":"OpenZL komprimeringssystemet, der overg\u00e5r Zstd og XZ med hensyn til hastighed og komprimering af strukturerede data","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Meta* har pr\u00e6senteret et v\u00e6rkt\u00f8j til komprimering og dekomprimering af data kaldet OpenZL, som i forhold til formaterne Zstd og XZ viser et h\u00f8jere niveau af kompression og hastighed. OpenZL er designet til effektiv komprimering af strukturerede datas\u00e6t, s\u00e5som dem der anvendes i maskinl\u00e6ring, samt opbevaringssystemer, der indeholder felter med forskellige gentagne typer information. Koden til OpenZL er skrevet i C\/C++ og er open source under BSD-licensen. <\/p>\n

Ved komprimering af databasen med det astronomiske stjernekatalog SAO, form\u00e5ede OpenZL v\u00e6rkt\u00f8jet at reducere datast\u00f8rrelsen med 2,06 gange, mens zstd-algoritmen komprimerede informationen med 1,31 gange, og XZ med 1,64 gange. Hvad hastighed ang\u00e5r, overhalede OpenZL zstd med det dobbelte (203 MB\/s mod 115 MB\/s), og XZ med 65 gange (203 MB\/s mod 3,1 MB\/s). Udpakningen i OpenZL viste sig at v\u00e6re en smule langsommere end zstd (822 MB\/s mod 890 MB\/s) og 27 gange hurtigere end XZ.

\"OpenZL<\/center> <\/p>\n

OpenZL er ikke en generel algoritme og viser kun gode resultater for data med en forudkendt struktur. OpenZLs funktionalitet best\u00e5r i adaptiv generering af en kompressor baseret p\u00e5 den leverede databeskrivelse. Resultatet er en komprimeringskode, der er optimeret til et specifikt dataformat. Til dekomprimering anvendes en universel dekompressor, der er kompatibel med alle genererede kompressorer. <\/p>\n

Pakning og udpakning udf\u00f8res ved hj\u00e6lp af det ene v\u00e6rkt\u00f8j \u00abzli\u00bb eller biblioteket libopenzl. Datastrukturen beskrives i form af profiler. Der er allerede en samling foruddefinerede profiler, der beskriver typiske lagringsformater. For eksempel en profil til CSV-formatet eller data gemt i form af et array af 64-bit tal. Komprimering reduceres til at v\u00e6lge en profil med kommandoen \u00abzli list-profiles\u00bb og starte pakkeprocessen med kommandoen \u00abzli compress \u2014profile profil_navn\u00bb. For at udpakke er det tilstr\u00e6kkeligt at starte \u00abzli decompress\u00bb. <\/p>\n

For specifikke formater er det n\u00f8dvendigt at danne en egen profil ved at bruge kommandoen \u00abzli train\u00bb, som identificerer m\u00f8nstre i dataene og danner en profil med det optimale komprimeringsniveau. Ved at bruge indstillingen \u00ab--pareto-frontier\u00bb kan den oprettede profil opgraderes mod hurtigere pakning eller udpakning, p\u00e5 bekostning af et fald i komprimeringsniveauet. Til beskrivelse af komplekse formater med indlejrede strukturer og til bestemmelse af layoutet af dataformater i strukturer kan SDDL (Simple Data Description Language) anvendes. <\/p>\n

Metoden til at skabe optimale pakkere er baseret p\u00e5 anvendelsen af et s\u00e6t prim\u00e6re kodere, hvoraf hver enkelt er mest effektiv til specifikke typer og sekvenser af data. Til komprimering dannes der en retningsbestemt acyklisk graf over databehandling, hvor noderne er codecs, og kanterne er dataalternativer i det behandlede format. Afh\u00e6ngigt af typen af inputdata v\u00e6lges en k\u00e6de af codecs, der optimalt komprimerer den indkomne datakomponent. I en s\u00e5dan organisation komprimeres filens header af \u00e9n codec, feltet med heltal af en anden, feltet med et stigende t\u00e6ller af en tredje, og feltet med strengdata af en fjerde.

\"OpenZL<\/center>
\n
Kilde: 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\udd47The OpenZL compression system outperforms Zstd and XZ in speed and compression levels of structured data | ProHoster","description":"The company Meta* has introduced the OpenZL compression and decompression 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