{"id":53906,"date":"2019-12-13T00:00:00","date_gmt":"2019-12-12T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/skorostnaya-otkazoustojchivaya-kompressiya-prodolzhenie"},"modified":"2020-02-18T14:01:51","modified_gmt":"2020-02-18T11:01:51","slug":"skorostnaya-otkazoustojchivaya-kompressiya-prodolzhenie","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/skorostnaya-otkazoustojchivaya-kompressiya-prodolzhenie","title":{"rendered":"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Kytyre kjo \u00ebsht\u00eb artikulli i dyt\u00eb n\u00eb tem\u00ebn e kompresionit t\u00eb shpejt\u00eb t\u00eb t\u00eb dh\u00ebnave. N\u00eb artikullin e par\u00eb u p\u00ebrshkrua nj\u00eb kompresor q\u00eb punon me shpejt\u00ebsin\u00eb 10GB\/sec. p\u00ebr \u00e7do b\u00ebrtham\u00eb procesori (kompresim minimal, RTT-Min). <\/p>\n<p>Ky kompresor \u00ebsht\u00eb tashm\u00eb i integruar n\u00eb pajisjet e duplikator\u00ebve kriminalistike p\u00ebr kompresionin me shpejt\u00ebsi t\u00eb skedar\u00ebve t\u00eb informacionit dhe rritjen e q\u00ebndrueshm\u00ebris\u00eb s\u00eb kriptografis\u00eb; gjithashtu mund t\u00eb p\u00ebrdoret p\u00ebr kompresionin e imazheve t\u00eb makinave virtuale dhe skedar\u00ebve swap t\u00eb memories gjat\u00eb ruajtjes s\u00eb tyre n\u00eb SSD t\u00eb shpejt\u00eb.<\/p>\n<p>N\u00eb artikullin e par\u00eb u njoftua gjithashtu zhvillimi i nj\u00eb algoritmi kompresimi p\u00ebr kompresionin e kopjeve rezerv\u00eb t\u00eb disqeve HDD dhe SSD (kompresim mesatar, RTT-Mid) me parametrat e p\u00ebrmir\u00ebsuara t\u00eb kompresionit t\u00eb t\u00eb dh\u00ebnave. Deri tani, ky kompresor \u00ebsht\u00eb plot\u00ebsisht i gatsh\u00ebm dhe ky artikull \u00ebsht\u00eb pik\u00ebrisht p\u00ebr t\u00eb. <br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nKompresori q\u00eb implementon algoritmin RTT-Mid ofron nj\u00eb shkall\u00eb kompresimi q\u00eb \u00ebsht\u00eb krahasuese me arkivuesit standard\u00eb si WinRar, 7-Zip, q\u00eb punojn\u00eb n\u00eb modalitetin e shpejt\u00eb. Nd\u00ebrkoh\u00eb, shpejt\u00ebsia e tij t\u00eb pakt\u00ebn \u00ebsht\u00eb nj\u00eb rend tjet\u00ebr m\u00eb e lart\u00eb. <\/p>\n<p>Shpejt\u00ebsia e paketimit dhe shpaketimit t\u00eb t\u00eb dh\u00ebnave \u00ebsht\u00eb nj\u00eb parametr kritik q\u00eb p\u00ebrcakton fush\u00ebn e aplikacionit t\u00eb teknologjive t\u00eb kompresimit. E v\u00ebshtir\u00eb se dikujt do t'i vie n\u00eb mendje t\u00eb kompresoj\u00eb nj\u00eb tera byte t\u00eb dh\u00ebna me shpejt\u00ebsi 10-15 MegaByte n\u00eb sekond\u00eb (kjo \u00ebsht\u00eb shpejt\u00ebsia e arkivuesve n\u00eb modin standard t\u00eb kompresimit), pasi do t\u00eb duhet t\u00eb kalojm\u00eb gati nj\u00ebzet or\u00eb me procesorin e ngarkuar plot\u00ebsisht...<\/p>\n<p>Nga ana tjet\u00ebr, \u00ebsht\u00eb e mundur t\u00eb kopjosh t\u00eb nj\u00ebjtin tera byte me shpejt\u00ebsi prej 2-3 GigaByte n\u00eb sekond\u00eb brenda dhjet\u00eb minutash. <\/p>\n<p>Prandaj, kompresimi i informacionit t\u00eb madh \u00ebsht\u00eb aktual n\u00ebse b\u00ebhet me nj\u00eb shpejt\u00ebsi jo m\u00eb t\u00eb ul\u00ebt se shpejt\u00ebsia reale e hyrje\/daljes. P\u00ebr sistemet moderne kjo \u00ebsht\u00eb t\u00eb pakt\u00ebn 100 MegaByte n\u00eb sekond\u00eb. <\/p>\n<p>K\u00ebto shpejt\u00ebsi kompjuterat modern\u00eb mund t'i arrijn\u00eb vet\u00ebm n\u00eb modalitetin \"fast\". Pra, n\u00eb k\u00ebt\u00eb modalitet aktual do t\u00eb krahasojm\u00eb algoritmin RTT-Mid me arkivuesit tradicional\u00eb.<\/p>\n<h4>Testimi krahasues i algoritmit t\u00eb ri t\u00eb kompresimit<\/h4>\n<p>\n Kompresori RTT-Mid punoi si pjes\u00eb e programit t\u00eb testimit. N\u00eb nj\u00eb aplikacion \"punues\" n\u00eb realitet, ai punon shum\u00eb m\u00eb shpejt, aty p\u00ebrdoret n\u00eb m\u00ebnyr\u00eb t\u00eb men\u00e7ur multithreading dhe aplikohet nj\u00eb p\u00ebrkthyes \"normal\", jo C#. <\/p>\n<p>Meqen\u00ebse kompresor\u00ebt e p\u00ebrdorur n\u00eb testin krahasues jan\u00eb nd\u00ebrtuar n\u00eb principe t\u00eb ndryshme dhe llojet e ndryshme t\u00eb t\u00eb dh\u00ebnave kompresohen ndryshe, p\u00ebr objektivitetin e testit u p\u00ebrdor nj\u00eb metod\u00eb matjeje \"temperatur\u00ebs mesatare n\u00eb spital\"\u2026<\/p>\n<p>U krijua nj\u00eb skedari i diskut logjik me sistemin operativ Windows 10, kjo \u00ebsht\u00eb p\u00ebrzierja m\u00eb natyrale e strukturave t\u00eb ndryshme t\u00eb t\u00eb dh\u00ebnave q\u00eb aktualisht ekziston n\u00eb \u00e7do kompjuter. Kompresimi i k\u00ebtij skedari do t\u00eb lejoj\u00eb krahasimin e shpejt\u00ebsis\u00eb dhe grad\u00ebs s\u00eb kompresimit t\u00eb algoritmit t\u00eb ri me kompresor\u00ebt m\u00eb t\u00eb avancuar t\u00eb p\u00ebrdorur n\u00eb arkivator\u00ebt modern\u00eb.<\/p>\n<p>Ky \u00ebsht\u00eb skedari i dump-it:<\/p>\n<p><img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/39fc5bfe9812ac2417d6eb8ef1dde0a8.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSkedari i dump-it u kompresua nga kompresor\u00ebt RTT-Mid, 7-zip, WinRar. Kompresori WinRar dhe 7-zip u vendos\u00ebn p\u00ebr maksimalin n\u00eb shpejt\u00ebsi t\u00eb pun\u00ebs.<\/p>\n<p>Kompresori po punon <b>7-zip<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/1b088a99fb7b04d5b6ccb500ff74c73e.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nAi ngarkon procesorin n\u00eb 100%, nd\u00ebrkoh\u00eb q\u00eb shpejt\u00ebsia mesatare e leximit t\u00eb dump-it origjinal \u00ebsht\u00eb rreth 60 Megabajt\/sekund.<\/p>\n<p>Kompresori po punon <b>WinRar<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/462024e8304a90a885ef3857fbd119e1.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSituata \u00ebsht\u00eb e ngjashme, ngarkesa e procesorit \u00ebsht\u00eb pothuaj 100%, shpejt\u00ebsia mesatare e leximit t\u00eb dump-it \u00ebsht\u00eb rreth 125 Megabajt\/sekund.<\/p>\n<p>Si n\u00eb rastin e m\u00ebparsh\u00ebm, shpejt\u00ebsia e pun\u00ebs s\u00eb arkivatorit \u00ebsht\u00eb e kufizuar nga mund\u00ebsit\u00eb e procesorit.<\/p>\n<p>Tani po punon programi testues i kompresorit <b>RTT-Mid<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/f46fabcbb362dcf99a8b55877954c3a8.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nScreenshot-i tregon se procesori \u00ebsht\u00eb ngarkuar n\u00eb 50% dhe \u00ebsht\u00eb n\u00eb pritje p\u00ebr pjes\u00ebn tjet\u00ebr t\u00eb koh\u00ebs, sepse nuk ka ku t\u00eb shkarkohet t\u00eb dh\u00ebnat e kompresuara. Disku i shkarkimit t\u00eb t\u00eb dh\u00ebnave (Disku 0) \u00ebsht\u00eb ngarkuar pothuajse plot\u00ebsisht. Shpejt\u00ebsia e p\u00ebrpunimit t\u00eb t\u00eb dh\u00ebnave (Disku 1) luhatet shum\u00eb, por n\u00eb mesatarisht \u00ebsht\u00eb mbi 200 Megabajt\/sekund.<\/p>\n<p>Shpejt\u00ebsia e pun\u00ebs s\u00eb kompresorit \u00ebsht\u00eb e kufizuar n\u00eb k\u00ebt\u00eb rast nga mund\u00ebsit\u00eb e shkruarjes s\u00eb t\u00eb dh\u00ebnave t\u00eb kompresuara n\u00eb Diskun 0.<\/p>\n<p>Tani shkalla e kompresimit t\u00eb arkivave t\u00eb fituara:<\/p>\n<p><img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/1e0740937909c6a5860ef35d15da9e7f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/6e74c8ceab741943a59eca87f092e25b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/3b2f8bed83ea72917f87a3a9813294fc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nE dukshme \u00ebsht\u00eb se kompresori RTT-Mid u p\u00ebrball me kompresimin m\u00eb mir\u00eb se t\u00eb tjer\u00ebt, arkivi i krijuar prej tij \u00ebsht\u00eb 1.3 Gigabajt m\u00eb i vog\u00ebl se arkivi WinRar dhe 2.1 Gigabajt m\u00eb i vog\u00ebl se arkivi 7z.<\/p>\n<p>Koha e shpenzuar p\u00ebr krijimin e arkivit:<\/p>\n<ul>\n<li> 7-zip \u2013 26 minuta 10 sekonda;<\/li>\n<li> WinRar \u2013 17 minuta 40 sekonda;<\/li>\n<li> RTT-Mid \u2013 7 minuta 30 sekonda.<\/li>\n<\/ul>\n<p>\nK\u00ebshtu, edhe programi testues, i pa optimizuar, duke p\u00ebrdorur algoritmin RTT-Mid, arriti t\u00eb krijoj\u00eb nj\u00eb arkiv m\u00eb shum\u00eb se dy her\u00eb e gjysm\u00eb m\u00eb shpejt, nd\u00ebrkoh\u00eb q\u00eb arkivi doli t\u00eb ishte ndjesh\u00ebm m\u00eb i vog\u00ebl se ai i konkurrent\u00ebve\u2026<\/p>\n<p>Ata q\u00eb nuk besojn\u00eb screenshot-et, mund t\u00eb verifikojn\u00eb sakt\u00ebsin\u00eb e tyre vet\u00eb. Programi testues \u00ebsht\u00eb i disponuesh\u00ebm n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/yadi.sk\/d\/9CkY30b1lRcLYw\">lidhjes<\/a><\/noindex>, shkarkoni dhe kontrolloni.<\/p>\n<p>Poros, vet\u00ebm n\u00eb procesor\u00ebt q\u00eb p\u00ebrkrahin AVX-2, pa mb\u00ebshtetje p\u00ebr k\u00ebto instruktime, kompaktori nuk funksionon, dhe mos e testoni algoritmin n\u00eb procesor\u00ebt e vjet\u00ebr AMD, ata jan\u00eb t\u00eb ngadalsh\u00ebm n\u00eb ekzekutimin e komandave AVX\u2026<\/p>\n<h4>Metoda e kompresimit t\u00eb p\u00ebrdorur<\/h4>\n<p>\nAlgoritmi p\u00ebrdor nj\u00eb metod\u00eb indeksimi t\u00eb fragmenteve t\u00eb p\u00ebrs\u00ebritura t\u00eb tekstit n\u00eb granula byte. Kjo metod\u00eb kompresimi \u00ebsht\u00eb e njohur prej nj\u00eb kohe t\u00eb gjat\u00eb, por nuk \u00ebsht\u00eb p\u00ebrdorur deri tani, pasi operacioni i k\u00ebrkimit t\u00eb p\u00ebrputhjeve ishte shum\u00eb i kushtuesh\u00ebm n\u00eb burimet e nevojshme dhe k\u00ebrkonte shum\u00eb m\u00eb shum\u00eb koh\u00eb sesa nd\u00ebrtimi i nj\u00eb fjalori. Pra, algoritmi RTT-Mid \u00ebsht\u00eb nj\u00eb shembull klasik i l\u00ebvizjes \"mbrapa n\u00eb t\u00eb ardhmen\"\u2026<\/p>\n<p>N\u00eb kompaktorin RTT p\u00ebrdoret nj\u00eb skaner unik i shpejt\u00eb p\u00ebr k\u00ebrkimin e p\u00ebrputhjeve, i cili mund\u00ebson p\u00ebrshpejtimin e procesit t\u00eb kompresimit. Skaneri i prodhimit t\u00eb vet, \u00ebsht\u00eb \"prerogativa ime\u2026\", \"\u00e7mimi i tij nuk \u00ebsht\u00eb i vog\u00ebl, pasi \u00ebsht\u00eb krejt manual\" (shkruar n\u00eb assembler).<\/p>\n<p>Skaneri i k\u00ebrkimit t\u00eb p\u00ebrputhjeve \u00ebsht\u00eb realizuar sipas nj\u00eb skeme probabiliste me dy nivele, fillimisht skanohet prania e \"shenj\u00ebs\" s\u00eb p\u00ebrshtatjes, dhe vet\u00ebm pas identifikimit t\u00eb \"shenj\u00ebs\" n\u00eb at\u00eb vend aktivizohet procedura e zbulimit t\u00eb p\u00ebrshtatjes reale. <\/p>\n<p>Dritarja e k\u00ebrkimit t\u00eb p\u00ebrputhjeve ka nj\u00eb madh\u00ebsi t\u00eb paparashikueshme, e cila varet nga niveli i entropis\u00eb n\u00eb bllokun e dh\u00ebnave q\u00eb po p\u00ebrpunohet. P\u00ebr t\u00eb dh\u00ebna krejt\u00ebsisht t\u00eb rast\u00ebsishme (t\u00eb pandjeshme), ajo ka madh\u00ebsi megabajt, p\u00ebr t\u00eb dh\u00ebnat q\u00eb kan\u00eb p\u00ebrs\u00ebritje gjithmon\u00eb ka nj\u00eb madh\u00ebsi mbi megabajt.<\/p>\n<p>Por shum\u00eb formate moderne t\u00eb t\u00eb dh\u00ebnave jan\u00eb t\u00eb pandjeshme dhe \"ta gjuajm\u00eb\" n\u00ebp\u00ebr to skanerin q\u00eb konsumon burime \u00ebsht\u00eb e kot\u00eb dhe e shpenzuar, prandaj skaneri p\u00ebrdor dy m\u00ebnyra operimi. Fillimisht k\u00ebrkohen segmente t\u00eb tekstit origjinal me p\u00ebrs\u00ebritje t\u00eb mundshme, ky operacion kryhet gjithashtu me nj\u00eb metod\u00eb probabiliste dhe ekzekutohet shum\u00eb shpejt (n\u00eb shpejt\u00ebsi prej 4-6 Gigabajt\/s). Pastaj segmentet me p\u00ebrputhje t\u00eb mundshme merren n\u00eb dor\u00eb nga skaneri kryesor. <\/p>\n<p>Kompresimi me indeks nuk \u00ebsht\u00eb shum\u00eb efikas, pasi duhet t\u00eb z\u00ebvend\u00ebsohen fragmentet e p\u00ebrs\u00ebritura me indekse, dhe masa e indekseve zvog\u00eblon ndjesh\u00ebm koeficientin e kompresimit. <\/p>\n<p>P\u00ebr t\u00eb rritur grad\u00ebn e kompresimit, jo vet\u00ebm p\u00ebrputhjet e plota t\u00eb vargjeve t\u00eb bajt\u00ebve indeksohen, por edhe ato t\u00eb pjesshme, kur n\u00eb varg ka bajt\u00eb t\u00eb p\u00ebrputhur dhe t\u00eb pap\u00ebrputhur. P\u00ebr k\u00ebt\u00eb, n\u00eb formatin e indeksit \u00ebsht\u00eb p\u00ebrfshir\u00eb nj\u00eb fush\u00eb mask\u00eb p\u00ebrshtatjesh q\u00eb tregon p\u00ebr bajt\u00ebt e p\u00ebrputhur t\u00eb dy blokjeve. P\u00ebr kompresim edhe m\u00eb t\u00eb madh, p\u00ebrdoret indeksimi me mbivendosje t\u00eb disa blloqeve t\u00eb pjessh\u00ebm t\u00eb p\u00ebrputhura n\u00eb bllokun aktual. <\/p>\n<p>T\u00eb gjitha k\u00ebto ndihmuan n\u00eb arritjen e nj\u00eb shkalle kompresimi n\u00eb kompresorin RTT-Mid, e cila \u00ebsht\u00eb e krahasueshme me kompresor\u00ebt e realizuar me metod\u00ebn e fjalorit, por punon shum\u00eb m\u00eb shpejt.<\/p>\n<h4>Shpejt\u00ebsia e pun\u00ebs s\u00eb algoritmit t\u00eb ri t\u00eb kompresimit<\/h4>\n<p>\nN\u00ebse kompresori punon me p\u00ebrdorim monopol t\u00eb memores cache (p\u00ebr nj\u00eb rrjedh\u00eb k\u00ebrkohen 4 MegaBajt), at\u00ebher\u00eb shpejt\u00ebsia e pun\u00ebs varion nga 700 n\u00eb 2000 MegaBajt\/sec. p\u00ebr \u00e7do b\u00ebrtham\u00eb procesori n\u00eb var\u00ebsi t\u00eb llojit t\u00eb t\u00eb dh\u00ebnave t\u00eb kompresuara dhe ka pak ndikim nga frekuenca e pun\u00ebs s\u00eb procesorit. <\/p>\n<p>N\u00eb realizimin me shum\u00eb rrjedha t\u00eb kompresorit, shkalla efektive e shkall\u00ebzimit p\u00ebrcaktohet nga sasia e memorjes cache t\u00eb nivelit t\u00eb tret\u00eb. P\u00ebr shembull, duke pasur \"n\u00eb bord\" 9 MegaBajt memorie cache nuk ka kuptim t\u00eb nisin m\u00eb shum\u00eb se dy rrjedha kompresimi, shpejt\u00ebsia nuk do t\u00eb rritet. Por me 20 MegaBajt cache, tashm\u00eb mund t\u00eb nisin pes\u00eb rrjedha kompresimi.<\/p>\n<p>Nj\u00eb paramet\u00ebr tjet\u00ebr i r\u00ebnd\u00ebsish\u00ebm q\u00eb p\u00ebrcakton shpejt\u00ebsin\u00eb e pun\u00ebs s\u00eb kompresorit \u00ebsht\u00eb vonesa e memores operative. Algoritmi p\u00ebrdor k\u00ebrkesa t\u00eb rast\u00ebsishme p\u00ebr n\u00ebnshkronje n\u00eb OP, nj\u00eb pjes\u00eb e t\u00eb cilave nuk arrin n\u00eb memorien cache (rreth 10%) dhe i duhet t\u00eb pres\u00eb p\u00ebr t\u00eb dh\u00ebnat nga OP, \u00e7ka e ul shpejt\u00ebsin\u00eb e pun\u00ebs. <\/p>\n<p>Shpejt\u00ebsin\u00eb e kompresorit e ndikon ndjesh\u00ebm edhe puna e sistemit t\u00eb hyrjes\/daljes s\u00eb t\u00eb dh\u00ebnave. K\u00ebrkesat p\u00ebr OP nga hyrja\/dalja bllokojn\u00eb k\u00ebrkesat p\u00ebr t\u00eb dh\u00ebna nga CP, \u00e7ka gjithashtu ul shpejt\u00ebsin\u00eb e kompresimit. Ky problem \u00ebsht\u00eb i r\u00ebnd\u00ebsish\u00ebm p\u00ebr laptop\u00ebt dhe desktop\u00ebt, p\u00ebr <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/server\/\"   title=\"servera\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1458\">servera<\/a> ai \u00ebsht\u00eb m\u00eb pak i r\u00ebnd\u00ebsish\u00ebm fal\u00eb nj\u00eb blloku m\u00eb t\u00eb avancuar t\u00eb menaxhimit t\u00eb aksesit n\u00eb shiritin sistemor dhe memores operative shum\u00ebkanal.<\/p>\n<p>Kudohe n\u00eb tekstin e artikullit flitet p\u00ebr kompresimin, dekompresimi mbetet jasht\u00eb k\u00ebsaj artikulli sepse aty \"gjith\u00e7ka \u00ebsht\u00eb n\u00eb rregull\". Dekompresimi kryhet duksh\u00ebm m\u00eb shpejt dhe kufizohet nga shpejt\u00ebsia e hyrjes\/daljes. Nj\u00eb b\u00ebrtham\u00eb fizike n\u00eb nj\u00eb rrjedh\u00eb siguron qet\u00ebsisht shpejt\u00ebsi ekstraktimi n\u00eb nivelin 3-4 Gigabajt\u00eb\/sekond\u00eb.<\/p>\n<p>Kjo \u00ebsht\u00eb e lidhur me munges\u00ebn n\u00eb procesin e ekstraktimit t\u00eb operacionit p\u00ebr k\u00ebrkimin e p\u00ebrputhjeve, i cili \"ha\" burimet kryesore t\u00eb procesorit dhe memorizimit gjat\u00eb kompresimit. <\/p>\n<h4>Besueshm\u00ebria e ruajtjes s\u00eb t\u00eb dh\u00ebnave t\u00eb kompresuara<\/h4>\n<p>\nSi\u00e7 tregohet nga emri i t\u00eb gjith\u00eb klas\u00ebs s\u00eb mjeteve softuerike q\u00eb p\u00ebrdorin kompresionin e t\u00eb dh\u00ebnave (arkivuesit), ato jan\u00eb t\u00eb destinuara p\u00ebr ruajtje afatgjat\u00eb t\u00eb informacionit, jo p\u00ebr vite, por p\u00ebr shekuj dhe mij\u00ebra vjet\u2026<\/p>\n<p>Gjat\u00eb ruajtjes, bart\u00ebsit e informacionit humbasin nj\u00eb pjes\u00eb t\u00eb t\u00eb dh\u00ebnave, ja nj\u00eb shembull:<\/p>\n<p><img decoding=\"async\" alt=\"Kompresimi i shpejt\u00eb dhe i q\u00ebndruesh\u00ebm (Vazhdimi)\" src=\"\/wp-content\/uploads\/2019\/12\/b85564e175204e70ed7c3c3ed0fbf008.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKy bart\u00ebs informacioni \"analogjik\" ka nj\u00eb mij\u00eb vjet, disa fragmente jan\u00eb humbur, por n\u00eb p\u00ebrgjith\u00ebsi informacioni \u00ebsht\u00eb \"i lexuesh\u00ebm\"\u2026<\/p>\n<p>Asnj\u00eb nga prodhuesit e p\u00ebrgjegjsh\u00ebm t\u00eb sistemeve moderne digjitale t\u00eb ruajtjes s\u00eb t\u00eb dh\u00ebnave dhe bart\u00ebsve digjital\u00eb nuk ofron garanci p\u00ebr ruajtjen e plot\u00eb t\u00eb t\u00eb dh\u00ebnave p\u00ebr m\u00eb shum\u00eb se 75 vjet.<br \/>\nDhe kjo \u00ebsht\u00eb nj\u00eb problem, por nj\u00eb problem i shtyr\u00eb, do ta zgjidhin pasardh\u00ebsit tan\u00eb...<\/p>\n<p>Sistemet e ruajtjes s\u00eb t\u00eb dh\u00ebnave digjitale mund t\u00eb humbasin t\u00eb dh\u00ebna jo vet\u00ebm pas 75 vjet\u00ebsh, gabimet n\u00eb t\u00eb dh\u00ebna mund t\u00eb shfaqen n\u00eb \u00e7do moment, madje edhe gjat\u00eb regjistrimit t\u00eb tyre, k\u00ebto devijime p\u00ebrpiqen t\u00eb minimizohen duke p\u00ebrdorur tepric\u00ebn dhe duke korrigjuar me sistemet e korrigjimit t\u00eb gabimeve. Teprica dhe sistemet e korrigjimit nuk mund t\u00eb rikthejn\u00eb informacionin e humbur gjithmon\u00eb, dhe n\u00ebse e b\u00ebjn\u00eb, nuk ka garanci q\u00eb operacioni i rikthimit kaloi si\u00e7 duhet.<\/p>\n<p>Dhe kjo \u00ebsht\u00eb gjithashtu nj\u00eb problem i madh, por jo i shtyr\u00eb, por aktual.<\/p>\n<p>Kompresor\u00ebt modern\u00eb t\u00eb p\u00ebrdorur p\u00ebr arkivimin e t\u00eb dh\u00ebnave digjitale jan\u00eb nd\u00ebrtuar mbi modifikime t\u00eb metod\u00ebs s\u00eb fjalorit dhe p\u00ebr k\u00ebto arkiva, humbja e nj\u00eb fragmenti informacioni do t\u00eb jet\u00eb nj\u00eb ngjarje fatale, madje ekziston nj\u00eb term i vendosur p\u00ebr nj\u00eb situat\u00eb t\u00eb till\u00eb \u2014 \"arkiv i d\u00ebmtuar\"...<\/p>\n<p>P\u00ebrfshirja e informacionit t\u00eb ul\u00ebt n\u00eb arkivat me kompresim fjal\u00eb p\u00ebr fjal\u00eb lidhet me struktur\u00ebn e t\u00eb dh\u00ebnave t\u00eb kompresuara. Informacioni n\u00eb nj\u00eb arkiv t\u00eb till\u00eb nuk p\u00ebrmban tekstin origjinal, aty ruhen numrat e regjistrimeve n\u00eb fjalor, nd\u00ebrsa fjalori vet\u00eb modifikohet dinamikisht nga teksti aktual n\u00eb kompresim. N\u00eb rast se humbet ose keqinterpretohet nj\u00eb fraksion i arkiv\u00ebs, t\u00eb gjitha regjistrimet e m\u00ebvonshme n\u00eb arkiv nuk mund t\u00eb identifikohen as nga p\u00ebrmbajtja, as nga gjat\u00ebsia e regjistrimit n\u00eb fjalor, pasi nuk \u00ebsht\u00eb e qart\u00eb se \u00e7far\u00eb i p\u00ebrgjigjet numrit t\u00eb regjistrimit n\u00eb fjalor.<\/p>\n<p>P\u00ebr t\u00eb rikuperuar informacionin nga nj\u00eb arkiv t\u00eb till\u00eb \"t\u00eb prishur\" \u00ebsht\u00eb e pamundur.<\/p>\n<p>Algoritmi RTT \u00ebsht\u00eb nd\u00ebrtuar mbi nj\u00eb metod\u00eb m\u00eb t\u00eb besueshme t\u00eb ruajtjes s\u00eb t\u00eb dh\u00ebnave t\u00eb kompresuara. N\u00eb t\u00eb aplikohet metoda indeksuese p\u00ebr t\u00eb mbajtur mend fragmentet e p\u00ebrs\u00ebritura. Kjo qasje p\u00ebr kompresionin lejon minimizimin e pasojave t\u00eb keqinterpretimit t\u00eb informacionit n\u00eb mbajt\u00ebs, dhe n\u00eb shum\u00eb raste automatikisht korrigjon keqinterpretimet q\u00eb kan\u00eb ndodhur gjat\u00eb ruajtjes s\u00eb informacionit.<br \/>\nKjo lidhet me faktin se skedari arkivor, n\u00eb rastin e kompresimit me indeks, p\u00ebrmban dy fusha:<\/p>\n<ul>\n<li>fusha e tekstit origjinal me pjes\u00ebt e p\u00ebrs\u00ebritura t\u00eb hequra nga t\u00eb;\u201d<\/li>\n<li>fusha e indekseve. <\/li>\n<\/ul>\n<p>\nFusha e indekseve \u00ebsht\u00eb kritike p\u00ebr rikuperimin e informacionit, nuk \u00ebsht\u00eb e madhe n\u00eb madh\u00ebsi dhe mund t\u00eb dyfishohet p\u00ebr sigurin\u00eb e ruajtjes s\u00eb t\u00eb dh\u00ebnave. Prandaj, edhe n\u00ebse humbet nj\u00eb fraksion i tekstit origjinal ose i mas\u00ebs s\u00eb indekseve, e gjith\u00eb informacioni tjet\u00ebr do t\u00eb rikuperohet pa probleme, si n\u00eb imazhin me mbajt\u00ebsin e informacionit \"analog\".<\/p>\n<h4>Mang\u00ebsit\u00eb e algoritmit<\/h4>\n<p>\nNuk ka merita pa mang\u00ebsi. Metoda indeksuese e kompresionit nuk kompreson sekuenca p\u00ebrs\u00ebrit\u00ebse me gjat\u00ebsi t\u00eb vog\u00ebl. Kjo lidhet me kufizimet e metod\u00ebs indeksuese. Indekset kan\u00eb madh\u00ebsi jo m\u00eb pak se 3 byte dhe mund t\u00eb jen\u00eb deri n\u00eb 12 byte. N\u00ebse shfaqet nj\u00eb p\u00ebrs\u00ebritje me nj\u00eb madh\u00ebsi m\u00eb t\u00eb vog\u00ebl se ajo q\u00eb p\u00ebrshkruan indeksi, at\u00ebher\u00eb ajo nuk llogaritet, pavar\u00ebsisht se sa shpesh shfaqen ato p\u00ebrs\u00ebritje n\u00eb skedarin n\u00eb kompresim.<\/p>\n<p>Metoda tradicionale, e bazuar n\u00eb fjalor, kompreson shum\u00eb p\u00ebrs\u00ebritje t\u00eb shkurtra n\u00eb m\u00ebnyr\u00eb efektive dhe, p\u00ebr k\u00ebt\u00eb arsye, arrin nj\u00eb koeficient m\u00eb t\u00eb lart\u00eb kompresimi sesa kompresimi indekseve. E v\u00ebrteta \u00ebsht\u00eb se kjo arrihet p\u00ebrmes nj\u00eb ngarkese t\u00eb lart\u00eb t\u00eb procesorit qendror, sepse p\u00ebr t\u00eb filluar kompresimin e t\u00eb dh\u00ebnave m\u00eb efektivisht se metoda e indekseve, i duhet t\u00eb ul\u00eb shpejt\u00ebsin\u00eb e procesimit t\u00eb t\u00eb dh\u00ebnave deri n\u00eb 10-20 megabajt n\u00eb sekond\u00eb n\u00eb instalime reale t\u00eb kompjuter\u00ebve gjat\u00eb ngarkes\u00ebs maksimale t\u00eb CPU-s\u00eb.<\/p>\n<p>K\u00ebto shpejt\u00ebsi t\u00eb ul\u00ebta jan\u00eb t\u00eb papranueshme p\u00ebr sistemet moderne t\u00eb ruajtjes s\u00eb t\u00eb dh\u00ebnave dhe p\u00ebrb\u00ebjn\u00eb m\u00eb shum\u00eb nj\u00eb interes \u00abakademik\u00bb sesa praktik.<\/p>\n<p>Niveli i kompresimit t\u00eb informacionit do t\u00eb rritet ndjesh\u00ebm n\u00eb modifikimin e ardhsh\u00ebm t\u00eb algoritmit RTT (RTT-Max), i cili \u00ebsht\u00eb duke u zhvilluar.<\/p>\n<p>Pra, si gjithmon\u00eb, vazhdimi ndjek...<br \/>\n<br \/>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/479888\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0414\u0430\u043d\u043d\u0430\u044f \u0441\u0442\u0430\u0442\u044c\u044f \u0443\u0436\u0435 \u0432\u0442\u043e\u0440\u0430\u044f \u0432 \u0442\u0435\u043c\u0435 \u043e \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u043e\u0439 \u043a\u043e\u043c\u043f\u0440\u0435\u0441\u0441\u0438\u0438 \u0434\u0430\u043d\u043d\u044b\u0445. \u0412 \u043f\u0435\u0440\u0432\u043e\u0439 \u0441\u0442\u0430\u0442\u044c\u0435 \u0431\u044b\u043b \u043e\u043f\u0438\u0441\u0430\u043d \u043a\u043e\u043c\u043f\u0440\u0435\u0441\u0441\u043e\u0440 \u0440\u0430\u0431\u043e\u0442\u0430\u044e\u0449\u0438\u0439 \u0441\u043e \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u044c\u044e 10\u0413\u0431\u0430\u0439\u0442\/\u0441\u0435\u043a. \u043d\u0430 \u043e\u0434\u043d\u043e \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u043d\u043e\u0435 \u044f\u0434\u0440\u043e (\u043c\u0438\u043d\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0435 \u0441\u0436\u0430\u0442\u0438\u0435, RTT-Min). \u042d\u0442\u043e\u0442 \u043a\u043e\u043c\u043f\u0440\u0435\u0441\u0441\u043e\u0440, \u0443\u0436\u0435 \u0432\u043d\u0435\u0434\u0440\u0435\u043d \u0432 \u043e\u0431\u043e\u0440\u0443\u0434\u043e\u0432\u0430\u043d\u0438\u0435 \u043a\u0440\u0438\u043c\u0438\u043d\u0430\u043b\u0438\u0441\u0442\u0438\u0447\u0435\u0441\u043a\u0438\u0445 \u0434\u0443\u0431\u043b\u0438\u043a\u0430\u0442\u043e\u0440\u043e\u0432 \u0434\u043b\u044f \u0441\u043a\u043e\u0440\u043e\u0441\u0442\u043d\u043e\u0433\u043e \u0441\u0436\u0430\u0442\u0438\u044f \u0434\u0430\u043c\u043f\u043e\u0432 \u043d\u043e\u0441\u0438\u0442\u0435\u043b\u0435\u0439 \u0438\u043d\u0444\u043e\u0440\u043c\u0430\u0446\u0438\u0438 \u0438 \u0443\u0441\u0438\u043b\u0435\u043d\u0438\u044f \u0441\u0442\u043e\u0439\u043a\u043e\u0441\u0442\u0438 \u043a\u0440\u0438\u043f\u0442\u043e\u0433\u0440\u0430\u0444\u0438\u0438, \u0442\u0430\u043a\u0436\u0435 \u043e\u043d \u043c\u043e\u0436\u0435\u0442 \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0442\u044c\u0441\u044f \u0434\u043b\u044f \u0441\u0436\u0430\u0442\u0438\u044f \u043e\u0431\u0440\u0430\u0437\u043e\u0432 \u0432\u0438\u0440\u0442\u0443\u0430\u043b\u044c\u043d\u044b\u0445 \u043c\u0430\u0448\u0438\u043d \u0438 [&hellip;]<\/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":[688],"tags":[],"class_list":["post-53906","post","type-post","status-publish","format-standard","hentry","category-administrirovanie"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - 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