{"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":"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Ky artikulli \u00ebsht\u00eb i dyti 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\u00ebsi 10GB\/s p\u00ebr \u00e7do b\u00ebrtham\u00eb procesori (kompresim minimal, RTT-Min). <\/p>\n<p>Ky kompresor \u00ebsht\u00eb tashm\u00eb i implementuar n\u00eb pajisjet e dubluesve kriminalistik\u00eb p\u00ebr kompresionin me shpejt\u00ebsi t\u00eb kopjeve t\u00eb mediave t\u00eb informacionit dhe p\u00ebrforcimin e q\u00ebndrueshm\u00ebris\u00eb s\u00eb kriptografis\u00eb, gjithashtu ai mund t\u00eb p\u00ebrdoret p\u00ebr kompresionin e imazheve t\u00eb makinave virtuale dhe skedar\u00ebve swap t\u00eb memorjes RAM gjat\u00eb ruajtjes s\u00eb tyre n\u00eb disqe SSD me shpejt\u00ebsi t\u00eb lart\u00eb.<\/p>\n<p>N\u00eb artikullin e par\u00eb gjithashtu u njoftua zhvillimi i nj\u00eb algoritmi kompresioni p\u00ebr kompresionin e kopjeve rezerv\u00eb t\u00eb HDD dhe SSD (kompresim mesatar, RTT-Mid) me parametra t\u00eb p\u00ebrmir\u00ebsuar ndjesh\u00ebm p\u00ebr kompresionin e t\u00eb dh\u00ebnave. Deri n\u00eb k\u00ebt\u00eb moment, 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 siguron nj\u00eb shkall\u00eb kompresimi krahasuese me arkivuesit standard\u00eb si WinRar, 7-Zip, q\u00eb punojn\u00eb n\u00eb modin e shpejt\u00eb. Nd\u00ebrkoh\u00eb, shpejt\u00ebsia e tij \u00ebsht\u00eb t\u00eb pakt\u00ebn nj\u00eb rend m\u00eb e lart\u00eb. <\/p>\n<p>Shpejt\u00ebsia e paketimit\/demonstrimit t\u00eb t\u00eb dh\u00ebnave \u00ebsht\u00eb nj\u00eb parametrik kritik q\u00eb p\u00ebrcakton fush\u00ebn e aplikimit t\u00eb teknologjive t\u00eb kompresionit. V\u00ebshtir\u00eb se ndokujt do t'i vije n\u00eb mendje t\u00eb kompresoj\u00eb nj\u00eb terabajt t\u00eb dh\u00ebnash me shpejt\u00ebsi 10-15 Megabajt n\u00eb sekond\u00eb (kjo \u00ebsht\u00eb shpejt\u00ebsia e arkivuesve n\u00eb modalitetin standard t\u00eb kompresionit), sepse do t\u00eb duhen pothuajse nj\u00ebzet or\u00eb me ngarkes\u00eb t\u00eb plot\u00eb t\u00eb procesorit...<\/p>\n<p>Nga ana tjet\u00ebr, t\u00eb nj\u00ebjtin terabajt mund ta kopjojm\u00eb me shpejt\u00ebsi rreth 2-3 Gigabajt n\u00eb sekond\u00eb p\u00ebr rreth dhjet\u00eb minuta. <\/p>\n<p>Prandaj, kompresimi i informacionit me volum t\u00eb madh \u00ebsht\u00eb i r\u00ebnd\u00ebsish\u00ebm n\u00ebse realizohet me shpejt\u00ebsi jo m\u00eb t\u00eb ul\u00ebt se shpejt\u00ebsia e v\u00ebrtet\u00eb e hyrjes\/jeshjes. P\u00ebr sistemet moderne, kjo \u00ebsht\u00eb t\u00eb pakt\u00ebn 100 Megabajt n\u00eb sekond\u00eb. <\/p>\n<p>K\u00ebto shpejt\u00ebsi kompjuter\u00ebt modern\u00eb mund t'i ofrojn\u00eb vet\u00ebm n\u00eb modus \u00abfast\u00bb. Pra, n\u00eb k\u00ebt\u00eb modus aktual do t\u00eb b\u00ebjm\u00eb krahasimin e algoritmit RTT-Mid me arkivuesit tradicional\u00eb.<\/p>\n<h4>Testimi krahasues i algoritmit t\u00eb ri t\u00eb kompresionit<\/h4>\n<p>\n Kompresori RTT-Mid punoi si pjes\u00eb e nj\u00eb programi testimi. N\u00eb aplikacionin e v\u00ebrtet\u00eb \u00abt\u00eb pun\u00ebs\u00bb ai punon n\u00eb m\u00ebnyr\u00eb duksh\u00ebm m\u00eb shpejt, duke shfryt\u00ebzuar n\u00eb m\u00ebnyr\u00eb t\u00eb p\u00ebrshtatshme shum\u00ebputhshm\u00ebrin\u00eb dhe duke p\u00ebrdorur nj\u00eb kompilator \u00abnormal\u00bb, e jo C#. <\/p>\n<p>Duke p\u00ebrdoren kompresor\u00eb t\u00eb ndrysh\u00ebm n\u00eb testin e krahasimit dhe lloje t\u00eb ndryshme t\u00eb t\u00eb dh\u00ebnave kompresohen ndryshe, p\u00ebr objektivitetin e testit u p\u00ebrdor metoda e matjes \"temperatur\u00ebs mesatare n\u00eb spital\"...<\/p>\n<p>U krijua nj\u00eb skedar i dump-it sektor p\u00ebr sektor t\u00eb 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 ndodhen n\u00eb \u00e7do kompjuter. Kompresimi i k\u00ebtij skedari do t\u00eb lejoj\u00eb krahasimin e shpejt\u00ebsis\u00eb dhe shkall\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>Ja ky skedar dump-i:<\/p>\n<p><img decoding=\"async\" alt=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" src=\"\/wp-content\/uploads\/2019\/12\/39fc5bfe9812ac2417d6eb8ef1dde0a8.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nSkedari dump u kompresua me kompresor\u00ebt RTT-Mid, 7-zip, WinRar. Kompresori WinRar dhe 7-zip u vendos\u00ebn n\u00eb shpejt\u00ebsin\u00eb maksimale t\u00eb pun\u00ebs.<\/p>\n<p>Kompresori po punon <b>7-zip<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" 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 MegaByte\/sec.<\/p>\n<p>Kompresori po punon <b>WinRar<\/b>:<\/p>\n<p><img decoding=\"async\" alt=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" 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 praktikisht 100%, shpejt\u00ebsia mesatare e leximit t\u00eb dump-it \u00ebsht\u00eb rreth 125 MegaByte\/sec.<\/p>\n<p>Ashtu 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=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" 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 i papun\u00eb pjes\u00ebn tjet\u00ebr t\u00eb koh\u00ebs, sepse nuk ka ku t\u00eb shkarkohen t\u00eb dh\u00ebnat e kompresuara. Disku i shkarkimit t\u00eb t\u00eb dh\u00ebnave (Disku 0) \u00ebsht\u00eb ngarkuar praktikisht plot\u00ebsisht. Shpejt\u00ebsia e leximit t\u00eb t\u00eb dh\u00ebnave (Disku 1) hipet ndjesh\u00ebm, por mesatarisht m\u00eb shum\u00eb se 200 MegaByte\/sec.<\/p>\n<p>Shpejt\u00ebsia e pun\u00ebs s\u00eb kompresorit \u00ebsht\u00eb n\u00eb k\u00ebt\u00eb rast e kufizuar nga mund\u00ebsit\u00eb e shkarkimit t\u00eb t\u00eb dh\u00ebnave t\u00eb kompresuara n\u00eb Diskun 0.<\/p>\n<p>Tani shkalla e kompresimit t\u00eb arkivave t\u00eb marra:<\/p>\n<p><img decoding=\"async\" alt=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" src=\"\/wp-content\/uploads\/2019\/12\/1e0740937909c6a5860ef35d15da9e7f.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" src=\"\/wp-content\/uploads\/2019\/12\/6e74c8ceab741943a59eca87f092e25b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" src=\"\/wp-content\/uploads\/2019\/12\/3b2f8bed83ea72917f87a3a9813294fc.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nDuket se kompresori RTT-Mid ia doli m\u00eb mir\u00eb se t\u00eb tjer\u00ebt n\u00eb kompresion, arkivi i krijuar prej tij \u00ebsht\u00eb 1.3 GigaByte m\u00eb i vog\u00ebl se arkivi WinRar dhe 2.1 GigaByte 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>\nPra, madje edhe programi testues, i pa optimizuar, duke p\u00ebrdorur algoritmin RTT-Mid, arriti t\u00eb krijonte arkivin m\u00eb shum\u00eb se dyfish m\u00eb shpejt, nd\u00ebrkoh\u00eb q\u00eb arkivi doli t\u00eb ishte ndjesh\u00ebm m\u00eb i vog\u00ebl se ai i konkurent\u00ebve...<\/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 n\u00eb dispozicion n\u00eb <noindex><a rel=\"nofollow\" href=\"https:\/\/yadi.sk\/d\/9CkY30b1lRcLYw\">linkun<\/a><\/noindex>, shkarko dhe kontrollo.<\/p>\n<p>Por vet\u00ebm n\u00eb procesor\u00ebt me mb\u00ebshtetje AVX-2, pa mb\u00ebshtetje p\u00ebr k\u00ebto instrukcione, kompresori 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 p\u00ebrdorur p\u00ebr kompresimin<\/h4>\n<p>\nAlgoritmi p\u00ebrdor metod\u00ebn e indeksimit t\u00eb fragmenteve t\u00eb p\u00ebrs\u00ebritura t\u00eb tekstit n\u00eb granularity byte. Kjo metod\u00eb kompresimi \u00ebsht\u00eb e njohur prej koh\u00ebsh, por nuk \u00ebsht\u00eb p\u00ebrdorur, pasi operacioni i k\u00ebrkimit t\u00eb p\u00ebrputhjeve ishte shum\u00eb i shtrenjt\u00eb n\u00eb burime dhe k\u00ebrkonte m\u00eb shum\u00eb koh\u00eb se 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 kompresorin RTT p\u00ebrdoret nj\u00eb skaner unik p\u00ebr k\u00ebrkimin e p\u00ebrputhjeve, i cili lejon t\u00eb p\u00ebrshpejtoj\u00eb procesin e kompresimit. Skaneri \u00ebsht\u00eb prodhim i vet\u00eb, \u00ebsht\u00eb \"k\u00ebnaq\u00ebsia ime...\", \"ka nj\u00eb \u00e7mim t\u00eb konsideruesh\u00ebm, sepse \u00ebsht\u00eb krejt\u00ebsisht i punuar me dor\u00eb\" (\u00ebsht\u00eb shkruar n\u00eb assembler).<\/p>\n<p>Skaneri p\u00ebr k\u00ebrkimin e p\u00ebrputhjeve \u00ebsht\u00eb realizuar sipas nj\u00eb skeme probabilistike me dy nivele, fillimisht skanohet prania e \"shenj\u00ebs\" s\u00eb p\u00ebrputhjes, dhe vet\u00ebm pas identifikimit t\u00eb \"shenj\u00ebs\" n\u00eb k\u00ebt\u00eb vend, fillon procedura e zbuluar t\u00eb p\u00ebrputhjes reale. <\/p>\n<p>Deri n\u00eb dritaren 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 t\u00eb dh\u00ebnave q\u00eb po p\u00ebrpunohet. P\u00ebr t\u00eb dh\u00ebnat krejt\u00ebsisht t\u00eb rast\u00ebsishme (t\u00eb pa kompresueshme) 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 m\u00eb t\u00eb madhe se megabajti.<\/p>\n<p>Por shum\u00eb formate moderne t\u00eb t\u00eb dh\u00ebnave jan\u00eb t\u00eb pa kompresueshme dhe \"t\u00eb kesh\" nj\u00eb skaner t\u00eb k\u00ebrkimit t\u00eb r\u00ebnd\u00eb mbi to \u00ebsht\u00eb e kot\u00eb dhe shp\u00ebrdoruese, prandaj skaneri p\u00ebrdor dy m\u00ebnyra funksionimi. Fillimisht k\u00ebrkohen pjes\u00ebt e tekstit fillestar me mund\u00ebsi p\u00ebrs\u00ebritjeje, ky operacion kryhet po ashtu me nj\u00eb metod\u00eb probabilistike dhe realizohet shum\u00eb shpejt (me shpejt\u00ebsi 4-6 GigaBajt\/s). Pastaj, pjes\u00ebt me mund\u00ebsi p\u00ebrputhjeje trajtohen nga skaneri kryesor. <\/p>\n<p>Kompresimi indeksor nuk \u00ebsht\u00eb shum\u00eb efikas, duhet t\u00eb z\u00ebvend\u00ebsohen fragmentet e p\u00ebrs\u00ebritura me indekse, dhe matrica indeksore zvog\u00eblon duksh\u00ebm koeficientin e kompresimit. <\/p>\n<p>P\u00ebr t\u00eb rritur shkall\u00ebn e kompresimit, indeksohen jo vet\u00ebm p\u00ebrputhjet e plota t\u00eb zinxhir\u00ebve t\u00eb bajtave, por edhe ato t\u00eb pjesshme, kur n\u00eb zinxhir ka bajta q\u00eb p\u00ebrputhen dhe nuk p\u00ebrputhen. P\u00ebr k\u00ebt\u00eb, n\u00eb formatin e indeksit \u00ebsht\u00eb p\u00ebrfshir\u00eb nj\u00eb fush\u00eb mask\u00eb p\u00ebrputhjesh q\u00eb tregon p\u00ebr bajtat e p\u00ebrputhura t\u00eb dy blok\u00ebve. P\u00ebr nj\u00eb kompresim edhe m\u00eb t\u00eb madh, p\u00ebrdoret indeksimi me mbivendosje t\u00eb disa bllok\u00ebve q\u00eb p\u00ebrputhen pjes\u00ebrisht me blokun aktual. <\/p>\n<p>T\u00eb gjitha k\u00ebto lejuan q\u00eb kompresori RTT-Mid t\u00eb arrij\u00eb nj\u00eb shkall\u00eb kompresimi t\u00eb krahasueshme me kompresor\u00ebt q\u00eb funksionojn\u00eb me metod\u00ebn e fjalorit, por q\u00eb punon shum\u00eb m\u00eb shpejt.<\/p>\n<h4>Shkalla 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 memorjes cache (p\u00ebr nj\u00eb rrjedh\u00eb k\u00ebrkohet 4 MegaByte), shpejt\u00ebsia e pun\u00ebs luhatet n\u00eb \u0434\u0438\u0430\u043f\u0430\u0437\u043e\u043din 700-2000 MegaByte\/s n\u00eb nj\u00eb b\u00ebrtham\u00eb procesori n\u00eb var\u00ebsi t\u00eb llojit t\u00eb t\u00eb dh\u00ebnave q\u00eb kompresohen dhe pak varion nga frekuenca e pun\u00ebs s\u00eb procesorit. <\/p>\n<p>N\u00eb realizimin shum\u00ebfrymor t\u00eb kompresorit, shkall\u00ebzimi efektiv p\u00ebrcaktohet nga v\u00ebllimi i memorjes cache t\u00eb nivelit t\u00eb tret\u00eb. P\u00ebr shembull, duke pasur \u00abn\u00eb bord\u00bb 9 MegaByte memorje cache, nuk ka kuptim t\u00eb nisni m\u00eb shum\u00eb se dy rrjedha kompresimi, shpejt\u00ebsia nuk do t\u00eb rritet nga kjo. Por me cache prej 20 MegaByte, tashm\u00eb mund t\u00eb nisni pes\u00eb rrjedha kompresimi.<\/p>\n<p>Gjithashtu, nj\u00eb parametr tjet\u00ebr t\u00eb r\u00ebnd\u00ebsish\u00ebm q\u00eb p\u00ebrcakton shpejt\u00ebsin\u00eb e pun\u00ebs s\u00eb kompresorit \u00ebsht\u00eb latenca e memorjes operative. Algoritmi p\u00ebrdor k\u00ebrkesa rast\u00ebsore p\u00ebr t\u00eb dh\u00ebnat, nj\u00eb pjes\u00eb e t\u00eb cilave nuk kapin memorjen cache (rreth 10%) dhe ai duhet t\u00eb pres\u00eb p\u00ebr t\u00eb dh\u00ebnat nga memorja operative, gj\u00eb q\u00eb zvog\u00eblon shpejt\u00ebsin\u00eb e pun\u00ebs. <\/p>\n<p>Shpejt\u00ebsin\u00eb e kompresorit e ndikon gjithashtu puna e sistemit t\u00eb hyrjes\/daljes s\u00eb t\u00eb dh\u00ebnave. K\u00ebrkesat p\u00ebr t\u00eb dh\u00ebna nga hyrja\/dalja bllokojn\u00eb k\u00ebrkesat p\u00ebr t\u00eb dh\u00ebnat nga CPU, gj\u00eb q\u00eb gjithashtu zvog\u00eblon shpejt\u00ebsin\u00eb e kompresimit. Ky problem \u00ebsht\u00eb i r\u00ebnd\u00ebsish\u00ebm p\u00ebr laptop\u00ebt dhe desktop\u00ebt, <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/server\/\"   title=\"server\u00ebsh\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"1458\">server\u00ebsh<\/a> ai \u00ebsht\u00eb m\u00eb pak i r\u00ebnd\u00ebsish\u00ebm fal\u00eb nj\u00eb bloku m\u00eb t\u00eb avancuar t\u00eb menaxhimit t\u00eb aksesit n\u00eb autobusin sistemor dhe memorjes operative me shum\u00eb kanale.<\/p>\n<p>N\u00eb t\u00eb gjith\u00eb tekstin e artikullit flitet p\u00ebr kompresimin, dekompresimi mbetet jasht\u00eb k\u00ebsaj arti\u00e7tike pasi aty \"gjith\u00e7ka \u00ebsht\u00eb n\u00eb rregull\". Dekompresimi kryhet ndjesh\u00ebm m\u00eb shpejt dhe kufizohet nga shpejt\u00ebsia e hyrjes\/daljes. Nj\u00eb b\u00ebrtham\u00eb fizike n\u00eb nj\u00eb rrjedh\u00eb leht\u00eb siguron shpejt\u00ebsi zhbllokimi n\u00eb nivelin 3-4 Gigabajt\/sekund.<\/p>\n<p>Kjo lidhet me munges\u00ebn n\u00eb procesin e zhbllokimit t\u00eb operacionit t\u00eb k\u00ebrkimit t\u00eb p\u00ebrputhjeve, i cili \"han\" burimet kryesore t\u00eb procesorit dhe caches gjat\u00eb kompresimit. <\/p>\n<h4>Besueshm\u00ebria e ruajtjes s\u00eb t\u00eb dh\u00ebnave t\u00eb kompresuara<\/h4>\n<p>\nSi\u00e7 n\u00ebnkuptohet nga emri i gjith\u00eb klas\u00ebs s\u00eb mjeteve softuerike q\u00eb p\u00ebrdorin kompresimin e t\u00eb dh\u00ebnave (arkivator\u00ebt), ato jan\u00eb t\u00eb destinuara p\u00ebr ruajtjen e informacionit p\u00ebr nj\u00eb periudh\u00eb t\u00eb gjat\u00eb, jo vite, por shekuj e mij\u00ebra vjet\u2026<\/p>\n<p>Gjat\u00eb ruajtjes, mbajt\u00ebsit e informacionit humbin nj\u00eb pjes\u00eb t\u00eb t\u00eb dh\u00ebnave, ja nj\u00eb shembull:<\/p>\n<p><img decoding=\"async\" alt=\"Kompressimi me rezistenc\u00eb t\u00eb lart\u00eb dhe t\u00eb shpejt\u00eb (Vazhdoi)\" src=\"\/wp-content\/uploads\/2019\/12\/b85564e175204e70ed7c3c3ed0fbf008.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nKy mbajt\u00ebs informacioni \"analogjik\" \u00ebsht\u00eb nj\u00eb mij\u00eb vje\u00e7ar, disa fragmente jan\u00eb humbur, por n\u00eb p\u00ebrgjith\u00ebsi informacioni \u00ebsht\u00eb \"lexuesh\u00ebm\"...<\/p>\n<p>Asnj\u00eb nga prodhuesit p\u00ebrgjegj\u00ebs t\u00eb sistemeve moderne t\u00eb ruajtjes dixhitale dhe mbajt\u00ebsve dixhital\u00eb t\u00eb tyre nuk jep 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, p\u00ebr ta zgjidhur do t\u00eb jen\u00eb pasardh\u00ebsit tan\u00eb...<\/p>\n<p>Sistemet e ruajtjes s\u00eb t\u00eb dh\u00ebnave dixhitale mund t\u00eb humbin 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 koh\u00eb, madje gjat\u00eb regjistrimit t\u00eb tyre, k\u00ebto shp\u00ebrndajje p\u00ebrpiqen t'i minimizojn\u00eb duke p\u00ebrdorur tepric\u00ebn dhe duke korrigjuar p\u00ebrmes sistemeve t\u00eb korrigjimit t\u00eb gabimeve. Tep\u00ebrca dhe sistemet e korrigjimit mund t\u00eb rikuperojn\u00eb informacionin e humbur jo gjithmon\u00eb dhe, n\u00ebse e b\u00ebjn\u00eb, nuk ka garanci se operacioni i rikuperimit ka shkuar 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>Kompressor\u00ebt modern\u00eb t\u00eb p\u00ebrdorur p\u00ebr arkivimin e t\u00eb dh\u00ebnave dixhitale jan\u00eb nd\u00ebrtuar mbi variante t\u00eb ndryshme t\u00eb metod\u00ebs s\u00eb fjalorit dhe p\u00ebr k\u00ebto arkiva humbja e nj\u00eb fragmenti t\u00eb informacionit do t\u00eb ishte nj\u00eb ngjarje fatale, madje ekziston nj\u00eb term i vendosur p\u00ebr nj\u00eb situat\u00eb t\u00eb till\u00eb - \"arkiv i d\u00ebmtuar\"...<\/p>\n<p>Besnik i ul\u00ebt i ruajtjes s\u00eb informacionit n\u00eb arkivat me kompresim me fjalor \u00ebsht\u00eb i lidhur 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 modifikohet n\u00eb m\u00ebnyr\u00eb dinamike nga teksti aktual q\u00eb kompresohet. N\u00eb rast humbjeje ose deformimi t\u00eb nj\u00eb fragmenti t\u00eb arkiv\u00ebs, t\u00eb gjitha regjistrimet e ardhshme t\u00eb arkiv\u00ebs nuk mund t\u00eb identifikohen as nga p\u00ebrmbajtja, as nga gjat\u00ebsia e regjistrimit n\u00eb fjalor, pasi nuk kuptohet se \u00e7far\u00eb i korrespondon numri i regjistrimit t\u00eb fjalorit.<\/p>\n<p>Rikuperimi i informacionit nga nj\u00eb arkiv t\u00eb till\u00eb \"t\u00eb prishur\" \u00ebsht\u00eb i pamundur.<\/p>\n<p>Algoritmi RTT \u00ebsht\u00eb nd\u00ebrtuar mbi nj\u00eb metod\u00eb m\u00eb t\u00eb besueshme p\u00ebr ruajtjen e t\u00eb dh\u00ebnave t\u00eb kompresuara. N\u00eb t\u00eb p\u00ebrdoret nj\u00eb metod\u00eb indekse p\u00ebr mbajtjen e fragmenteve t\u00eb p\u00ebrs\u00ebritura. Ky qasje ndaj kompresimit lejon minimizimin e pasojave t\u00eb deformimit t\u00eb informacionit n\u00eb mbajt\u00ebs, dhe n\u00eb shum\u00eb raste korrigjon automatikisht deformimet q\u00eb kan\u00eb lindur gjat\u00eb ruajtjes s\u00eb informacionit.<br \/>\nKjo lidhet me faktin se nj\u00eb skedar arkivor n\u00eb rastin e kompresimit me indekse p\u00ebrmban dy fusha:<\/p>\n<ul>\n<li>fusha e tekstit origjinal me pjes\u00ebt e p\u00ebrs\u00ebritura t\u00eb fshira nga ai;<\/li>\n<li>fusha e indekseve. <\/li>\n<\/ul>\n<p>\nFusha e indekseve, e cila \u00ebsht\u00eb kritikisht e r\u00ebnd\u00ebsishme p\u00ebr rikuperimin e informacionit, nuk \u00ebsht\u00eb e madhe dhe mund t\u00eb dyfishohet p\u00ebr besueshm\u00ebrin\u00eb e ruajtjes s\u00eb t\u00eb dh\u00ebnave. Prandaj, edhe n\u00ebse humbet nj\u00eb fragment i tekstit origjinal ose i matrit, gjith\u00eb informacioni tjet\u00ebr do t\u00eb rikuperohet pa probleme, si n\u00eb imazhin me nj\u00eb mbajt\u00ebs \"analog\" t\u00eb informacionit.<\/p>\n<h4>Disavantazhet e algoritmit<\/h4>\n<p>\nAsnj\u00eb virtyt nuk vjen pa disavantazhe. Metoda e indekseve t\u00eb kompresimit nuk kompreson sekuenca p\u00ebrs\u00ebrit\u00ebse t\u00eb gjat\u00eb t\u00eb vog\u00ebl. Kjo lidhet me kufizimet e metod\u00ebs s\u00eb indekseve. Indekset kan\u00eb nj\u00eb madh\u00ebsi prej t\u00eb pakt\u00ebn 3 byte dhe mund t\u00eb jen\u00eb deri n\u00eb 12 byte. N\u00ebse ndodh 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 merret parasysh, pavar\u00ebsisht sa shpesh k\u00ebto p\u00ebrs\u00ebritje identifikohen n\u00eb skedarin q\u00eb kompresohet.<\/p>\n<p>Metoda tradicionale e kompresionit, e cila p\u00ebrdor fjalor, kompreson efektivisht p\u00ebrs\u00ebritjet e shkurtra dhe p\u00ebr k\u00ebt\u00eb arin nj\u00eb koeficient m\u00eb t\u00eb lart\u00eb kompresimi sesa kompresimi indeksohet. Megjithat\u00eb, kjo arrihet n\u00eb kurriz t\u00eb ngarkes\u00ebs s\u00eb lart\u00eb t\u00eb procesorit qendror, p\u00ebr t\u00eb filluar t\u00eb kompresoj\u00eb t\u00eb dh\u00ebnat m\u00eb efektivisht se metoda indeksuese, metoda fjalor duhet t\u00eb reduktoj\u00eb shpejt\u00ebsin\u00eb e p\u00ebrpunimit t\u00eb t\u00eb dh\u00ebnave deri n\u00eb 10-20 megabajt p\u00ebr sekond\u00eb n\u00eb instalime reale t\u00eb llogaritjes kur CPU \u00ebsht\u00eb plot\u00ebsisht i ngarkuar.<\/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\u00ebrfaq\u00ebsojn\u00eb m\u00eb shum\u00eb nj\u00eb interes \u00abakademik\u00bb sesa praktik.<\/p>\n<p>Shkalla e kompresionit 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 n\u00eb zhvillim.<\/p>\n<p>Pra, si gjithmon\u00eb, vazhdimi vijon...<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 5.0.2 - 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