{"id":35106,"date":"2019-10-31T22:02:22","date_gmt":"2019-10-31T19:02:22","guid":{"rendered":"https:\/\/prohoster.info\/blog\/proizvoditelnost-setevyh-prilozhenij-linux-vvedenie\/"},"modified":"2019-10-31T22:02:22","modified_gmt":"2019-10-31T19:02:22","slug":"proizvoditelnost-setevyh-prilozhenij-linux-vvedenie","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/administrirovanie\/proizvoditelnost-setevyh-prilozhenij-linux-vvedenie","title":{"rendered":"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Aplikacionet web tani p\u00ebrdoren kudo, dhe nd\u00ebr t\u00eb gjith\u00eb protokollet e transportit, HTTP z\u00eb nj\u00eb pjes\u00eb t\u00eb madhe. Duke studiuar nuancat e zhvillimit t\u00eb aplikacioneve web, shumica e zhvilluesve i kushtojn\u00eb shum\u00eb pak v\u00ebmendje sistemit operativ ku k\u00ebto aplikacione realisht ekzekutohen. Ndara e zhvillimit (Dev) dhe operacioneve (Ops) vet\u00ebm sa e p\u00ebrkeq\u00ebsonte situat\u00ebn. Por me p\u00ebrhapjen e kultur\u00ebs DevOps, zhvilluesit fillojn\u00eb t\u00eb marrin p\u00ebrgjegj\u00ebsin\u00eb p\u00ebr ekzekutimin e aplikacioneve t\u00eb tyre n\u00eb cloud, prandaj \u00ebsht\u00eb shum\u00eb e dobishme p\u00ebr ta t\u00eb njohin n\u00eb thell\u00ebsi backend-in e sistemit operativ. Kjo \u00ebsht\u00eb ve\u00e7an\u00ebrisht e dobishme n\u00ebse po p\u00ebrpiqeni t\u00eb implementoni nj\u00eb sistem p\u00ebr mij\u00ebra apo dhjet\u00ebra mij\u00ebra lidhje simultane.<\/p>\n<p>Kufizimet n\u00eb sh\u00ebrbimet web jan\u00eb shum\u00eb t\u00eb ngjashme me kufizimet n\u00eb aplikacione t\u00eb tjera. Qoft\u00eb p\u00ebrball\u00ebsit e ngarkes\u00ebs apo server\u00ebt e DB, t\u00eb gjitha k\u00ebto aplikacione kan\u00eb probleme t\u00eb ngjashme n\u00eb nj\u00eb ambient me performanc\u00eb t\u00eb lart\u00eb. Kuptimi i k\u00ebtyre kufizimeve themelore dhe m\u00ebnyrave p\u00ebr t'i tejkaluar ato n\u00eb p\u00ebrgjith\u00ebsi do t'ju ndihmoj\u00eb t\u00eb vler\u00ebsoni performanc\u00ebn dhe shkall\u00ebzueshm\u00ebrin\u00eb e aplikacioneve tuaja web.<\/p>\n<p>Po shkrimin e k\u00ebsaj serie artikujsh n\u00eb p\u00ebrgjigje t\u00eb pyetjeve t\u00eb zhvilluesve t\u00eb rinj q\u00eb d\u00ebshirojn\u00eb t\u00eb b\u00ebhen arkitekt\u00eb sistemesh t\u00eb informuar mir\u00eb. \u00cbsht\u00eb e pamundur t\u00eb kuptohet qart\u00eb metodat e optimizimit t\u00eb aplikacioneve Linux, pa e p\u00ebrmbushur thelbin se si ato funksionojn\u00eb n\u00eb nivelin e sistemit operativ. Megjith\u00ebse ka shum\u00eb lloje aplikacionesh, n\u00eb k\u00ebt\u00eb cik\u00ebl d\u00ebshiroj t\u00eb studioj aplikacione rrjetesh, e jo ato desktop, si shfletuesit apo redaktuesit e tekstit. Ky material \u00ebsht\u00eb i dedikuar p\u00ebr zhvilluesit dhe arkitekt\u00ebt q\u00eb duan t\u00eb kuptojn\u00eb se si funksionojn\u00eb programet Linux ose Unix dhe si t'i strukturojn\u00eb ato p\u00ebr performanc\u00eb t\u00eb lart\u00eb.<br \/>\n<noindex><a rel=\"nofollow\" name=\"habracut\"><\/a><\/noindex><br \/>\nLinux \u00ebsht\u00eb <i>sistemi operacional<\/i> , dhe shpesh her\u00eb aplikacionet tuaja punojn\u00eb pik\u00ebrisht n\u00eb k\u00ebt\u00eb OS. Edhe pse po flas p\u00ebr \"Linux\", shumic\u00ebn e koh\u00ebs mund t\u00eb supozoni me besim se po i referohem t\u00eb gjitha sistemet operacionale t\u00eb ngjashme me Unix n\u00eb p\u00ebrgjith\u00ebsi. Megjithat\u00eb, un\u00eb nuk e kam testuar kodin shoq\u00ebrues n\u00eb sisteme t\u00eb tjera. Pra, n\u00ebse jeni t\u00eb interesuar p\u00ebr FreeBSD ose OpenBSD, rezultatet mund t\u00eb ndryshojn\u00eb. Kur t\u00eb provoj di\u00e7ka specifike p\u00ebr Linux, e theksoj k\u00ebt\u00eb.<\/p>\n<p>Edhe pse mund t\u00eb p\u00ebrdorni njohurit\u00eb e fituara p\u00ebr t\u00eb krijuar nj\u00eb aplikacion nga fillimi dhe ai do t\u00eb jet\u00eb optimalisht i optimizuar, \u00ebsht\u00eb m\u00eb mir\u00eb t\u00eb mos e b\u00ebni k\u00ebt\u00eb. N\u00ebse shkruani nj\u00eb server t\u00eb ri web n\u00eb C ose C++ p\u00ebr aplikacionin e biznesit t\u00eb organizat\u00ebs suaj, ndoshta do t\u00eb jet\u00eb dita juaj e fundit n\u00eb pun\u00eb. Megjithat\u00eb, njohja e struktur\u00ebs s\u00eb k\u00ebtyre aplikacioneve do t'ju ndihmoj\u00eb n\u00eb zgjedhjen e programeve ekzistuese. Do t\u00eb jeni n\u00eb gjendje t\u00eb krahasoni sisteme bazuar n\u00eb procese me sisteme bazuar n\u00eb rrjedha, si dhe me ato bazuar n\u00eb ngjarje. Do ta kuptoni dhe vler\u00ebsoni pse Nginx funksionon m\u00eb mir\u00eb se Apache httpd, pse aplikacioni Python i bazuar n\u00eb Tornado mund t\u00eb sh\u00ebrbej\u00eb m\u00eb shum\u00eb p\u00ebrdorues krahasuar me aplikacionin Python t\u00eb bazuar n\u00eb Django.<\/p>\n<h1>ZeroHTTPd: mjeti i m\u00ebsimit<\/h1>\n<p>\n<noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/shuveb\/zerohttpd\">ZeroHTTPd<\/a><\/noindex>\u00a0\u2014 server web q\u00eb e kam shkruar nga zero n\u00eb C si mjet m\u00ebsimi. Ai nuk ka var\u00ebsi t\u00eb jashtme, duke p\u00ebrfshir\u00eb aksesin n\u00eb Redis. Ne drejtojm\u00eb procedurat tona t\u00eb Redis. M\u00eb shum\u00eb informacion m\u00eb posht\u00eb.<\/p>\n<p>Megjith\u00ebse mund t\u00eb diskutojm\u00eb gjat\u00eb mbi teorin\u00eb, nuk ka gj\u00eb m\u00eb t\u00eb mir\u00eb se t\u00eb shkruash kod, ta ekzekutosh dhe t\u00eb krahasosh t\u00eb gjitha arkitektur\u00ebt e server\u00ebve. Ky \u00ebsht\u00eb metoda m\u00eb e qart\u00eb. Prandaj, do t\u00eb shkruajm\u00eb nj\u00eb server web t\u00eb thjesht\u00eb ZeroHTTPd, duke aplikuar \u00e7do model: bazuar n\u00eb procese, thread-e dhe ngjarje. Do t\u00eb kontrollojm\u00eb secilin prej k\u00ebtyre server\u00ebve dhe do t\u00eb shohim se si funksionojn\u00eb n\u00eb krahasim me nj\u00ebri-tjetrin. ZeroHTTPd \u00ebsht\u00eb implementuar n\u00eb nj\u00eb skedar C. Serveri i bazuar n\u00eb ngjarje p\u00ebrmban <noindex><a rel=\"nofollow\" href=\"https:\/\/troydhanson.github.io\/uthash\/\">uthash<\/a><\/noindex>, nj\u00eb realizim t\u00eb shk\u00eblqyer t\u00eb tabel\u00ebs hash, e cila ofrohet n\u00eb nj\u00eb skedar titulli. N\u00eb raste t\u00eb tjera, nuk ka asnj\u00eb var\u00ebsi p\u00ebr t\u00eb mos e komplikuar projektin.<\/p>\n<p>Kodi p\u00ebrmban shum\u00eb komentare p\u00ebr t\u00eb ndihmuar n\u00eb kuptim. Duke qen\u00eb nj\u00eb server i thjesht\u00eb web me disa rreshta kodi, ZeroHTTPd gjithashtu paraqet nj\u00eb korniz\u00eb minimale p\u00ebr zhvillimin e uebit. Ai ka funksionalitet t\u00eb kufizuar, por \u00ebsht\u00eb n\u00eb gjendje t\u00eb dor\u00ebzoj\u00eb skedar\u00eb statik\u00eb dhe faqe \"dinamike\" shum\u00eb t\u00eb thjeshta. Duhet t\u00eb them se ZeroHTTPd \u00ebsht\u00eb shum\u00eb i p\u00ebrshtatsh\u00ebm p\u00ebr t\u00eb m\u00ebsuar si t\u00eb krijoni aplikacione Linux me performanc\u00eb t\u00eb lart\u00eb. N\u00eb thelb, shumica e sh\u00ebrbimeve web presin k\u00ebrkesa, i kontrollojn\u00eb ato dhe i p\u00ebrpunojn\u00eb. K\u00ebshtu do t\u00eb veproj\u00eb ZeroHTTPd. Ky \u00ebsht\u00eb nj\u00eb mjet m\u00ebsimor, jo p\u00ebr prodhim. Ai nuk \u00ebsht\u00eb i fort\u00eb n\u00eb p\u00ebrpunimin e gabimeve dhe me siguri nuk do t\u00eb mburret me praktikat m\u00eb t\u00eb mira t\u00eb siguris\u00eb (o, po, e kam p\u00ebrdorur <code>strcpy<\/code>) ose me truket e sofistikuara t\u00eb gjuh\u00ebs C. Por shpresoj se ai do ta kryej\u00eb mir\u00eb detyr\u00ebn e tij.<\/p>\n<p><img decoding=\"async\" alt=\"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje\" src=\"\/wp-content\/uploads\/33fd0a5353667001523d5d4c8ada9ecf.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Faqja kryesore e ZeroHTTPd. Ai mund t\u00eb dor\u00ebzoj\u00eb lloje t\u00eb ndryshme skedar\u00ebsh, duke p\u00ebrfshir\u00eb imazhe<\/i><\/p>\n<h1>Aplikacioni i librit t\u00eb vizitor\u00ebve<\/h1>\n<p>\nAplikacionet moderne web zakonisht nuk kufizohen n\u00eb skedar\u00eb statik. Ato kan\u00eb nd\u00ebrveprime komplekse me bazat e t\u00eb dh\u00ebnave t\u00eb ndryshme, cache-et etj. Prandaj, ne do t\u00eb krijojm\u00eb nj\u00eb aplikacion t\u00eb thjesht\u00eb web me emrin \"Libri i Vizitor\u00ebve\", ku vizitor\u00ebt l\u00ebn\u00eb sh\u00ebnime n\u00ebn emrat e tyre. N\u00eb librin e vizitor\u00ebve ruhen sh\u00ebnimet e l\u00ebna m\u00eb par\u00eb. Ka gjithashtu nj\u00eb num\u00ebrues vizitor\u00ebsh n\u00eb fund t\u00eb faqes.<\/p>\n<p><img decoding=\"async\" alt=\"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje\" src=\"\/wp-content\/uploads\/ed8e828e8567d3d114875520988742d7.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Aplikacioni web \"Libri i Vizitor\u00ebve\" ZeroHTTPd<\/i><\/p>\n<p>Numri i vizitor\u00ebve dhe regjistrimi i librit t\u00eb mysafir\u00ebve ruhen n\u00eb Redis. P\u00ebr komunikimet me Redis, jan\u00eb implementuar procedura t\u00eb ve\u00e7anta, t\u00eb cilat nuk varen nga ndonj\u00eb bibliotek\u00eb t\u00eb jashtme. Nuk jam nj\u00eb adhurues i madh i hedhjes s\u00eb kodit t\u00eb b\u00ebr\u00eb vet\u00eb n\u00eb prodhim, kur ka zgjidhje t\u00eb publikuara dhe t\u00eb testuara mir\u00eb. Por q\u00ebllimi i ZeroHTTPd \u00ebsht\u00eb t\u00eb studioj\u00eb performanc\u00ebn e Linux-it dhe qasjen n\u00eb sh\u00ebrbime t\u00eb jashtme, nd\u00ebrsa trajtimi i k\u00ebrkesave HTTP ndikon ndjesh\u00ebm n\u00eb performanc\u00eb. Ne duhet t\u00eb kemi kontroll t\u00eb plot\u00eb mbi komunikimet me Redis n\u00eb secil\u00ebn nga arkitektur\u00ebn tona serverike. N\u00eb nj\u00eb arkitektur\u00eb, ne p\u00ebrdorim thirrje bllokuese, n\u00eb t\u00eb tjerat - procedura t\u00eb bazuara n\u00eb ngjarje. P\u00ebrdorimi i nj\u00eb biblioteke klienti t\u00eb jasht\u00ebm p\u00ebr Redis nuk do t\u00eb ofroj\u00eb nj\u00eb kontroll t\u00eb till\u00eb. P\u00ebr m\u00eb tep\u00ebr, klienti yn\u00eb i vog\u00ebl p\u00ebr Redis kryen vet\u00ebm disa funksione (marrja, konfigurimi dhe rritja e \u00e7el\u00ebsit; marrja dhe shtimi n\u00eb nj\u00eb mas\u00eb). Po ashtu, protokolli i Redis \u00ebsht\u00eb jasht\u00ebzakonisht elegant dhe i thjesht\u00eb. Nuk ka nevoj\u00eb madje t\u00eb m\u00ebsohet posa\u00e7\u00ebrisht. Fakti q\u00eb i gjith\u00eb puna e protokollit realizohet n\u00eb rreth nj\u00ebqind rreshta kodi tregon p\u00ebr sa mir\u00eb \u00ebsht\u00eb menduar.<\/p>\n<p>N\u00eb figur\u00ebn e m\u00ebposhtme jan\u00eb treguar veprimet e aplikacionit, kur klienti (shfletuesi) b\u00ebn nj\u00eb k\u00ebrkes\u00eb <code>\/guestbookURL<\/code>.<\/p>\n<p><img decoding=\"async\" alt=\"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje\" src=\"\/wp-content\/uploads\/5c5e6740419384b7232aeead95db491b.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Mekanizmi i funksionimit t\u00eb aplikacionit t\u00eb librit t\u00eb vizitor\u00ebve<\/i><\/p>\n<p>Kur duhet t\u00eb dor\u00ebzohet nj\u00eb faqe e librit t\u00eb vizitor\u00ebve, ndodh nj\u00eb thirrje n\u00eb sistemin e skedar\u00ebve p\u00ebr t\u00eb lexuar p\u00ebrshkrimin n\u00eb memorie dhe tri thirrje rrjeti n\u00eb Redis. Skedari i p\u00ebrshkrimit p\u00ebrmban pjes\u00ebn m\u00eb t\u00eb madhe t\u00eb p\u00ebrmbajtjes HTML p\u00ebr faqen n\u00eb sken\u00ebn e m\u00ebsip\u00ebrme. Aty ka gjithashtu vendmbush\u00ebs t\u00eb ve\u00e7ant\u00eb p\u00ebr pjes\u00ebn dinamike t\u00eb p\u00ebrmbajtjes: sh\u00ebnimet dhe num\u00ebruesin e vizitor\u00ebve. Ne i marrim ato nga Redis, i vendosim n\u00eb faqe dhe i dor\u00ebzojm\u00eb klientit p\u00ebrmbajtjen e formuar plot\u00ebsisht. Thirrja e tret\u00eb n\u00eb Redis mund t\u00eb shmanget, pasi Redis kthen nj\u00eb vler\u00eb t\u00eb re t\u00eb \u00e7el\u00ebsit kur rritet. Megjithat\u00eb, p\u00ebr serverin ton\u00eb me nj\u00eb arkitektur\u00eb t\u00eb asinkronizuar t\u00eb bazuar n\u00eb ngjarje, shum\u00eb thirrje rrjeti jan\u00eb nj\u00eb prov\u00eb e mir\u00eb p\u00ebr q\u00ebllime m\u00ebsimore. K\u00ebshtu, ne e heqim vler\u00ebn e kthyer nga Redis p\u00ebr numrin e vizitor\u00ebve dhe e k\u00ebrkojm\u00eb at\u00eb me nj\u00eb thirrje t\u00eb ve\u00e7ant\u00eb.<\/p>\n<h1>Arkitekturat serverike ZeroHTTPd<\/h1>\n<p>\nNe nd\u00ebrtojm\u00eb shtat\u00eb versione t\u00eb ZeroHTTPd me funksionalitete t\u00eb nj\u00ebjta, por me arkitektura t\u00eb ndryshme:<\/p>\n<ul>\n<li>Iterative\n<\/li>\n<li>Server fork (nj\u00eb proces dyt\u00ebsor p\u00ebr k\u00ebrkes\u00eb)\n<\/li>\n<li>Serveri pre-fork (parashikimi i proceseve)\n<\/li>\n<li>Serveri me rrjedha ekzekutimi (nj\u00eb thread p\u00ebr k\u00ebrkes\u00eb)\n<\/li>\n<li>Serveri me krijim paraprak t\u00eb rrjedhave\n<\/li>\n<li>Arkitektura e bazuar n\u00eb <code>poll()<\/code>\n<\/li>\n<li>Arkitektura e bazuar n\u00eb <code>epoll<\/code><\/li>\n<\/ul>\n<p>\nKemi matur performanc\u00ebn e secil\u00ebs arkitektur\u00eb duke ngarkuar serverin me k\u00ebrkesa HTTP. Por q\u00eb kur krahasojm\u00eb arkitektura me nj\u00eb shkall\u00eb t\u00eb lart\u00eb paralelizmi, numri i k\u00ebrkesave rritet. E testojm\u00eb tri her\u00eb dhe llogarisim mesataren.<\/p>\n<h1>Metodologjia e testimit<\/h1>\n<p>\n<img decoding=\"async\" alt=\"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje\" src=\"\/wp-content\/uploads\/aa4f337b6e90fa032fbef5374fac8f53.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<i>Instalimi p\u00ebr testim ngarkese ZeroHTTPd<\/i> <\/p>\n<p>\u00cbsht\u00eb e r\u00ebnd\u00ebsishme q\u00eb gjat\u00eb realizimit t\u00eb testeve, t\u00eb gjitha komponent\u00ebt t\u00eb mos funksionojn\u00eb n\u00eb t\u00eb nj\u00ebjt\u00ebn makin\u00eb. N\u00eb k\u00ebt\u00eb rast, OS ka shpenzime shtes\u00eb p\u00ebr planifikimin, pasi komponent\u00ebt garojn\u00eb p\u00ebr CPU. Matja e ngarkesave t\u00eb sistemit operativ me secil\u00ebn nga arkitekturat serverike t\u00eb zgjedhura \u00ebsht\u00eb nj\u00eb nga q\u00ebllimet m\u00eb t\u00eb r\u00ebnd\u00ebsishme t\u00eb k\u00ebtij ushtrimi. Shtimi i m\u00eb shum\u00eb variablave do t\u00eb ishte d\u00ebmtues p\u00ebr procesin. Prandaj, konfigurimi n\u00eb figur\u00ebn e m\u00ebsip\u00ebrme funksionon m\u00eb mir\u00eb.<\/p>\n<h3>\u00c7far\u00eb b\u00ebn secili nga k\u00ebta servera<\/h3>\n<p><\/p>\n<ul>\n<li>load.unixism.net: k\u00ebtu ne e lan\u00e7ojm\u00eb <code>ab<\/code>, utilitarin Apache Benchmark. Ajo krijon ngarkes\u00ebn e nevojshme p\u00ebr testimin e arkitekturave tona serverike.\n<\/li>\n<li>nginx.unixism.net: ndonj\u00ebher\u00eb duam t\u00eb drejtojm\u00eb m\u00eb shum\u00eb se nj\u00eb ekzemplar t\u00eb programit server. P\u00ebr k\u00ebt\u00eb, serveri Nginx me cil\u00ebsimet p\u00ebrkat\u00ebse punon si nj\u00eb balancues ngarkese, q\u00eb vjen nga <i>ab<\/i> proceset tona serverike.\n<\/li>\n<li>zerohttpd.unixism.net: k\u00ebtu ne drejtojm\u00eb programet tona serverike n\u00eb shtat\u00eb arkitektura t\u00eb ndryshme, nga nj\u00ebra n\u00eb tjetr\u00ebn.\n<\/li>\n<li>redis.unixism.net: n\u00eb k\u00ebt\u00eb server punon nj\u00eb demon Redis, ku ruhen regjistrimet n\u00eb lib\u00ebr vizitash dhe numri i vizitor\u00ebve.<\/li>\n<\/ul>\n<p>\nT\u00eb gjitha server\u00ebt punojn\u00eb n\u00eb nj\u00eb b\u00ebrtham\u00eb procesori. Ideja \u00ebsht\u00eb t\u00eb vler\u00ebsojm\u00eb performanc\u00ebn maksimale t\u00eb \u00e7do arkitekture. Duke qen\u00eb se t\u00eb gjitha programet serverike testohet n\u00eb nj\u00eb pajisje t\u00eb vetme, ky \u00ebsht\u00eb niveli baz\u00eb p\u00ebr krahasimin e tyre. Instalimi im i testimit p\u00ebrb\u00ebhet nga server\u00eb virtual\u00eb t\u00eb marr\u00eb me qira nga Digital Ocean.<\/p>\n<h3>\u00c7far\u00eb matim?<\/h3>\n<p>\nMund t\u00eb maten tregues t\u00eb ndrysh\u00ebm. Ne vler\u00ebsojm\u00eb performanc\u00ebn e \u00e7do arkitekture n\u00eb k\u00ebt\u00eb konfigurim duke ngarkuar server\u00ebt me k\u00ebrkesa n\u00eb nivele t\u00eb ndryshme t\u00eb paralelizm\u00ebs: ngarkesa rritet nga 20 n\u00eb 15,000 p\u00ebrdorues paralel.<\/p>\n<h1>Rezultatet e testeve<\/h1>\n<p>\nN\u00eb diagramin e m\u00ebposht\u00ebm tregohet performanca e server\u00ebve me arkitektur\u00eb t\u00eb ndryshme n\u00eb nivele t\u00eb ndryshme paralelismi. N\u00eb boshtin y \u2013 numri i k\u00ebrkesave p\u00ebr sekond\u00eb, n\u00eb boshtin x \u2013 lidhjet paralel.<\/p>\n<p><img decoding=\"async\" alt=\"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje\" src=\"\/wp-content\/uploads\/3415bcfb66503152d644130f68bd19da.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje\" src=\"\/wp-content\/uploads\/ba457b671eb758f3226e0eeafaadc6aa.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\n<img decoding=\"async\" alt=\"Performanca e aplikacioneve rrjet\u00ebrore Linux. Hyrje\" src=\"\/wp-content\/uploads\/aea06856d61d4d4bdda9814c53a28d4a.png\" style=\"display:block;margin: 0 auto;\" \/><br \/>\n<br \/>\nM\u00eb posht\u00eb \u00ebsht\u00eb tabela me rezultatet.<\/p>\n<p> k\u00ebrkesa p\u00ebr sekond\u00eb <\/p>\n<p><strong>paralelism<\/strong><br \/>\n<strong>iterativ<\/strong><br \/>\n<strong>fork<\/strong><br \/>\n<strong>pre-fork<\/strong><br \/>\n<strong>nd\u00ebrthurr\u00ebs<\/strong><br \/>\n<strong>pre-t\u00ebnd\u00ebs<\/strong><br \/>\n<strong>poll<\/strong><br \/>\n<strong>epoll<\/strong><\/p>\n<p>20<br \/>\n7<br \/>\n112<br \/>\n2100<br \/>\n1800<br \/>\n2250<br \/>\n1900<br \/>\n2050<\/p>\n<p>50<br \/>\n7<br \/>\n190<br \/>\n2200<br \/>\n1700<br \/>\n2200<br \/>\n2000<br \/>\n2000<\/p>\n<p>100<br \/>\n7<br \/>\n245<br \/>\n2200<br \/>\n1700<br \/>\n2200<br \/>\n2150<br \/>\n2100<\/p>\n<p>200<br \/>\n7<br \/>\n330<br \/>\n2300<br \/>\n1750<br \/>\n2300<br \/>\n2200<br \/>\n2100<\/p>\n<p>300<br \/>\n\u2013<br \/>\n380<br \/>\n2200<br \/>\n1800<br \/>\n2400<br \/>\n2250<br \/>\n2150<\/p>\n<p>400<br \/>\n\u2013<br \/>\n410<br \/>\n2200<br \/>\n1750<br \/>\n2600<br \/>\n2000<br \/>\n2000<\/p>\n<p>500<br \/>\n\u2013<br \/>\n440<br \/>\n2300<br \/>\n1850<br \/>\n2700<br \/>\n1900<br \/>\n2212<\/p>\n<p>600<br \/>\n\u2013<br \/>\n460<br \/>\n2400<br \/>\n1800<br \/>\n2500<br \/>\n1700<br \/>\n2519<\/p>\n<p>700<br \/>\n\u2013<br \/>\n460<br \/>\n2400<br \/>\n1600<br \/>\n2490<br \/>\n1550<br \/>\n2607<\/p>\n<p>800<br \/>\n\u2013<br \/>\n460<br \/>\n2400<br \/>\n1600<br \/>\n2540<br \/>\n1400<br \/>\n2553<\/p>\n<p>900<br \/>\n\u2013<br \/>\n460<br \/>\n2300<br \/>\n1600<br \/>\n2472<br \/>\n1200<br \/>\n2567<\/p>\n<p>1000<br \/>\n\u2013<br \/>\n475<br \/>\n2300<br \/>\n1700<br \/>\n2485<br \/>\n1150<br \/>\n2439<\/p>\n<p>1500<br \/>\n\u2013<br \/>\n490<br \/>\n2400<br \/>\n1550<br \/>\n2620<br \/>\n900<br \/>\n2479<\/p>\n<p>2000<br \/>\n\u2013<br \/>\n350<br \/>\n2400<br \/>\n1400<br \/>\n2396<br \/>\n550<br \/>\n2200<\/p>\n<p>2500<br \/>\n\u2013<br \/>\n280<br \/>\n2100<br \/>\n1300<br \/>\n2453<br \/>\n490<br \/>\n2262<\/p>\n<p>3000<br \/>\n\u2013<br \/>\n280<br \/>\n1900<br \/>\n1250<br \/>\n2502<br \/>\nshkall\u00ebzim t\u00eb madh<br \/>\n2138<\/p>\n<p>5000<br \/>\n\u2013<br \/>\nshkall\u00ebzim t\u00eb madh<br \/>\n1600<br \/>\n1100<br \/>\n2519<br \/>\n\u2013<br \/>\n2235<\/p>\n<p>8000<br \/>\n\u2013<br \/>\n\u2013<br \/>\n1200<br \/>\nshkall\u00ebzim t\u00eb madh<br \/>\n2451<br \/>\n\u2013<br \/>\n2100<\/p>\n<p>10\u00a0000<br \/>\n\u2013<br \/>\n\u2013<br \/>\nshkall\u00ebzim t\u00eb madh<br \/>\n\u2013<br \/>\n2200<br \/>\n\u2013<br \/>\n2200<\/p>\n<p>11\u00a0000<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n2200<br \/>\n\u2013<br \/>\n2122<\/p>\n<p>12\u00a0000<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n970<br \/>\n\u2013<br \/>\n1958<\/p>\n<p>13\u00a0000<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n730<br \/>\n\u2013<br \/>\n1897<\/p>\n<p>14\u00a0000<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n590<br \/>\n\u2013<br \/>\n1466<\/p>\n<p>15\u00a0000<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n\u2013<br \/>\n532<br \/>\n\u2013<br \/>\n1281<\/p>\n<p>\nNga grafiku dhe tabela shihet se mbi 8000 k\u00ebrkesa t\u00eb nj\u00ebkohshme na mbeten vet\u00ebm dy lojtar\u00eb: pre-fork dhe epoll. Nd\u00ebrsa ngarkohet, serveri n\u00eb baz\u00eb t\u00eb poll punon m\u00eb keq se nd\u00ebrruesi. Arkitektura me krijim t\u00eb paraprak t\u00eb nd\u00ebrruesve ofron nj\u00eb konkurrenc\u00eb t\u00eb denj\u00eb ndaj epoll: kjo \u00ebsht\u00eb nj\u00eb d\u00ebshmi se sa mir\u00eb b\u00ebrthama Linux planifikon nj\u00eb num\u00ebr t\u00eb madh t\u00eb nd\u00ebrruesve.<\/p>\n<h1>Kodi origjinal ZeroHTTPd<\/h1>\n<p>\nKodi origjinal ZeroHTTPd <noindex><a rel=\"nofollow\" href=\"https:\/\/github.com\/shuveb\/zerohttpd\">k\u00ebtu<\/a><\/noindex>. \u00c7do arkitektur\u00eb ka nj\u00eb katalog t\u00eb ve\u00e7ant\u00eb.<\/p>\n<pre>ZeroHTTPd\n\u2502\n\u251c\u2500\u2500 01_iterative\n\u2502   \u251c\u2500\u2500 main.c\n\u251c\u2500\u2500 02_forking\n\u2502   \u251c\u2500\u2500 main.c\n\u251c\u2500\u2500 03_preforking\n\u2502   \u251c\u2500\u2500 main.c\n\u251c\u2500\u2500 04_threading\n\u2502   \u251c\u2500\u2500 main.c\n\u251c\u2500\u2500 05_prethreading\n\u2502   \u251c\u2500\u2500 main.c\n\u251c\u2500\u2500 06_poll\n\u2502   \u251c\u2500\u2500 main.c\n\u251c\u2500\u2500 07_epoll\n\u2502    \u2514\u2500\u2500 main.c\n\u251c\u2500\u2500 Makefile\n\u251c\u2500\u2500 public\n\u2502   \u251c\u2500\u2500 index.html\n\u2502   \u2514\u2500\u2500 tux.png\n\u2514\u2500\u2500 templates\n    \u2514\u2500\u2500 guestbook\n        \u2514\u2500\u2500 index.html<\/pre>\n<p>\nP\u00ebrve\u00e7 shtat\u00eb drejtorive p\u00ebr t\u00eb gjitha arkitektur\u00ebn, n\u00eb katalogun kryesor ka edhe dy t\u00eb tjera: public dhe templates. N\u00eb t\u00eb par\u00ebn ndodhet skedari index.html dhe imazhi nga ekrani i par\u00eb. Aty mund t\u00eb vendosni skedar\u00eb dhe dosje t\u00eb tjera, dhe ZeroHTTPd duhet t\u00eb shfaq\u00eb k\u00ebto skedar\u00eb statik\u00eb pa probleme. N\u00ebse rruga n\u00eb shfletues p\u00ebrputhet me rrug\u00ebn n\u00eb dosjen public, at\u00ebher\u00eb ZeroHTTPd k\u00ebrkon skedarin index.html n\u00eb k\u00ebt\u00eb katalog. P\u00ebrmbajtja p\u00ebr librin e mysafir\u00ebve gjenerohet dinamikisht. Ai ka vet\u00ebm faqen kryesore, dhe p\u00ebrmbajtja e saj bazohet n\u00eb skedarin 'templates\/guestbook\/index.html'. N\u00eb ZeroHTTPd \u00ebsht\u00eb e leht\u00eb t\u00eb shtoni faqe dinamike p\u00ebr zgjerim. Ideja \u00ebsht\u00eb q\u00eb p\u00ebrdoruesit mund t\u00eb shtojn\u00eb n\u00eb k\u00ebt\u00eb katalog modele dhe t\u00eb zgjasin ZeroHTTPd sipas nevoj\u00ebs.<\/p>\n<p>P\u00ebr t\u00eb nd\u00ebrtuar t\u00eb shtat\u00eb server\u00ebt, aktivizoni <code>make all<\/code> nga katalogu kryesor - dhe t\u00eb gjitha nd\u00ebrtimet do t\u00eb shfaqen n\u00eb k\u00ebt\u00eb katalog. Skedar\u00ebt ekzekutiv\u00eb k\u00ebrkojn\u00eb katalog\u00ebt public dhe templates n\u00eb katalogun nga ku ato aktivizohen.<\/p>\n<h1>Linux API<\/h1>\n<p>\nP\u00ebr t\u00eb kuptuar informacionin n\u00eb k\u00ebt\u00eb cik\u00ebl artikujsh, nuk \u00ebsht\u00eb e nevojshme t\u00eb keni njohuri t\u00eb thella n\u00eb Linux API. Megjithat\u00eb, rekomandoj t\u00eb lexoni m\u00eb shum\u00eb rreth k\u00ebsaj teme, pasi ka shum\u00eb burime referuese n\u00eb internet. Edhe pse ne do t\u00eb prekim disa kategori t\u00eb Linux API, v\u00ebmendja jon\u00eb do t\u00eb fokusohet kryesisht n\u00eb procese, rrjedha, ngjarje dhe stek rrjeti. P\u00ebrve\u00e7 librave dhe artikujve mbi Linux API, rekomandoj gjithashtu t\u00eb lexoni man-in p\u00ebr thirrjet sistemore dhe funksionet e p\u00ebrdorura n\u00eb biblioteka.<\/p>\n<h1>Performanca dhe shkall\u00ebzueshm\u00ebria<\/h1>\n<p>\nNj\u00eb v\u00ebrejtje n\u00eb lidhje me performanc\u00ebn dhe shkall\u00ebzueshm\u00ebrin\u00eb. Teorikisht, nuk ka asnj\u00eb lidhje mes tyre. Mund t\u00eb keni nj\u00eb sh\u00ebrbim web-i q\u00eb punon shum\u00eb mir\u00eb, me nj\u00eb koh\u00eb p\u00ebrgjigjeje disa milisekonda, por q\u00eb nuk shkall\u00ebzohet fare. Po ashtu, mund t\u00eb ket\u00eb nj\u00eb aplikacion web q\u00eb punon keq, q\u00eb k\u00ebrkon disa sekonda p\u00ebr t\u00eb p\u00ebrgjigjur, por q\u00eb shkall\u00ebzohet p\u00ebr t\u00eb trajtuar dhjet\u00ebra mij\u00ebra p\u00ebrdorues n\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb. Megjithat\u00eb, kombinimi i performanc\u00ebs s\u00eb lart\u00eb dhe shkall\u00ebzueshm\u00ebris\u00eb \u00ebsht\u00eb nj\u00eb kombinim shum\u00eb i fuqish\u00ebm. Aplikacionet me performanc\u00eb t\u00eb lart\u00eb n\u00eb p\u00ebrgjith\u00ebsi p\u00ebrdorin n\u00eb m\u00ebnyr\u00eb efikase burimet dhe, k\u00ebshtu, sh\u00ebrbejn\u00eb m\u00eb shum\u00eb p\u00ebrdorues n\u00eb t\u00eb nj\u00ebjt\u00ebn koh\u00eb n\u00eb server, duke reduktuar kostot.<\/p>\n<h1>Detyrat CPU dhe I\/O<\/h1>\n<p>\nN\u00eb computing, gjithmon\u00eb ka dy lloje t\u00eb mundshme t\u00eb detyrave: p\u00ebr I\/O dhe CPU. Marrja e k\u00ebrkesave p\u00ebrmes internetit (I\/O rrjeti), administrimi i skedar\u00ebve (I\/O rrjeti dhe disku), komunikimi me baz\u00ebn e t\u00eb dh\u00ebnave (I\/O rrjeti dhe disku) \u2014 t\u00eb gjitha k\u00ebto jan\u00eb aktivitete I\/O. Disa k\u00ebrkesa ndaj BDs mund t\u00eb ngarkojn\u00eb pak CPU-n\u00eb (renditja, llogaritja e mesatares s\u00eb nj\u00eb milioni rezultateve etj.). Shumica e aplikacioneve web jan\u00eb t\u00eb kufizuara n\u00eb I\/O-nin maksimal t\u00eb mundsh\u00ebm, nd\u00ebrsa procesori p\u00ebrdoret rrall\u00eb n\u00eb kapacitetin e tij t\u00eb plot\u00eb. Kur sheh q\u00eb nj\u00eb detyr\u00eb I\/O po p\u00ebrdor shum\u00eb CPU, kjo ka t\u00eb ngjar\u00eb t\u00eb jet\u00eb nj\u00eb shenj\u00eb e nj\u00eb arkitekture aplikacioni t\u00eb keqe. Kjo mund t\u00eb n\u00ebnkuptoj\u00eb se burimet e CPU-s\u00eb po shpenzohen p\u00ebr menaxhimin e proceseve dhe p\u00ebr kalimin e kontekstit \u2014 dhe kjo nuk \u00ebsht\u00eb shum\u00eb e dobishme. N\u00ebse jeni duke b\u00ebr\u00eb di\u00e7ka si p\u00ebrpunimi i imazheve, konvertimi i skedar\u00ebve audio apo m\u00ebsimi automatik, at\u00ebher\u00eb aplikacioni k\u00ebrkon burime t\u00eb fuqishme CPU-je. Por p\u00ebr shumic\u00ebn e aplikacioneve, nuk \u00ebsht\u00eb k\u00ebshtu.<\/p>\n<h1>M\u00eb shum\u00eb detaje mbi arkitekturat e server\u00ebve<\/h1>\n<p><\/p>\n<ol>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/unixism.net\/2019\/04\/28\/linux-applications-performance-part-i-iterative-servers\/\">Pjesa I. Arkitektura iteruese<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/unixism.net\/2019\/04\/28\/linux-applications-performance-part-ii-forking-servers\/\">Pjesa II. Server\u00ebt fork<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/unixism.net\/2019\/04\/28\/linux-applications-performance-part-iii-preforked-servers\/\">Pjesa III. Server\u00ebt para-fork<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/unixism.net\/2019\/04\/28\/linux-applications-performance-part-iv-threaded-servers\/\">Pjesa IV. Server\u00ebt me rrjedha ekzekutimi<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/unixism.net\/2019\/04\/28\/linux-applications-performance-part-v-pre-threaded-servers\/\">Pjesa V. Server\u00ebt me krijim t\u00eb parakohsh\u00ebm t\u00eb rrjedhave<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/unixism.net\/2019\/04\/28\/linux-applications-performance-part-vi-polling-servers\/\">Pjesa VI. Arkitektura n\u00eb baz\u00eb t\u00eb poll<\/a><\/noindex><\/li>\n<li><noindex><a rel=\"nofollow\" href=\"http:\/\/unixism.net\/2019\/04\/28\/linux-applications-performance-part-vii-epoll-servers\/\">Pjesa VII. Arkitektura n\u00eb baz\u00eb t\u00eb epoll<\/a><\/noindex><\/li>\n<\/ol>\n<p>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/habr.com\/ru\/post\/455212\/\">habr.com<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412\u0435\u0431-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u043d\u044b\u043d\u0435 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u044e\u0442\u0441\u044f \u043f\u043e\u0432\u0441\u0435\u043c\u0435\u0441\u0442\u043d\u043e, \u0430 \u0441\u0440\u0435\u0434\u0438 \u0432\u0441\u0435\u0445 \u0442\u0440\u0430\u043d\u0441\u043f\u043e\u0440\u0442\u043d\u044b\u0445 \u043f\u0440\u043e\u0442\u043e\u043a\u043e\u043b\u043e\u0432 \u043b\u044c\u0432\u0438\u043d\u0443\u044e \u0434\u043e\u043b\u044e \u0437\u0430\u043d\u0438\u043c\u0430\u0435\u0442 HTTP. \u0418\u0437\u0443\u0447\u0430\u044f \u043d\u044e\u0430\u043d\u0441\u044b \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u0432\u0435\u0431-\u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439, \u0431\u043e\u043b\u044c\u0448\u0438\u043d\u0441\u0442\u0432\u043e \u0443\u0434\u0435\u043b\u044f\u0435\u0442 \u043e\u0447\u0435\u043d\u044c \u043c\u0430\u043b\u043e \u0432\u043d\u0438\u043c\u0430\u043d\u0438\u044f \u043e\u043f\u0435\u0440\u0430\u0446\u0438\u043e\u043d\u043d\u043e\u0439 \u0441\u0438\u0441\u0442\u0435\u043c\u0435, \u0433\u0434\u0435 \u044d\u0442\u0438 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u044f \u0440\u0435\u0430\u043b\u044c\u043d\u043e \u0437\u0430\u043f\u0443\u0441\u043a\u0430\u044e\u0442\u0441\u044f. \u0420\u0430\u0437\u0434\u0435\u043b\u0435\u043d\u0438\u0435 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u043a\u0438 (Dev) \u0438 \u044d\u043a\u0441\u043f\u043b\u0443\u0430\u0442\u0430\u0446\u0438\u0438 (Ops) \u043b\u0438\u0448\u044c \u0443\u0445\u0443\u0434\u0448\u0430\u043b\u043e \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u044e. \u041d\u043e \u0441 \u0440\u0430\u0441\u043f\u0440\u043e\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0438\u0435\u043c \u043a\u0443\u043b\u044c\u0442\u0443\u0440\u044b DevOps \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0438 \u043d\u0430\u0447\u0438\u043d\u0430\u044e\u0442 \u043d\u0435\u0441\u0442\u0438 \u043e\u0442\u0432\u0435\u0442\u0441\u0442\u0432\u0435\u043d\u043d\u043e\u0441\u0442\u044c \u0437\u0430 \u0437\u0430\u043f\u0443\u0441\u043a \u0441\u0432\u043e\u0438\u0445 \u043f\u0440\u0438\u043b\u043e\u0436\u0435\u043d\u0438\u0439 \u0432 \u043e\u0431\u043b\u0430\u043a\u0435, \u043f\u043e\u044d\u0442\u043e\u043c\u0443 \u0434\u043b\u044f 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