{"id":100221,"date":"2021-05-21T10:23:03","date_gmt":"2021-05-21T08:23:03","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/optimizacziya-linux-dlya-obrabotki-1-2-mln-json-zaprosov-v-sekundu"},"modified":"2021-05-21T10:23:03","modified_gmt":"2021-05-21T08:23:03","slug":"optimizacziya-linux-dlya-obrabotki-1-2-mln-json-zaprosov-v-sekundu","status":"publish","type":"post","link":"https:\/\/prohoster.info\/sq\/blog\/novosti-interneta\/optimizacziya-linux-dlya-obrabotki-1-2-mln-json-zaprosov-v-sekundu","title":{"rendered":"Optimizimi i Linux p\u00ebr p\u00ebrpunimin e 1.2 milion k\u00ebrkesave JSON n\u00eb sekond\u00eb","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>Publikuar nj\u00eb udh\u00ebzues t\u00eb detajuar p\u00ebr p\u00ebrshtatjen e ambientit Linux p\u00ebr arritjen e performanc\u00ebs maksimale n\u00eb p\u00ebrpunimin e k\u00ebrkesave HTTP. Metodat e propozuara lejuan ngritjen e performanc\u00ebs s\u00eb handler-it JSON t\u00eb bazuar n\u00eb bibliotek\u00ebn libreactor n\u00eb ambientin Amazon EC2 (4 vCPU) nga 224 mij\u00eb k\u00ebrkesa API n\u00eb sekond\u00eb me konfigurime standarde t\u00eb Amazon Linux 2 me b\u00ebrtham\u00ebn 4.14 n\u00eb 1.2 milion k\u00ebrkesa n\u00eb sekond\u00eb pas optimizimit (rritje prej 436%), si dhe \u00e7uan n\u00eb reduktimin e vonesave gjat\u00eb p\u00ebrpunimit t\u00eb k\u00ebrkesave me 79%. Metodat e propozuara nuk jan\u00eb specifike p\u00ebr libreactor dhe funksionojn\u00eb me p\u00ebrdorimin e server\u00ebve t\u00eb tjer\u00eb http, p\u00ebrfshir\u00eb nginx, Actix, Netty dhe Node.js (libreactor u p\u00ebrdor n\u00eb testime, pasi zgjidhja e bazuar n\u00eb t\u00eb tregoi performanc\u00ebn m\u00eb t\u00eb mir\u00eb).      <center><img decoding=\"async\" alt=\"Optimizimi i Linux p\u00ebr p\u00ebrpunimin e 1.2 milion k\u00ebrkesave JSON n\u00eb sekond\u00eb\" src=\"\/wp-content\/uploads\/2021\/05\/908fb8d92e84a3e7557af7f6c622298e.png\" style=\"display:block;margin: 0 auto;\" \/><\/center>    <\/p>\n<p>Optimizimet kryesore:  <\/p>\n<ul>\n<li class=\"l\"> Optimizimi i kodit libreactor. Si baz\u00eb \u00ebsht\u00eb p\u00ebrdorur varianti R18 nga grupi Techempower, i cili \u00ebsht\u00eb p\u00ebrmir\u00ebsuar duke hequr kodin q\u00eb kufizon numrin e b\u00ebrthamave t\u00eb CPU (optimizimi arriti t\u00eb p\u00ebrmir\u00ebsoj\u00eb performanc\u00ebn me 25-27%), nd\u00ebrtimi n\u00eb GCC me opsionet \"-O3\" (rritje 5-10%) dhe \"-march-native\" (5-10%), z\u00ebvend\u00ebsimi i thirrjeve read\/write me recv\/send (5-10%) dhe ulja e tarifave t\u00eb p\u00ebrdorimit t\u00eb pthreads (2-3%). Rritja totale e performanc\u00ebs pas optimizimit t\u00eb kodit ishte 55%, dhe kapaciteti kaloi nga 224k req\/s n\u00eb 347k req\/s.\n<li class=\"l\"> \u00c7aktivizimi i mbrojtjes nga dob\u00ebsit\u00eb q\u00eb shkaktohen nga ekzekutimi spekulativ i komandave. P\u00ebrdorimi i parametrave gjat\u00eb ngarkimit t\u00eb b\u00ebrtham\u00ebs \"nospectre_v1 nospectre_v2 pti=off mds=off tsx_async_abort=off\" mund\u00ebsoi rritjen e performanc\u00ebs me 28%, dhe kapaciteti kaloi nga 347k req\/s n\u00eb 446k req\/s. N\u00eb m\u00ebnyr\u00eb t\u00eb ve\u00e7ant\u00eb, rritja nga parametri \"nospectre_v1\" (mbrojtja nga Spectre v1 + SWAPGS) ishte 1-2%, \"nospectre_v2\" (mbrojtja nga Spectre v2) - 15-20%, \"pti=off\" (Spectre v3\/Meltdown) - 6%, \"mds=off tsx_async_abort=off\" (MDS\/Zombieload dhe TSX Asynchronous Abort) - 6%. Konfigurimet p\u00ebr mbrojtjen nga sulmet L1TF\/Foreshadow (l1tf=flush), iTLB multihit, Speculative Store Bypass dhe SRBDS u lan\u00eb pa ndryshim, pasi nuk pat\u00ebn ndikim n\u00eb performanc\u00eb, p\u00ebr shkak se nuk u p\u00ebrputh\u00ebn me konfigurimin n\u00eb test. <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/vps\/abuzoustojchivye-vps\/\"   title=\"KVM\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"4395\">KVM<\/a>, virtualizimin e brendsh\u00ebm dhe modelet e tjera t\u00eb CPU).\n<li class=\"l\"> \u00c7aktivizimi i mekanizmave t\u00eb auditimit dhe bllokimit t\u00eb thirrjeve t\u00eb sistemit p\u00ebrmes komand\u00ebs \"auditctl -a never,task\" dhe specifikimit t\u00eb opsionit \"--security-opt seccomp=unconfined\" gjat\u00eb fillimit t\u00eb kontejnerit docker. Rritja totale e performanc\u00ebs ishte 11%, dhe kapaciteti kaloi nga 446k req\/s n\u00eb 495k req\/s.\n<li class=\"l\"> \u00c7aktivizimi i iptables\/netfilter p\u00ebrmes shkarkimit t\u00eb moduleve t\u00eb lidhura t\u00eb b\u00ebrtham\u00ebs. Ideja p\u00ebr t\u00eb \u00e7aktivizuar firewall-in, i cili nuk p\u00ebrdorej n\u00eb zgjidhjen specifike t\u00eb serverit, u nxit nga rezultatet e profilizimit, sipas t\u00eb cilave funksioni nf_hook_slow merrte 18% t\u00eb koh\u00ebs. Vlen t\u00eb theksohet se nftables funksionon m\u00eb efektivisht se iptables, por n\u00eb Amazon Linux vazhdon t\u00eb p\u00ebrdoret iptables. Pas \u00e7aktivizimit t\u00eb iptables, rritja e performanc\u00ebs ishte 22%, nd\u00ebrsa kapaciteti kaloi nga 495k req\/s n\u00eb 603k req\/s.\n<li class=\"l\"> Reduktimi i migrimit t\u00eb menaxhuesve midis b\u00ebrthamave t\u00eb ndryshme CPU p\u00ebr t\u00eb rritur efikasitetin e p\u00ebrdorimit t\u00eb caches t\u00eb procesor\u00ebve. Optimizimi u krye si n\u00eb nivelin e lidhjes s\u00eb proceseve libreactor me b\u00ebrthamat e CPU (CPU Pinning), ashtu edhe p\u00ebrmes fijes s\u00eb menaxhuesve t\u00eb rrjetit n\u00eb b\u00ebrtham\u00eb (Receive Side Scaling). P\u00ebr shembull, u \u00e7aktivizua irqbalance dhe u vendos\u00ebn qart\u00eb lidhjet e radh\u00ebve me CPU n\u00eb \/proc\/irq\/$IRQ\/smp_affinity_list. P\u00ebr t\u00eb p\u00ebrdorur t\u00eb nj\u00ebjt\u00ebn b\u00ebrtham\u00eb CPU p\u00ebr procesin libreactor dhe radh\u00ebn e paketave hyr\u00ebse, u angazhua nj\u00eb menaxhues BPF i ve\u00e7ant\u00eb, i lidhur p\u00ebrmes vendosjes s\u00eb flamurit SO_ATTACH_REUSEPORT_CBPF gjat\u00eb krijimit t\u00eb soketit. P\u00ebr lidhjen e CPU-s\u00eb s\u00eb radh\u00ebve t\u00eb paketave dal\u00ebse, u ndryshuan konfigurimet n\u00eb \/sys\/class\/net\/eth0\/queues\/tx-&lt;n&gt;\/xps_cpus. Rritja totale e performanc\u00ebs ishte 38%, nd\u00ebrsa kapaciteti kaloi nga 603k req\/s n\u00eb 834k req\/s.\n<li class=\"l\"> Optimizimi i p\u00ebrpunimit t\u00eb nd\u00ebrprerjeve dhe p\u00ebrdorimi i polling-ut. Aktivizimi i modalitetit adaptive-rx n\u00eb drejtuesin ENA dhe manipullimi me sysctl net.core.busy_read mund\u00ebsuan nj\u00eb rritje t\u00eb performanc\u00ebs me 28% (kapaciteti kaloi nga 834k req\/s n\u00eb 1.06M req\/s, dhe vonesat ran\u00eb nga 361\u03bcs n\u00eb 292\u03bcs).\n<li class=\"l\"> \u00c7aktivizimi i sh\u00ebrbimeve sistemore q\u00eb \u00e7ojn\u00eb n\u00eb bllokime t\u00eb panevojshme n\u00eb struktur\u00ebn e rrjetit. \u00c7aktivizimi i dhclient dhe vendosja <a class=\"wpil_keyword_link\" href=\"https:\/\/prohoster.info\/sq\/lir\/ipv4\/\"   title=\"adresat IP\" data-wpil-keyword-link=\"linked\"  data-wpil-monitor-id=\"683\">adresat IP<\/a> me dor\u00eb e rriti performanc\u00ebn me 6%, nd\u00ebrsa kapaciteti kaloi nga 1.06M req\/s n\u00eb 1.12M req\/s. Arsyeja e ndikimit t\u00eb dhclient n\u00eb performanc\u00eb \u00ebsht\u00eb analizuar duke p\u00ebrdorur soket t\u00eb pap\u00ebrpunuar.\n<li class=\"l\"> Lidhja me Spin Lock. Kalimi i grupeve rrjetore n\u00eb modalitetin \"noqueue\" p\u00ebrmes sysctl \"net.core.default_qdisc=noqueue\" dhe \"tc qdisc replace dev eth0 root mq\" rezultoi n\u00eb nj\u00eb rritje t\u00eb performanc\u00ebs me 2%, dhe kapaciteti kaloi nga 1.12M req\/s n\u00eb 1.15M req\/s.\n<li class=\"l\"> Optimizimet e fundit, si \u00e7aktivizimi i GRO (Generic Receive Offload) p\u00ebrmes komand\u00ebs \"ethtool -K eth0 gro off\" dhe z\u00ebvend\u00ebsimi i algoritmit t\u00eb kontrollit t\u00eb ngarkes\u00ebs cubic me reno p\u00ebrmes sysctl \"net.ipv4.tcp_congestion_control=reno\". Rritja totale e performanc\u00ebs ishte 4%. Kapaciteti kaloi nga 1.15M req\/s n\u00eb 1.2M req\/s.          <\/ul>\n<p>P\u00ebrve\u00e7 optimizimeve t\u00eb realizuara, artikulli gjithashtu shqyrton metoda q\u00eb nuk \u00e7uan n\u00eb rritjen e pritur t\u00eb performanc\u00ebs. P\u00ebr shembull, ato q\u00eb u treguan t\u00eb pasuksesshme ishin:    <\/p>\n<ul>\n<li class=\"l\"> Ekzekutimi i ve\u00e7ant\u00eb i libreactor nuk e ndryshoi performanc\u00ebn nga ekzekutimi n\u00eb kontejner. Z\u00ebvend\u00ebsimi i writev me send, rritja e maxevents n\u00eb epoll_wait, eksperimentet me versionet dhe flagjet GCC (efekti ishte i duksh\u00ebm vet\u00ebm p\u00ebr flagjet \"-O3\" dhe \"-march-native\").\n<li class=\"l\"> Update-i i b\u00ebrtham\u00ebs Linux n\u00eb versionet 4.19 dhe 5.4 nuk ndikoi n\u00eb performanc\u00eb, p\u00ebrdorimi i planifikuesve SCHED_FIFO dhe SCHED_RR, manipulimet me sysctl kernel.sched_min_granularity_ns, kernel.sched_wakeup_granularity_ns, transparent_hugepages=never, skew_tick=1 dhe clocksource=tsc.\n<li class=\"l\"> N\u00eb drejtuesin ENA, aktivizimi i modusit Offload (fragmentimi, scatter-gather, rx\/tx checksum) nuk ka pasur ndikim, nd\u00ebrtimi me flagun \"-O3\" dhe p\u00ebrdorimi i parametrave ena.rx_queue_size dhe ena.force_large_llq_header.\n<li class=\"l\"> Ndryshimet n\u00eb stek-in e rrjetit nuk \u00e7uan n\u00eb rritjen e performanc\u00ebs:\n<ul>\n<li>\u00c7aktivizimi i IPv6: ipv6.disable=1<\/li>\n<li>\u00c7aktivizimi i VLAN: modprobe -rv 8021q<\/li>\n<li>\u00c7aktivizimi i verifikimit t\u00eb burimit t\u00eb paketave\n<ul>\n<li>net.ipv4.conf.all.rp_filter=0<\/li>\n<li>net.ipv4.conf.eth0.rp_filter=0<\/li>\n<li>net.ipv4.conf.all.accept_local=1 (efekti negativ)<\/li>\n<\/ul>\n<\/li>\n<li>net.ipv4.tcp_sack=0<\/li>\n<li>net.ipv4.tcp_dsack=0<\/li>\n<li>net.ipv4.tcp_mem\/tcp_wmem\/tcp_rmem <\/li>\n<li>net.core.netdev_budget<\/li>\n<li>net.core.dev_weight<\/li>\n<li>net.core.netdev_max_backlog<\/li>\n<li>net.ipv4.tcp_slow_start_after_idle=0 <\/li>\n<li>net.ipv4.tcp_moderate_rcvbuf=0<\/li>\n<li>net.ipv4.tcp_timestamps=0<\/li>\n<li>net.ipv4.tcp_low_latency=1<\/li>\n<li>SO_PRIORITY<\/li>\n<li>TCP_NODELAY<\/li>\n<\/ul>\n<p>Burimi: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=55186\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043e \u0434\u0435\u0442\u0430\u043b\u044c\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u0442\u044e\u043d\u0438\u043d\u0433\u0443 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f Linux \u0434\u043b\u044f \u0434\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u044f \u043c\u0430\u043a\u0441\u0438\u043c\u0430\u043b\u044c\u043d\u043e\u0439 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 HTTP-\u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432. \u041f\u0440\u0435\u0434\u043b\u043e\u0436\u0435\u043d\u043d\u044b\u0435 \u043c\u0435\u0442\u043e\u0434\u044b \u043f\u043e\u0437\u0432\u043e\u043b\u0438\u043b\u0438 \u043f\u043e\u0434\u043d\u044f\u0442\u044c \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u044c \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u0430 JSON \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 libreactor \u0432 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u0438 Amazon EC2 (4 vCPU) c 224 \u0442\u044b\u0441\u044f\u0447 \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 API \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0443 \u043f\u0440\u0438 \u0448\u0442\u0430\u0442\u043d\u044b\u0445 \u043d\u0430\u0441\u0442\u0440\u043e\u0439\u043a\u0430\u0445 Amazon Linux 2 \u0441 \u044f\u0434\u0440\u043e\u043c 4.14 \u0434\u043e 1.2 \u043c\u043b\u043d \u0437\u0430\u043f\u0440\u043e\u0441\u043e\u0432 \u0432 \u0441\u0435\u043a\u0443\u043d\u0434\u0443 \u043f\u043e\u0441\u043b\u0435 \u043f\u0440\u043e\u0432\u0435\u0434\u0435\u043d\u0438\u044f \u043e\u043f\u0442\u0438\u043c\u0438\u0437\u0430\u0446\u0438\u0438 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":100222,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-100221","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d\u043e \u0434\u0435\u0442\u0430\u043b\u044c\u043d\u043e\u0435 \u0440\u0443\u043a\u043e\u0432\u043e\u0434\u0441\u0442\u0432\u043e \u043f\u043e \u0442\u044e\u043d\u0438\u043d\u0433\u0443 \u043e\u043a\u0440\u0443\u0436\u0435\u043d\u0438\u044f Linux \u0434\u043b\u044f \u0434\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u044f 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