{"id":3459,"date":"2019-04-24T08:53:00","date_gmt":"2019-04-24T08:53:00","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/mom-he-blocked-threads-again\/"},"modified":"2026-04-24T11:21:40","modified_gmt":"2026-04-24T11:21:40","slug":"mamma-vins-blokeja-pavedieni-atkal","status":"publish","type":"post","link":"https:\/\/thecodest.co\/lv\/blog\/mom-he-blocked-threads-again\/","title":{"rendered":"MAMA! Vi\u0146\u0161 atkal blo\u0137\u0113ja pavedienus!"},"content":{"rendered":"<h2>Diegi<\/h2>\n<p>Galvenais, kas j\u0101atceras: ir divu veidu pavedieni. <strong><a href=\"https:\/\/thecodest.co\/lv\/blog\/find-your-node-js-expert-for-hire-today\/\">Node.js<\/a><\/strong>: Galvenais pavediens - ko apstr\u0101d\u0101 <b>Notikumu cilpa<\/b>, un <b>Darbinieku kopums<\/b> (pavedienu p\u016bls) - kas ir pavedienu p\u016bls -<br \/>\n<a href=\"http:\/\/docs.libuv.org\/en\/v1.x\/threadpool.html\" rel=\"nofollow\">paldies libuv<\/a>. Katram no vi\u0146iem ir at\u0161\u0137ir\u012bgs darbs. Pirm\u0101 uzdevums ir apstr\u0101d\u0101t neblo\u0137\u0113jo\u0161as I\/O oper\u0101cijas, bet otrais ir atbild\u012bgs par CPU intens\u012bvu darbu un ar\u012b blo\u0137\u0113jo\u0161\u0101m I\/O oper\u0101cij\u0101m.<\/p>\n<p><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/libuv.png\" alt=\"libuv diagramma\" title=\"libuv sast\u0101vda\u013cas\" \/><\/p>\n<p>Bet kas ir pavediens un ar ko tas at\u0161\u0137iras no procesa? At\u0161\u0137ir\u012bbas ir vair\u0101kas, bet vissvar\u012bg\u0101k\u0101 no t\u0101m ir t\u0101. <a href=\"https:\/\/thecodest.co\/lv\/blog\/why-us-companies-are-opting-for-polish-developers\/\">mums<\/a> ir tas, k\u0101 tiem tiek pie\u0161\u0137irta atmi\u0146a. Par procesu var dom\u0101t k\u0101 par lietojumprogrammu. Katra procesa iek\u0161ien\u0113 ir atmi\u0146a, kas paredz\u0113ta tikai \u0161im procesam. T\u0101tad vienam procesam nav piek\u013cuves otra procesa atmi\u0146ai, un \u0161\u012b \u012bpa\u0161\u012bba nodro\u0161ina augstu dro\u0161\u012bbu. Lai nodibin\u0101tu sazi\u0146u starp procesiem, mums ir j\u0101veic zin\u0101ms darbs. Pavedieni ir at\u0161\u0137ir\u012bgi. Pavedieni darbojas vien\u0101 proces\u0101 un koplieto vienu un to pa\u0161u atmi\u0146u, t\u0101p\u0113c nav nek\u0101du probl\u0113mu ar pavedienu koplieto\u0161anu. <a href=\"https:\/\/thecodest.co\/lv\/blog\/app-data-collection-security-risks-value-and-types-explored\/\">dati<\/a>.<\/p>\n<p>Tom\u0113r viens jaut\u0101jums rada probl\u0113mu. To sauc par sac\u012bk\u0161u st\u0101vokli. V\u012btnes var darboties vienlaic\u012bgi, tad k\u0101 m\u0113s varam zin\u0101t, kura beigsies pirm\u0101? Var gad\u012bties, ka pirmaj\u0101 palai\u0161anas reiz\u0113 pirm\u0101 oper\u0101cija beidzas pirm\u0101, bet n\u0101kamaj\u0101 reiz\u0113 var izr\u0101d\u012bties otr\u0101di un otr\u0101 oper\u0101cija beidzas pirms pirm\u0101s. Iedom\u0101jieties, k\u0101 \u0161\u0101dos apst\u0101k\u013cos var str\u0101d\u0101t ar rakst\u012b\u0161anas\/las\u012b\u0161anas oper\u0101cij\u0101m! Ko\u0161s murgs! Da\u017ereiz ir \u013coti gr\u016bti uzrakst\u012bt pareizu <a href=\"https:\/\/thecodest.co\/lv\/dictionary\/what-is-code-refactoring\/\">kods<\/a> daudzpavedienu vid\u0113.<\/p>\n<p>Turkl\u0101t daudzpavedienu valod\u0101m ir liela atmi\u0146as pieskait\u0101m\u012bba, jo t\u0101s katram piepras\u012bjumam izveido atsevi\u0161\u0137u pavedienu; t\u0101tad, ja v\u0113laties izsaukt 1000 piepras\u012bjumus, t\u0101s izveido 1000 pavedienus.<\/p>\n<p>K\u0101 risin\u0101t \u0161\u0101du probl\u0113mu? T\u0101 viet\u0101 izmantojiet vienu pavedienu! Un tas ir tas, ko <strong><a href=\"https:\/\/thecodest.co\/lv\/dictionary\/what-is-node-js-used-for\/\">Mezgls<\/a><\/strong> pied\u0101v\u0101.<\/p>\n<p><img decoding=\"async\" src=\"\/app\/uploads\/2024\/05\/eventloop.png\" alt=\"viena pavediena notikumu cikls\" title=\"notikumu cikla diagramma \" \/><\/p>\n<p>K\u0101 <strong><a href=\"https:\/\/thecodest.co\/lv\/blog\/hire-javascript-developer\/\">JavaScript izstr\u0101d\u0101t\u0101js<\/a><\/strong> Es aicinu j\u016bs noskat\u012bties <a href=\"https:\/\/youtu.be\/PNa9OMajw9w\" rel=\"nofollow\">filma<\/a><br \/>\nkur\u0101 B\u0101rts Belderis skaidri izskaidro notikumu cilpas j\u0113dzienu. Iepriek\u0161 min\u0113t\u0101 diagramma ir \u0146emta no vi\u0146a prezent\u0101cijas. Un, ja j\u016bs visp\u0101r nezin\u0101t \u0161os terminus, gan <strong>Mezgls<\/strong> un Libuv ir lieliska dokument\u0101cija \ud83d\ude42<\/p>\n<h2>Par blo\u0137\u0113\u0161anu<\/h2>\n<p>In <strong><a href=\"https:\/\/thecodest.co\/lv\/dictionary\/why-is-javascript-so-popular\/\">JavaScript<\/a> att\u012bst\u012bba<\/strong> nozare vi\u0146i saka, ka t\u0101p\u0113c, ka <strong>Mezgls<\/strong> ir vienpavedienu un bez blo\u0137\u0113\u0161anas, ar tiem pa\u0161iem resursiem var pan\u0101kt liel\u0101ku vienlaic\u012bgumu nek\u0101 ar daudzpavedienu risin\u0101jumiem. T\u0101 ir taisn\u012bba, bet tas nav tik skaisti un vienk\u0101r\u0161i, k\u0101 var\u0113tu \u0161\u0137ist.<\/p>\n<p>T\u0101 k\u0101 <strong>Node.js<\/strong> ir viena pavediena (<a href=\"https:\/\/thecodest.co\/lv\/blog\/hire-vue-js-developers\/\">JS<\/a> da\u013ca), CPU ietilp\u012bgi uzdevumi blo\u0137\u0113s visus notieko\u0161os piepras\u012bjumus, l\u012bdz konkr\u0113tais uzdevums tiks pabeigts. T\u0101tad ir taisn\u012bba, ka <strong>Node.js<\/strong> var blo\u0137\u0113t katru piepras\u012bjumu tikai t\u0101p\u0113c, ka vien\u0101 no tiem ir blo\u0137\u0113\u0161anas instrukcija. Blo\u0137\u0113\u0161anas kods noz\u012bm\u0113, ka t\u0101 izpildei ir nepiecie\u0161amas vair\u0101k nek\u0101 da\u017eas milisekundes. Ta\u010du nejauciet ilgu atbildes laiku ar blo\u0137\u0113\u0161anu. Atbilde no datub\u0101zes var aiz\u0146emt \u013coti ilgu laiku, bet tas neblo\u0137\u0113 j\u016bsu procesu (lietojumprogrammu).<\/p>\n<p>Blo\u0137\u0113\u0161anas metodes tiek izpild\u012btas sinhroni, bet neblo\u0137\u0113\u0161anas metodes tiek izpild\u012btas asinhroni.<\/p>\n<p>K\u0101 pal\u0113nin\u0101t (vai blo\u0137\u0113t) notikumu cilpu?<\/p>\n<ul>\n<li>neaizsarg\u0101ta regul\u0101r\u0101 izteiksme - neaizsarg\u0101ta regul\u0101r\u0101 izteiksme ir t\u0101, kurai j\u016bsu regul\u0101r\u0101s izteiksmes dzin\u0113js var aiz\u0146emt eksponenci\u0101lu laiku; par to varat las\u012bt vair\u0101k.  <a href=\"https:\/\/nodejs.org\/en\/docs\/guides\/dont-block-the-event-loop\/\" rel=\"nofollow\">\u0161eit<\/a>,<\/li>\n<li>JSON oper\u0101cijas ar lieliem objektiem,<\/li>\n<li>izmantojot sinhrono API no <strong>Mezgls <\/strong>kodola modu\u013cu asinhrono versiju viet\u0101; visas Node.js standarta bibliot\u0113kas I\/O metodes nodro\u0161ina ar\u012b asinhron\u0101s versijas,<\/li>\n<li>citas programm\u0113\u0161anas k\u013c\u016bdas, piem\u0113ram, sinhronas bezgal\u012bgas cilpas.<\/li>\n<\/ul>\n<p>Vai t\u0101d\u0101 gad\u012bjum\u0101, t\u0101 k\u0101 Worker Pool izmanto pavedienu kopumu, ir iesp\u0113jams blo\u0137\u0113t ar\u012b tos? Diem\u017e\u0113l j\u0101 \ud83d\ude41<strong> Mezgls<\/strong> ir balst\u012bta uz filozofiju. <code>viens pavediens daudziem klientiem.<\/code> Pie\u0146emsim, ka konkr\u0113tais uzdevums, ko veic konkr\u0113ts darbinieks, ir \u013coti sare\u017e\u0123\u012bts un t\u0101 izpildei nepiecie\u0161ams vair\u0101k laika. Rezult\u0101t\u0101 \u0161is Worker tiek blo\u0137\u0113ts, un to nevar izmantot neviena cita neizpild\u012bta uzdevuma izpildei, kam\u0113r nav izpild\u012bti t\u0101 nor\u0101d\u012bjumi. K\u0101 j\u016bs jau dro\u0161i vien nojau\u0161at, tas var ietekm\u0113t veiktsp\u0113ju. \u0160\u0101das probl\u0113mas var nov\u0113rst, samazinot uzdevumu izpildes laika sv\u0101rst\u012bbas, izmantojot uzdevumu dal\u012b\u0161anu.<\/p>\n<h2>Secin\u0101jums<\/h2>\n<p>Noteikti izvairieties no blo\u0137\u0113\u0161anas. Ja vien varat, vienm\u0113r izv\u0113lieties standarta bibliot\u0113kas API asinhron\u0101s versijas. Pret\u0113j\u0101 gad\u012bjum\u0101 p\u0113c j\u016bsu lietotnes palai\u0161anas klientam var rasties vair\u0101kas probl\u0113mas, s\u0101kot ar pazemin\u0101tu caurlaidsp\u0113ju un beidzot ar piln\u012bgu atteik\u0161anos, kas no lietot\u0101ja viedok\u013ca ir likten\u012bga.<\/p>\n<p><article-inline-code-review><\/article-inline-code-review><\/p>\n<p><b>Las\u012bt vair\u0101k:<\/b><\/p>\n<p><a href=\"https:\/\/thecodest.co\/blog\/why-you-should-probably-use-typescript\">K\u0101p\u0113c jums (iesp\u0113jams) vajadz\u0113tu izmantot Typescript<\/a><\/p>\n<p><a href=\"https:\/\/thecodest.co\/blog\/how-not-to-kill-a-project-with-bad-coding-practices\/\">K\u0101 nenogalin\u0101t projektu ar sliktu kod\u0113\u0161anas praksi?<\/a><\/p>\n<p><a href=\"https:\/\/thecodest.co\/blog\/data-fetching-strategies-in-nextjs\/\">Datu ieg\u016b\u0161anas strat\u0113\u0123ijas NextJS<\/a><\/p>","protected":false},"excerpt":{"rendered":"<p>\u201cNeblo\u0137\u0113jiet notikumu cilpu...\u201d - dro\u0161i vien esat \u0161o teikumu dzird\u0113ju\u0161i daudzas reizes... Mani tas nep\u0101rsteidz, jo tas ir viens no svar\u012bg\u0101kajiem pie\u0146\u0113mumiem, str\u0101d\u0101jot ar Node. Ta\u010du ir ar\u012b otra \u201clieta\u201d, kuru nevajadz\u0113tu blo\u0137\u0113t, - darba \u0146\u0113m\u0113ju p\u016bls. Ja tas tiek atst\u0101ts nov\u0101rt\u0101, tas var b\u016btiski ietekm\u0113t lietojumprogrammas veiktsp\u0113ju un pat t\u0101s dro\u0161\u012bbu.<\/p>","protected":false},"author":2,"featured_media":3460,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"footnotes":""},"categories":[8],"tags":[],"class_list":["post-3459","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.3 (Yoast SEO v27.3) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>MOM! 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Vi\u0146\u0161 atkal blo\u0137\u0113ja pavedienus! - The Codest","robots":{"index":"index","follow":"follow","max-snippet":"max-snippet:-1","max-image-preview":"max-image-preview:large","max-video-preview":"max-video-preview:-1"},"canonical":"https:\/\/thecodest.co\/lv\/emuars\/mamma-vins-blokeja-pavedieni-atkal\/","og_locale":"lv_LV","og_type":"article","og_title":"MOM! He Blocked Threads Again!","og_description":"\u201cDon`t block the event loop\u2026\u201d \u2013 you've probably heard this sentence many times\u2026 I'm not surprised because it is one of the most important assumptions when working with Node. But there is also a second \u201cthing\u201d which you should refrain from blocking \u2013 the Worker Pool. 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