{"id":3804,"date":"2022-02-17T10:11:03","date_gmt":"2022-02-17T10:11:03","guid":{"rendered":"http:\/\/the-codest.localhost\/blog\/ways-to-increase-your-rails-performance\/"},"modified":"2024-07-04T21:01:27","modified_gmt":"2024-07-04T21:01:27","slug":"tapoja-lisata-kiskojen-suorituskykya","status":"publish","type":"post","link":"https:\/\/thecodest.co\/fi\/blog\/ways-to-increase-your-rails-performance\/","title":{"rendered":"Kuinka lis\u00e4t\u00e4 Railsin suorituskyky\u00e4"},"content":{"rendered":"

Ruby First<\/strong><\/h2>\n\n\n\n

Ruby<\/a><\/strong> on vahvasti oliosuuntautunut kieli. Itse asiassa (l\u00e4hes) kaikki Ruby<\/strong> on objekti. Tarpeettomien objektien luominen voi aiheuttaa ohjelmallesi paljon ylim\u00e4\u00e4r\u00e4ist\u00e4 muistink\u00e4ytt\u00f6\u00e4, joten sit\u00e4 on v\u00e4ltett\u00e4v\u00e4.<\/p>\n\n\n\n

Eroa mitataan k\u00e4ytt\u00e4m\u00e4ll\u00e4 memory_profiler<\/a><\/em> helmi ja sis\u00e4\u00e4nrakennettu Benchmark-moduuli ajan suorituskyvyn mittaamiseen. <\/p>\n\n\n\n

K\u00e4yt\u00e4 bang! -metodeja merkkijonoille<\/strong><\/h2>\n\n\n\n
vaativat \"memory_profiler\"\n\nreport = MemoryProfiler.report do\ntiedot<\/a> = \"X\" * 1024 * 1024 * 100\ndata = data.downcase\nend\n\nreport.pretty_print<\/code><\/pre>\n\n\n\n
Alla olevassa luettelossa luotiin 100 Mt:n merkkijono ja v\u00e4hennettiin jokainen sen sis\u00e4lt\u00e4m\u00e4 merkki. Vertailulaskelmamme antaa us<\/a> seuraava kertomus:<\/p>\n\n\n\n
Yhteens\u00e4 my\u00f6nnetty: 210765044 tavua (6 objektia)<\/em><\/p>\n\n\n\n
Jos kuitenkin korvataan rivi 6 seuraavasti:<\/p>\n\n\n\n
data.downcase!<\/code><\/code><\/pre>\n\n\n\n
 <\/code><\/p>\n\n\n\n
Lue tiedostoja rivi rivilt\u00e4<\/strong><\/h2>\n\n\n\n
Oletettavasti meid\u00e4n on haettava valtava 2 miljoonan tietueen kokoelma csv-tiedostosta. Tyypillisesti se n\u00e4ytt\u00e4isi t\u00e4lt\u00e4:<\/p>\n\n\n\n
vaatia 'benchmark'\n\nBenchmark.bm do |x|\nx.report do\nFile.readlines(\"2mrecords.csv\").map! {|line| line.split(\",\")}\nend\nend<\/code><\/pre>\n\n\n\n
k\u00e4ytt\u00e4j\u00e4 j\u00e4rjestelm\u00e4 yhteens\u00e4 todellinen\n\n12.797000 2.437000 15.234000 (106.319865)<\/code><\/pre>\n\n\n\n
Tiedoston lataaminen kokonaisuudessaan kesti yli 106 sekuntia. Aika paljon! Voimme kuitenkin nopeuttaa t\u00e4t\u00e4 prosessia korvaamalla tiedoston kartta!<\/em> menetelm\u00e4 yksinkertaisella kun taas<\/em> silmukka:<\/p>\n\n\n\n
vaatia 'benchmark'\n\nBenchmark.bm do |x|\nx.report do\nfile = File.open(\"2mrecords.csv\", \"r\")\nwhile line = file.gets\nline.split(\",\")\nend\nend\nend<\/code><\/pre>\n\n\n\n
k\u00e4ytt\u00e4j\u00e4 j\u00e4rjestelm\u00e4 yhteens\u00e4 todellinen\n\n6.078000 0.250000 6.328000 ( 6.649422)<\/code><\/pre>\n\n\n\n
Juoksuaika on nyt laskenut huomattavasti, koska kartta!<\/em> menetelm\u00e4 kuuluu tiettyyn luokkaan, kuten Hash#map<\/em> tai Array#map<\/em>, jossa Ruby<\/strong> tallentaa jokaisen j\u00e4sennetyn tiedoston rivin muistiin niin kauan kuin se suoritetaan. Rubyn roskienker\u00e4\u00e4j\u00e4 <\/strong>ei vapauta muistia ennen kuin iteraattorit on suoritettu kokonaan. Sen lukeminen rivi rivilt\u00e4 kuitenkin GC:n avulla siirt\u00e4\u00e4 muistia edellisilt\u00e4 riveilt\u00e4, kun se ei ole tarpeen.<\/p>\n\n\n\n
V\u00e4lt\u00e4 menetelmien iteraattoreita suuremmissa kokoelmissa<\/strong><\/h2>\n\n\n\n
T\u00e4m\u00e4 on jatkoa edelliselle kohdalle, ja esimerkkin\u00e4 on yleisempi esimerkki. Kuten mainitsin, Ruby<\/a> iteraattorit ovat objektimetodeja, eiv\u00e4tk\u00e4 ne vapauta muistia niin kauan kuin niit\u00e4 suoritetaan. Pieness\u00e4 mittakaavassa ero on merkitykset\u00f6n (ja metodit kuten esim. kartta<\/em> vaikuttaa luettavammalta). Suurempien tietokokonaisuuksien kohdalla on kuitenkin aina syyt\u00e4 harkita sen korvaamista yksinkertaisemmilla silmukoilla. Kuten alla olevassa esimerkiss\u00e4:<\/p>\n\n\n\n
numberofelements = 10000000\nrandoms = Array.new(numberofelements) { rand(10) }\n\nrandoms.each do |line|\n#ehd\u00e4 jotain\nend<\/code><\/pre>\n\n\n\n
ja refaktoroinnin j\u00e4lkeen:<\/p>\n\n\n\n
numberofelements = 10000000\nrandoms = Array.new(numberofelements) { rand(10) }\n\nwhile randoms.count > 0\nline = randoms.shift\n#ehd\u00e4 jotain\nend\n\"`<\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
K\u00e4yt\u00e4 String::<< -menetelm\u00e4\u00e4<\/strong><\/h2>\n\n\n\n
T\u00e4m\u00e4 on nopea mutta erityisen hy\u00f6dyllinen vinkki. Jos liit\u00e4t yhden merkkijonon toiseen k\u00e4ytt\u00e4m\u00e4ll\u00e4 +=-operaattoria taustalla. Ruby <\/strong> luo ylim\u00e4\u00e4r\u00e4isen objektin. Joten t\u00e4m\u00e4:\u00a0<\/p>\n\n\n\n
 a = \"X\"\n b = \"Y\"\n a += b<\/code><\/code><\/pre>\n\n\n\n
Tarkoittaa oikeastaan t\u00e4t\u00e4:<\/p>\n\n\n\n
 a = \"X\"\n b = \"Y\"\n c = a + b\n a = c<\/code><\/code><\/pre>\n\n\n\n
Operaattori v\u00e4ltt\u00e4isi sen ja s\u00e4\u00e4st\u00e4isi muistia:<\/p>\n\n\n\n
 a = \"X\"\n b = \"Y\"\n a << b<\/code><\/code><\/code><\/pre>\n\n\n\n
<\/p>\n\n\n\n
Puhutaan Railsista<\/strong><\/h2>\n\n\n\n
The Rails-kehys <\/strong> on runsaasti \"gotchas<\/em>\", jonka avulla voit optimoida koodi<\/a> nopeasti ja ilman suurempia lis\u00e4ponnistuksia. <\/p>\n\n\n\n
Eager Loading eli n+1-kyselyongelma.<\/strong><\/h2>\n\n\n\n
Oletetaan, ett\u00e4 meill\u00e4 on kaksi toisiinsa liittyv\u00e4\u00e4 mallia, Post ja Author:<\/p>\n\n\n\n
class Author < ApplicationRecord\nhas_many :posts\nend\n\nclass Post < ApplicationRecord\nbelongs_to :author\nend<\/code><\/pre>\n\n\n\n
Haluamme noutaa kaikki viestit ohjaimessamme ja n\u00e4ytt\u00e4\u00e4 ne n\u00e4kym\u00e4ss\u00e4 tekij\u00f6ineen:<\/p>\n\n\n\n
ohjain\n\ndef index\n@posts = Post.all.limit(20)\nend\n\nview<\/code><\/pre>\n\n\n\n
Ohjaimessa, ActiveRecord<\/a> luo vain yhden kyselyn, jolla l\u00f6yd\u00e4mme viestit. My\u00f6hemmin se k\u00e4ynnist\u00e4\u00e4 kuitenkin viel\u00e4 20 muuta kysely\u00e4 kunkin kirjoittajan l\u00f6yt\u00e4miseksi, mik\u00e4 vie ylim\u00e4\u00e4r\u00e4ist\u00e4 aikaa! Onneksi Railsissa on nopea ratkaisu n\u00e4iden kyselyjen yhdist\u00e4miseen yhdeksi kyselyksi. K\u00e4ytt\u00e4m\u00e4ll\u00e4 sis\u00e4lt\u00e4\u00e4<\/em> metodia, voimme kirjoittaa ohjaimemme uudelleen n\u00e4in:<\/p>\n\n\n\n
 def index\n     @posts = Post.all.includes(:author).limit(20)\n end<\/code><\/code><\/pre>\n\n\n\n
Toistaiseksi vain tarvittavat tiedot haetaan yhteen kyselyyn.\u00a0<\/p>\n\n\n\n
Voit k\u00e4ytt\u00e4\u00e4 my\u00f6s muita jalokivi\u00e4, kuten esim. bullet<\/a> muokata koko prosessia.<\/p>\n\n\n\n
Soita vain mit\u00e4 tarvitset<\/strong><\/h2>\n\n\n\n
Toinen k\u00e4ytt\u00f6kelpoinen tekniikka ActiveRecordin nopeuden lis\u00e4\u00e4miseksi on kutsua vain niit\u00e4 attribuutteja, jotka ovat v\u00e4ltt\u00e4m\u00e4tt\u00f6mi\u00e4 t\u00e4m\u00e4nhetkisen k\u00e4ytt\u00f6tarkoituksesi kannalta. T\u00e4m\u00e4 on erityisen hy\u00f6dyllist\u00e4, kun sovelluksesi alkaa kasvaa ja taulukkokohtaisten sarakkeiden m\u00e4\u00e4r\u00e4 kasvaa.<\/p>\n\n\n\n
Otetaan edellinen koodimme esimerkkin\u00e4 ja oletetaan, ett\u00e4 meid\u00e4n on valittava vain nimet kirjoittajista. Voimme siis kirjoittaa ohjaimemme uudelleen:<\/p>\n\n\n\n
 def index\n     @posts = Post.all.includes(:author).select(\"name\").limit(20)\n end<\/code><\/code><\/code><\/pre>\n\n\n\n
Nyt annamme ohjaimellemme ohjeen ohittaa kaikki muut attribuutit paitsi sen, jota tarvitsemme.<\/p>\n\n\n\n
Render\u00f6i osatekij\u00e4t oikein<\/strong><\/h2>\n\n\n\n
Oletetaan, ett\u00e4 haluamme luoda erillisen osittaisen osion edellisiss\u00e4 esimerkeiss\u00e4 mainituille viesteillemme:<\/p>\n\n\n\n
\n<\/code><\/code><\/code><\/code><\/pre>\n\n\n\n
Ensi silm\u00e4yksell\u00e4 t\u00e4m\u00e4 koodi n\u00e4ytt\u00e4\u00e4 oikealta. Kun render\u00f6it\u00e4vien viestien m\u00e4\u00e4r\u00e4 on kuitenkin suurempi, koko prosessi on huomattavasti hitaampi. T\u00e4m\u00e4 johtuu siit\u00e4, ett\u00e4 Kiskot <\/strong> kutsuu osittaisen toistomme uudella iteraatiolla j\u00e4lleen kerran. Voimme korjata sen k\u00e4ytt\u00e4m\u00e4ll\u00e4 kokoelmat<\/em> ominaisuus:<\/p>\n\n\n\n
<\/code><\/code><\/code><\/code><\/pre>\n\n\n\n
Nyt, Kiskot<\/strong> selvitt\u00e4\u00e4 automaattisesti, mit\u00e4 mallia tulisi k\u00e4ytt\u00e4\u00e4, ja alustaa sen vain kerran.<\/p>\n\n\n\n
K\u00e4yt\u00e4 taustak\u00e4sittely\u00e4<\/strong><\/h2>\n\n\n\n
Jokainen prosessi, joka on aikaa viev\u00e4mpi eik\u00e4 ole ratkaisevan t\u00e4rke\u00e4 nykyiselle prosessivirrallesi, voidaan katsoa sopivaksi taustak\u00e4sittelyyn, esimerkiksi s\u00e4hk\u00f6postien l\u00e4hett\u00e4minen, tilastojen ker\u00e4\u00e4minen tai s\u00e4\u00e4nn\u00f6llisten raporttien laatiminen. <\/p>\n\n\n\n
Sidekiq<\/strong> on yleisimmin k\u00e4ytetty helmi taustak\u00e4sittelyyn. Se k\u00e4ytt\u00e4\u00e4 Redis<\/strong> teht\u00e4vien tallentamiseen. Sen avulla voit my\u00f6s hallita taustaprosessien kulkua, jakaa ne erillisiin jonoihin ja hallita muistin k\u00e4ytt\u00f6\u00e4 kunkin prosessin osalta.<\/p>\n\n\n\n
Kirjoita v\u00e4hemm\u00e4n koodia, k\u00e4yt\u00e4 enemm\u00e4n helmi\u00e4<\/strong><\/h2>\n\n\n\n
Kiskot <\/strong> keksi valtava m\u00e4\u00e4r\u00e4 helmi\u00e4, jotka eiv\u00e4t ainoastaan tee el\u00e4m\u00e4st\u00e4si helpompaa ja nopeuttaa kehitysprosessi<\/a>, mutta lis\u00e4\u00e4 my\u00f6s sovelluksesi suorituskyvyn nopeutta. Devisen tai Punditin kaltaiset jalokivet ovat yleens\u00e4 hyvin testattuja nopeutensa suhteen ja toimivat nopeammin ja varmemmin kuin samaa tarkoitusta varten r\u00e4\u00e4t\u00e4l\u00f6ity koodi.<\/p>\n\n\n\n
Jos sinulla on kysytt\u00e4v\u00e4\u00e4 Railsin suorituskyky<\/em>, reach Codest-insin\u00f6\u00f6rit<\/a><\/strong> ulos kuulemaan ep\u00e4ilyksi\u00e4si.<\/p>\n\n\n\n
\"Ruby-kehitt\u00e4j\u00e4<\/a><\/figure>\n\n\n\n
Lue lis\u00e4\u00e4:<\/strong><\/p>\n\n\n\n
Ruby-ohjelmistokehityksen hyv\u00e4t ja huonot puolet<\/a><\/p>\n\n\n\n
Kiskot ja muut liikennev\u00e4lineet<\/a><\/p>\n\n\n\n
Rails-kehitys TMUX, Vim, Fzf + Ripgrep -ohjelmilla<\/a><\/p>","protected":false},"excerpt":{"rendered":"
Lukuisista eduistaan huolimatta Ruby on Rails:t\u00e4 pidet\u00e4\u00e4n edelleen suhteellisen hitaana web-kehyksen\u00e4. Me kaikki tied\u00e4mme, ett\u00e4 Twitter on j\u00e4tt\u00e4nyt Railsin Scalan hyv\u00e4ksi. Muutamalla n\u00e4pp\u00e4r\u00e4ll\u00e4 parannuksella voit kuitenkin ajaa sovelluksesi huomattavasti nopeammin!<\/p>","protected":false},"author":2,"featured_media":3805,"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-3804","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-software-development"],"acf":[],"yoast_head":"\nHow to Increase Rails Performance - The Codest<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/thecodest.co\/fi\/blogi\/tapoja-lisata-kiskojen-suorituskykya\/\" \/>\n<meta property=\"og:locale\" content=\"fi_FI\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to Increase Rails Performance\" \/>\n<meta property=\"og:description\" content=\"Despite its numerous advantages, Ruby on Rails is still considered to be a relatively slow web framework. We all know that Twitter has left Rails in favor of Scala. 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