{"id":54872,"date":"2020-01-06T00:00:00","date_gmt":"2020-01-05T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti"},"modified":"2020-02-18T14:02:55","modified_gmt":"2020-02-18T11:02:55","slug":"linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","status":"publish","type":"post","link":"https:\/\/prohoster.info\/hu\/blog\/news\/linus-torvalds-oproverg-problemy-s-planirovshhikom-zadach-vsplyvshie-v-teste-proizvoditelnosti","title":{"rendered":"Linus Torvalds c\u00e1folta a teljes\u00edtm\u00e9nyteszt sor\u00e1n felmer\u00fclt feladat\u00fctemez\u0151 probl\u00e9m\u00e1kat","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>J\u00e1t\u00e9kfejleszt\u0151 Malte Skarupke <noindex><a rel=\"nofollow\" href=\"https:\/\/probablydance.com\/2019\/12\/30\/measuring-mutexes-spinlocks-and-how-bad-the-linux-scheduler-really-is\/\">k\u00f6zz\u00e9tett<\/a><\/noindex> a blokkol\u00e1sok teljes\u00edtm\u00e9ny\u00e9nek \u00f6sszehasonl\u00edt\u00e1sa alapj\u00e1n <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/%D0%9C%D1%8C%D1%8E%D1%82%D0%B5%D0%BA%D1%81\">Mutex<\/a><\/noindex> \u00e9s <noindex><a rel=\"nofollow\" href=\"https:\/\/ru.wikipedia.org\/wiki\/Spinlock\">Spinlock<\/a><\/noindex> k\u00fcl\u00f6nb\u00f6z\u0151 feladat\u00fctemez\u0151k haszn\u00e1lata mellett. A tesztek abnorm\u00e1lisan nagy k\u00e9sleltet\u00e9seket mutattak ki Spinlock eset\u00e9n, a Linux alap\u00e9rtelmezett feladat\u00fctemez\u0151j\u00e9vel. A teszt szerz\u0151je arra az k\u00f6vetkeztet\u00e9sre jutott, hogy a Linux feladat\u00fctemez\u0151 probl\u00e9m\u00e1kkal k\u00fczd, amelyek kedvez\u0151tlen\u00fcl befoly\u00e1solj\u00e1k a Google Stadia szolg\u00e1ltat\u00e1s\u00e1hoz k\u00e9sz\u00fclt j\u00e1t\u00e9kok teljes\u00edtm\u00e9ny\u00e9t, ahol a j\u00e1t\u00e9kok a GPU-n, felh\u0151alap\u00fa k\u00f6rnyezetben futnak, \u00e9s a kliens sz\u00e1m\u00e1ra csak a k\u00e9perny\u0151tartalom streamel\u00e9se t\u00f6rt\u00e9nik, legfeljebb 60 k\u00e9pkocka m\u00e1sodpercenk\u00e9nt. Ilyen k\u00f6r\u00fclm\u00e9nyek k\u00f6z\u00f6tt fontos a k\u00e9pkock\u00e1k id\u0151ben t\u00f6rt\u00e9n\u0151 megjelen\u00edt\u00e9se, \u00e9s az egy millisekund\u00e1n\u00e1l hosszabb k\u00e9sleltet\u00e9sek \u00e9szlelhet\u0151k.<\/p>\n<p>A tesztek megvitat\u00e1sa <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189723\">csatlakozott<\/a><\/noindex> Linus Torvalds, aki ezt a szemetess\u00e9gk\u00e9nt (&#171;pure garbage&#187;) \u00e9s p\u00e9ldak\u00e9nt eml\u00edtette arra, hogy milyen m\u00f3don szerezhet\u00fcnk olyan eredm\u00e9nyeket, amelyek nem t\u00fckr\u00f6zik a val\u00f3s\u00e1got, an\u00e9lk\u00fcl, hogy a t\u00e9ma m\u00e9ly\u00e9re \u00e1sn\u00e1nk. A spinlock egy alacsony szint\u0171 primit\u00edv, amit a felhaszn\u00e1l\u00f3i t\u00e9rben nagy \u00f3vatoss\u00e1ggal kell haszn\u00e1lni, \u00e9s teljes m\u00e9rt\u00e9kben meg kell \u00e9rteni a r\u00e9szleteket; k\u00fcl\u00f6nben olyan eredm\u00e9nyt kaphatunk, mint amit a teszt szerz\u0151je bemutatott. Linus azt tan\u00e1csolta a j\u00e1t\u00e9kfejleszt\u0151knek, hogy ne alkalmazzanak spinlock-ot, \u00e9s ne pr\u00f3b\u00e1ljanak saj\u00e1t z\u00e1rol\u00e1si rendszereket \u00e9p\u00edteni r\u00e1, hanem haszn\u00e1lj\u00e1k a megl\u00e9v\u0151, bev\u00e1lt mechanizmusokat, amelyek t\u00e1j\u00e9koztatj\u00e1k a rendszert a z\u00e1rol\u00e1s felszabad\u00edt\u00e1s\u00e1nak v\u00e1rakoz\u00e1s\u00e1r\u00f3l, hogy elker\u00fclj\u00e9k a tervez\u0151 hat\u00e1s\u00e1t. <\/p>\n<p>A spinlock alap\u00fa keretrendszereket csak teljes meggy\u0151z\u0151d\u00e9ssel lehet haszn\u00e1lni, hogy a tervez\u0151 nem szak\u00edtja meg a v\u00e9grehajt\u00e1sukat. A tesztekben alkalmazott spinlock alap\u00fa blokkol\u00e1sok saj\u00e1t k\u00e9sz\u00edt\u00e9s\u0171, a felhaszn\u00e1l\u00f3i t\u00e9rben m\u0171k\u00f6d\u0151 kereten kereszt\u00fcl val\u00f3sulnak meg. A feladatkezel\u0151 b\u00e1rmikor \u00e1tveheti az ir\u00e1ny\u00edt\u00e1st ennek a keretnek a v\u00e9grehajt\u00e1sa sor\u00e1n, \u00e9s \u00e1tt\u00e9rhet egy m\u00e1sik feladat v\u00e9grehajt\u00e1s\u00e1ra. Mivel a teljes\u00edtm\u00e9nym\u00e9r\u00e9s abszol\u00fat id\u0151\u00e9rt\u00e9kek alapj\u00e1n t\u00f6rt\u00e9nik, a tesztekben szerepl\u0151 k\u00e9sleltet\u00e9sek nemcsak a z\u00e1rol\u00e1s kezel\u0151j\u00e9n\u00e9l m\u00e9rt k\u00e9sleltet\u00e9seket \u00f6lelik fel, hanem a m\u00e1s kontextusban v\u00e9grehajtott k\u00f3dot is, azaz nemcsak azt m\u00e9rik, amit a teszt szerz\u0151je pr\u00f3b\u00e1lt m\u00e9rni, hanem a rendszerben zajl\u00f3 egy\u00e9b sz\u00e1m\u00edt\u00e1sokb\u00f3l sz\u00e1rmaz\u00f3 &#171;zaj&#187;-t is.<\/p>\n<p>A teszt szerz\u0151je <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189747\">attempted<\/a><\/noindex> L\u00ednusnak ellentmondva r\u00e1mutatott arra, hogy a spinlock alap\u00fa saj\u00e1t blokkol\u00f3 rendszerek alkalmaz\u00e1sa a gyakorlatban gyakran haszn\u00e1latos j\u00e1t\u00e9kokban, mivel a Linuxn\u00e1l egyszer\u0171bb \u00fctemez\u0151k alkalmaz\u00e1sakor a tesztek magasabb teljes\u00edtm\u00e9nyt mutatnak. L\u00ednus <noindex><a rel=\"nofollow\" href=\"https:\/\/www.realworldtech.com\/forum\/?threadid=189711&#038;curpostid=189752\">ellentmondott<\/a><\/noindex>, hogy a Linux \u00fctemez\u0151 univerz\u00e1lis, \u00e9vtizedek \u00f3ta csiszolj\u00e1k, \u00e9s nemcsak az asztali g\u00e9pek \u00e9s j\u00e1t\u00e9kok, hanem m\u00e1s terhel\u00e9sek, p\u00e9ld\u00e1ul a szerverrendszerek sz\u00e1m\u00e1ra is optimaliz\u00e1lva van, ez\u00e9rt sok szempontot figyelembe vesz a feladatok v\u00e9grehajt\u00e1s\u00e1nak \u00fctemez\u00e9sekor. <\/p>\n<p>Olyan specifikus optimaliz\u00e1l\u00e1sok hozz\u00e1ad\u00e1sa, amelyek cs\u00f6kkenthetik a Google Stadia j\u00e1t\u00e9kainak k\u00e9sleltet\u00e9s\u00e9t, n\u00f6velhetik a reakci\u00f3k\u00e9pess\u00e9get az adott esetben, de val\u00f3sz\u00edn\u0171leg a teljes \u00fctemez\u0151 hat\u00e9konys\u00e1g\u00e1nak cs\u00f6kken\u00e9s\u00e9hez vezetnek. P\u00e9ld\u00e1ul a Windows \u00fctemez\u0151je a sz\u00f3ban forg\u00f3 tesztekben jobban teljes\u00edt, mivel jelent\u0151sen egyszer\u0171bb, mint a Linux \u00fctemez\u0151je, \u00e9s f\u0151k\u00e9nt asztali feladatra optimaliz\u00e1lt\u00e1k.<\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Forr\u00e1s: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=52140\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u0438\u0433\u0440 Malte Skarupke \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435 \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438 \u0431\u043b\u043e\u043a\u0438\u0440\u043e\u0432\u043e\u043a \u043d\u0430 \u043e\u0441\u043d\u043e\u0432\u0435 Mutex \u0438 Spinlock \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 \u0440\u0430\u0437\u043b\u0438\u0447\u043d\u044b\u0445 \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u0432 \u0437\u0430\u0434\u0430\u0447. \u0422\u0435\u0441\u0442\u044b \u043f\u043e\u043a\u0430\u0437\u0430\u043b\u0438 \u0430\u043d\u043e\u043c\u0430\u043b\u044c\u043d\u043e \u0431\u043e\u043b\u044c\u0448\u0438\u0435 \u0437\u0430\u0434\u0435\u0440\u0436\u043a\u0438 \u043f\u0440\u0438 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u0438 Spinlock \u0441 \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u0443\u0435\u043c\u044b\u043c \u0432 Linux \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u043e\u043c \u0437\u0430\u0434\u0430\u0447. \u0410\u0432\u0442\u043e\u0440 \u0442\u0435\u0441\u0442\u043e\u0432 \u0441\u0434\u0435\u043b\u0430\u043b \u0432\u044b\u0432\u043e\u0434, \u0447\u0442\u043e \u043f\u043b\u0430\u043d\u0438\u0440\u043e\u0432\u0449\u0438\u043a \u0437\u0430\u0434\u0430\u0447 Linux \u0438\u043c\u0435\u0435\u0442 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b, \u043a\u043e\u0442\u043e\u0440\u044b\u0435 \u043d\u0435\u0433\u0430\u0442\u0438\u0432\u043d\u043e \u0441\u043a\u0430\u0437\u044b\u0432\u0430\u044e\u0442\u0441\u044f \u043d\u0430 \u0440\u0430\u0431\u043e\u0442\u0435 \u0438\u0433\u0440, \u0441\u043e\u0437\u0434\u0430\u0432\u0430\u0435\u043c\u044b\u0445 \u0434\u043b\u044f \u0441\u0435\u0440\u0432\u0438\u0441\u0430 Google Stadia, [&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":[702],"tags":[],"class_list":["post-54872","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.3 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u0420\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a \u0438\u0433\u0440 Malte Skarupke \u043e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043b \u0441\u0440\u0430\u0432\u043d\u0435\u043d\u0438\u0435.\" \/>\n\t<meta name=\"robots\" content=\"max-image-preview:large\" \/>\n\t<meta name=\"author\" content=\"Yuri Gagarin\"\/>\n\t<link rel=\"canonical\" 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