{"id":36877,"date":"2019-10-31T22:14:28","date_gmt":"2019-10-31T19:14:28","guid":{"rendered":"https:\/\/prohoster.info\/blog\/yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati\/"},"modified":"2019-10-31T22:14:28","modified_gmt":"2019-10-31T19:14:28","slug":"yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/yadro-linux-ne-mozhet-myagko-obrabatyvat-situatsii-s-nehvatkoj-pamyati","title":{"rendered":"Linux-kernen kan ikke h\u00e5ndtere situationer med hukommelsesmangel blidt","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>I udviklergruppen for Linux-kernen er der rejst et sp\u00f8rgsm\u00e5l <noindex><a rel=\"nofollow\" href=\"https:\/\/lkml.org\/lkml\/2019\/8\/4\/15\">om<\/a><\/noindex> h\u00e5ndteringen af situationer med udt\u00f8mning af ledig hukommelse i Linux:<\/p>\n<blockquote>\n<p>Der er et velkendt problem, der har generet mange mennesker i mange \u00e5r, og som kan reproduceres p\u00e5 mindre end et par minutter p\u00e5 den nyeste version af Linux-kernen 5.2.6. Alle kernens parametre er indstillet til standardv\u00e6rdier.<\/p>\n<p>Steps:<\/p>\n<ul>\n<li class=\"l\"> Vi starter med parameteren \u00abmem=4G\u00bb.\n<li class=\"l\"> Vi deaktiverer swap-underst\u00f8ttelse (sudo swapoff -a).\n<li class=\"l\"> Vi \u00e5bner en hvilken som helst webbrowser, for eksempel Chrome\/Chromium eller Firefox.\n<li class=\"l\"> Vi begynder at \u00e5bne faner med websteder og ser, hvordan m\u00e6ngden af ledig hukommelse falder.\n<\/ul>\n<p>N\u00e5r der opst\u00e5r en situation, hvor en ny fane kr\u00e6ver mere RAM, end der er tilg\u00e6ngeligt, fryser systemet n\u00e6sten fuldst\u00e6ndigt. Du vil endda have sv\u00e6rt ved at bev\u00e6ge musen. Harddiskindikatoren vil blinke uden ophold (jeg ved ikke hvorfor). Du kan ikke starte nye programmer eller lukke de nuv\u00e6rende k\u00f8rende.<\/p>\n<p>Denne lille krise kan vare i minutter eller l\u00e6ngere. Jeg antager, at systemet ikke burde opf\u00f8re sig s\u00e5dan. Jeg tror, der er noget, der skal g\u00f8res for at undg\u00e5 s\u00e5dan nogle \u00abfrysninger\u00bb.<\/p>\n<p>Jeg er n\u00e6sten sikker p\u00e5, at man kan \u00e6ndre nogle sysctl-parametre for at undg\u00e5 s\u00e5danne situationer, men noget fort\u00e6ller mig, at dette kan g\u00f8res som standard for alle, fordi ikke-tekniske brugere, der st\u00f8der p\u00e5 dette problem, bare vil give op p\u00e5 at bruge Linux og ikke vil bruge tid p\u00e5 at lede efter l\u00f8sninger p\u00e5 Google.\n<\/p><\/blockquote>\n<p>I <noindex><a rel=\"nofollow\" href=\"https:\/\/www.reddit.com\/r\/linux\/comments\/cmg48b\/lets_talk_about_the_elephant_in_the_room_the\/\">kommentarer<\/a><\/noindex> P\u00e5 Reddit foresl\u00e5r nogle brugere at aktivere swap, men det l\u00f8ser ikke problemet, det uds\u00e6tter blot problemet og forv\u00e6rrer ofte situationen. En mulig fremtidig l\u00f8sning kan involvere den nyeste udvikling i kernen <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=49842\">4.20<\/a><\/noindex> og forbedringen i kernen <noindex><a rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51051\">5.2<\/a><\/noindex> PSI (Pressure Stall Information) subsystemet, der giver mulighed for at analysere information om ventetid for at f\u00e5 forskellige ressourcer (CPU, hukommelse, input\/output). Dette subsystem giver mulighed for at overv\u00e5ge mangel p\u00e5 hukommelse i et tidligt stadium, identificere kilden til problemerne og afslutte un\u00f8dvendige applikationer, uden at der opst\u00e5r m\u00e6rkbare effekter for brugeren. <\/p>\n<p><noindex><a rel=\"nofollow\" name=\"link\"><\/a><\/noindex><\/p>\n<p>Kilde: <a \ncontent=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=51231\">opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u0412 \u0441\u043f\u0438\u0441\u043a\u0435 \u0440\u0430\u0441\u0441\u044b\u043b\u043a\u0438 \u0440\u0430\u0437\u0440\u0430\u0431\u043e\u0442\u0447\u0438\u043a\u043e\u0432 \u044f\u0434\u0440\u0430 Linux \u043f\u043e\u0434\u043d\u044f\u0442\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0441 \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u043e\u0439 \u0441\u0438\u0442\u0443\u0430\u0446\u0438\u0438 \u0438\u0441\u0447\u0435\u0440\u043f\u0430\u043d\u0438\u044f \u0441\u0432\u043e\u0431\u043e\u0434\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 \u0432 Linux: \u0418\u0437\u0432\u0435\u0441\u0442\u043d\u0430 \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u0430, \u043a\u043e\u0442\u043e\u0440\u0430\u044f \u0434\u043e\u043d\u0438\u043c\u0430\u0435\u0442 \u043c\u043d\u043e\u0436\u0435\u0441\u0442\u0432\u043e \u043b\u044e\u0434\u0435\u0439 \u043d\u0430 \u043f\u0440\u043e\u0442\u044f\u0436\u0435\u043d\u0438\u0438 \u043c\u043d\u043e\u0433\u0438\u0445 \u043b\u0435\u0442 \u0438 \u043a\u043e\u0442\u043e\u0440\u0443\u044e \u043c\u043e\u0436\u043d\u043e \u0432\u043e\u0441\u043f\u0440\u043e\u0438\u0437\u0432\u0435\u0441\u0442\u0438 \u043c\u0435\u043d\u044c\u0448\u0435, \u0447\u0435\u043c \u0437\u0430 \u043d\u0435\u0441\u043a\u043e\u043b\u044c\u043a\u043e \u043c\u0438\u043d\u0443\u0442 \u043d\u0430 \u043f\u043e\u0441\u043b\u0435\u0434\u043d\u0435\u0439 \u0432\u0435\u0440\u0441\u0438\u0438 \u044f\u0434\u0440\u0430 Linux 5.2.6. \u0412\u0441\u0435 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u044b \u044f\u0434\u0440\u0430 \u0443\u0441\u0442\u0430\u043d\u043e\u0432\u043b\u0435\u043d\u044b \u0432 \u0437\u043d\u0430\u0447\u0435\u043d\u0438\u044f \u043f\u043e \u0443\u043c\u043e\u043b\u0447\u0430\u043d\u0438\u044e. \u0428\u0430\u0433\u0438: \u0417\u0430\u0433\u0440\u0443\u0436\u0430\u0435\u043c\u0441\u044f \u0441 \u043f\u0430\u0440\u0430\u043c\u0435\u0442\u0440\u043e\u043c &#171;mem=4G&#187;. \u0412\u044b\u043a\u043b\u044e\u0447\u0430\u0435\u043c [&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-36877","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One 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