{"id":73426,"date":"2020-03-09T14:42:13","date_gmt":"2020-03-09T11:42:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha"},"modified":"2020-03-09T14:42:13","modified_gmt":"2020-03-09T11:42:13","slug":"reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha","status":"publish","type":"post","link":"https:\/\/prohoster.info\/da\/blog\/news\/reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha","title":{"rendered":"Udgivelsen af Memcached 1.6.0 med support for ekstern lagring er afsluttet","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Har fundet sted<\/a><\/noindex> betydelig udgivelse af datacache-systemet i hukommelsen Memcached 1.6.0<\/a><\/noindex>, som h\u00e5ndterer data i n\u00f8gle\/v\u00e6rdi-format og kendetegnes ved brugervenlighed. Memcached anvendes typisk som en letv\u00e6gtsl\u00f8sning til at accelerere ydeevnen p\u00e5 h\u00f8jbelastede websteder ved at cache adgangen til databaser og mellemliggende data. Kode leveres<\/a><\/noindex> under BSD-licensen.<\/p>\n

I den nye version er implementeringen af lageret stabiliseret «extstore<\/a><\/noindex>«, som nu samles som standard (der er en mulighed i konfigurationsscriptet «—disable-extstore» for at deaktivere det), men kr\u00e6ver eksplicit aktivering ved opstart (gamle installationer forts\u00e6tter med at fungere uden \u00e6ndringer efter opdatering). Selvom lageret «extstore» generelt anses for stabilt, anbefales det at udvise forsigtighed ved implementeringen i meget store systemer.<\/p>\n

Extstore g\u00f8r det muligt at bruge SSD\/Flash-drev til at udvide st\u00f8rrelsen af cachen. Ligesom n\u00e5r man bruger RAM, er lageret p\u00e5 Flash ikke permanent og nulstilles ved genstart. Anvendelsen af den nye tilstand n\u00e6vnes for at sikre effektiv caching af store data. Ved brug af «extstore» opbevares n\u00f8gler og metadata, som f\u00f8r, kun i RAM, men de store data relateret til n\u00f8gler, hvis st\u00f8rrelse overstiger den fastsatte gr\u00e6nse, gemmes i eksternt lager, og i RAM forbliver kun en pointer. <\/p>\n

Hvis der er knyttet data af lille st\u00f8rrelse til n\u00f8glen, fungerer Memcached som normalt, holder data i hukommelsen og henviser ikke til eksternt lager. Hvis der er meget ledig hukommelse, kan de mest efterspurgte data ogs\u00e5 helt befinde sig i cachen i RAM (f.eks. kan man angive, at kun objekter st\u00f8rre end 1024 byte, som ikke er blevet tilg\u00e5et i 3600 sekunder, skal nulstilles til Flash).<\/p>\n

Implementeringen er optimeret til at sikre maksimal ydeevne og minimal belastning p\u00e5 CPU'en, p\u00e5 bekostning af effektiviteten af lagringen (h\u00f8jt niveau af fragmentering). For at forl\u00e6nge levetiden for Flash-drev bufferes data og nulstilles sekventielt til lageret. For at bevare cachetilstanden mellem genstarter kan den i version 1.5.18 indf\u00f8rte mulighed for at nulstille dump af cachen til en fil anvendes. Ved n\u00e6ste opstart kan cachen gendannes fra denne fil for at undg\u00e5 spidser i belastningen p\u00e5 indholdsh\u00e5ndterere p\u00e5 grund af en tom cache (cachen bliver straks «varm»).<\/p>\n

Den anden vigtige \u00e6ndring i Memcached 1.6 var omarbejdningen af koden til netv\u00e6rk, som nu er tilpasset til automatisk at h\u00e5ndtere batch-anmodninger inden for et enkelt systemopkald. Tidligere, n\u00e5r flere 'GET'-kommandoer blev sendt i en enkelt TCP-pakke, sendte memcached resultaterne ved at udf\u00f8re separate systemopkald. I Memcached 1.6 aggregeres svarene og returneres ved at sende et enkelt systemopkald. Som et resultat har vi nu i gennemsnit 1,5 n\u00f8gler pr. systemopkald, hvilket i tests viser et fald i CPU-belastningen p\u00e5 op til 25 % og en reduktion af forsinkelsen med nogle procent.<\/p>\n

Oml\u00e6gningen af netv\u00e6rksundersystemet har ogs\u00e5 gjort det muligt at overg\u00e5 til dynamisk tildeling af buffere efter behov, i stedet for statisk tildeling af buffere. Denne optimering har reduceret hukommelsesforbruget i ventetid p\u00e5 nye kommandoer gennem et etableret klientforbindelse fra 4.5 KB til 400-500 byte, og har ogs\u00e5 givet mulighed for at slippe af med mange kald til malloc, realloc og free, som f\u00f8rer til un\u00f8dvendig fragmentering af hukommelsen p\u00e5 systemer med et stort antal forbindelser. Hver arbejdstr\u00e5de behandler nu sin egen pulje af buffere til l\u00e6sning og skrivning for aktive klient-forbindelser. For at justere st\u00f8rrelsen p\u00e5 disse buffere
\nder tilbydes mulighederne '-o resp_obj_mem_limit=N' og '-o read_buf_mem_limit=N'.<\/p>\n

I version 1.6 er der ogs\u00e5 blevet annonceret overgangen til at v\u00e6re for\u00e6ldet det bin\u00e6re protokol<\/a><\/noindex> til interaktion med serveren. Vedligeholdelse af det bin\u00e6re protokol og fejlrettelse vil forts\u00e6tte, men nye funktioner og opdateringer af eksisterende funktioner vil ikke blive overf\u00f8rt. Det tekstlige protokol<\/a><\/noindex> vil forts\u00e6tte udviklingen u\u00e6ndret. I stedet for det bin\u00e6re protokol er der kommet et nyt protokol meta<\/a><\/noindex> (den tekstlige version af protokollen med kompakte meta-kommandoer), der viser det optimale forhold mellem ydeevne og p\u00e5lidelighed. Det nye protokol d\u00e6kker alle operationer, der tidligere var tilg\u00e6ngelige via de tekstlige og bin\u00e6re protokoller.<\/p>\n

<\/a><\/noindex><\/p>\n

Kilde: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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\u0432\u0435\u0440\u0441\u0438\u0438 \u0441\u0442\u0430\u0431\u0438\u043b\u0438\u0437\u0438\u0440\u043e\u0432\u0430\u043d\u0430 \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f \u0445\u0440\u0430\u043d\u0438\u043b\u0438\u0449\u0430 «extstore«, \u043a\u043e\u0442\u043e\u0440\u043e\u0435 \u0442\u0435\u043f\u0435\u0440\u044c \u0441\u043e\u0431\u0438\u0440\u0430\u0435\u0442\u0441\u044f \u043f\u043e […]<\/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-73426","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Udgivelsen af 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