{"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\/sk\/blog\/news\/reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha","title":{"rendered":"Vydanie Memcached 1.6.0 s podporou extern\u00e9ho \u00falo\u017eiska","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Sa uskuto\u010dnilo<\/a><\/noindex> v\u00fdznamn\u00e1 verzia syst\u00e9mu vyrovn\u00e1vacej pam\u00e4te v pam\u00e4ti Memcached 1.6.0<\/a><\/noindex>, ktor\u00fd operuje s \u00fadajmi vo form\u00e1te k\u013e\u00fa\u010d\/hodnota a vynik\u00e1 jednoduch\u00fdm pou\u017e\u00edvan\u00edm. Memcached sa zvy\u010dajne pou\u017e\u00edva ako \u013eahk\u00e9 rie\u0161enie na zr\u00fdchlenie prev\u00e1dzky vysoko za\u0165a\u017een\u00fdch webov\u00fdch str\u00e1nok cez cacheovanie pr\u00edstupu k DBMS a medzi\u00falo\u017en\u00fdm \u00fadajom. K\u00f3d dod\u00e1va sa<\/a><\/noindex> pod licenciou BSD.<\/p>\n

V novej verzii bola stabilizovan\u00e1 implement\u00e1cia \u00falo\u017eiska «extstore<\/a><\/noindex>«, ktor\u00e9 sa teraz zhroma\u017e\u010fuje ako predvolen\u00e9 (mo\u017enos\u0165 «—disable-extstore» je zahrnut\u00e1 pre vypnutie v skripte configure), ale vy\u017eaduje jasn\u00fa aktiv\u00e1ciu pri spusten\u00ed (star\u00e9 in\u0161tal\u00e1cie po aktualiz\u00e1cii bud\u00fa pokra\u010dova\u0165 v pr\u00e1ci bez zmien). Napriek tomu, \u017ee vo v\u0161eobecnosti je \u00falo\u017eisko «extstore» pova\u017eovan\u00e9 za stabiln\u00e9, odpor\u00fa\u010da sa by\u0165 opatrn\u00fd pri jeho nasadzovan\u00ed v ve\u013emi ve\u013ek\u00fdch syst\u00e9moch.<\/p>\n

Extstore umo\u017e\u0148uje pou\u017e\u00edva\u0165 SSD\/Flash \u00falo\u017eisk\u00e1 na roz\u0161\u00edrenie ve\u013ekosti cache. Rovnako ako pri pou\u017eit\u00ed opera\u010dnej pam\u00e4te, \u00falo\u017eisko na Flash nie je trval\u00e9 a vyma\u017ee sa pri re\u0161tarte. Ako oblasti pou\u017eitia nov\u00e9ho re\u017eimu sa uv\u00e1dza efekt\u00edvne cacheovanie ve\u013ek\u00fdch d\u00e1t. Pri pou\u017eit\u00ed «extstore» k\u013e\u00fa\u010de a metadata, ako doteraz, zost\u00e1vaj\u00fa iba v opera\u010dnej pam\u00e4ti, ale s k\u013e\u00fa\u010dmi s\u00favisiace ve\u013ek\u00e9 d\u00e1ta, ktor\u00fdch ve\u013ekos\u0165 presahuje stanoven\u00fd limit, sa ukladaj\u00fa do extern\u00e9ho \u00falo\u017eiska, a v RAM zost\u00e1va iba ukazovate\u013e. <\/p>\n

Ak sa s k\u013e\u00fa\u010dom spoja d\u00e1ta malej ve\u013ekosti, Memcached funguje ako obvykle, udr\u017euje d\u00e1ta v pam\u00e4ti a neobr\u00e1ti sa na extern\u00e9 \u00falo\u017eisko. Ak je v pam\u00e4ti dostatok miesta, naj\u017eiadanej\u0161ie d\u00e1ta m\u00f4\u017eu by\u0165 navy\u0161e \u00faplne v cache v opera\u010dnej pam\u00e4ti (napr\u00edklad je mo\u017en\u00e9 ur\u010di\u0165, aby sa na Flash ukladali iba objekty v\u00e4\u010d\u0161ie ako 1024 bajtov, ku ktor\u00fdm nebolo pr\u00edstup 3600 sek\u00fand»).<\/p>\n

Implement\u00e1cia je optimalizovan\u00e1 na zabezpe\u010denie maxim\u00e1lneho v\u00fdkonu a minim\u00e1lneho za\u0165a\u017eenia CPU na \u00fakor efektivity ukladania (vysok\u00e1 \u00farove\u0148 fragment\u00e1cie). Na pred\u013a\u017eenie \u017eivotnosti Flash \u00falo\u017e\u00edsk s\u00fa d\u00e1ta bufferovan\u00e9 a ukladan\u00e9 do \u00falo\u017eiska postupne. Na udr\u017eanie stavu cache medzi re\u0161tartami m\u00f4\u017ee by\u0165 pou\u017eit\u00e1 nov\u00e1 funkcia, ktor\u00e1 sa objavila v verzii 1.5.18, na ukladanie v\u00fdpisu s cache do s\u00faboru. Pri \u010fal\u0161om spusten\u00ed je mo\u017en\u00e9 obnovi\u0165 cache z tohto s\u00faboru, aby sa zabr\u00e1nilo \u0161pi\u010dk\u00e1m za\u0165a\u017eenia spracovate\u013eov obsahu kv\u00f4li vypr\u00e1zdneniu cache (cache sa okam\u017eite st\u00e1va «teplou»).<\/p>\n

Druh\u00e9 d\u00f4le\u017eit\u00e9 zmeny v Memcached 1.6 spo\u010d\u00edva v prepracovan\u00ed k\u00f3du pre sie\u0165ov\u00fa interakciu, ktor\u00fd je prisp\u00f4soben\u00fd na automatick\u00e9 spracovanie d\u00e1vkov\u00fdch po\u017eiadaviek v r\u00e1mci jedn\u00e9ho syst\u00e9mov\u00e9ho volania. Predt\u00fdm, pri prenose viacer\u00fdch pr\u00edkazov 'GET' v jednom TCP pakete, memcached posielal v\u00fdsledky s vykon\u00e1van\u00edm samostatn\u00fdch syst\u00e9mov\u00fdch volan\u00ed. V Memcached 1.6 sa odpovede agreguj\u00fa a vracaj\u00fa prostredn\u00edctvom odoslania jedn\u00e9ho syst\u00e9mov\u00e9ho volania. Ako v\u00fdsledok, v priemere sa teraz z\u00edska 1,5 k\u013e\u00fa\u010da na syst\u00e9mov\u00e9 volanie, \u010do v testoch demon\u0161truje zn\u00ed\u017eenie z\u00e1\u0165a\u017ee CPU o 25 % a skr\u00e1tenie oneskoren\u00ed o nieko\u013eko percent.<\/p>\n

Prepracovanie sie\u0165ovej subsyst\u00e9movej architekt\u00fary tie\u017e umo\u017enilo prejs\u0165 na dynamick\u00e9 pride\u013eovanie bufferov pod\u013ea potreby, namiesto statick\u00e9ho priradenia bufferov. T\u00e1to optimaliz\u00e1cia zn\u00ed\u017eila spotrebu pam\u00e4te v re\u017eime \u010dakania na nov\u00e9 pr\u00edkazy cez stanoven\u00e9 klientom pripojenie z 4,5 KB na 400-500 bajtov a tie\u017e umo\u017enila zbavi\u0165 sa mnoh\u00fdch volan\u00ed malloc, realloc a free, ktor\u00e9 sp\u00f4sobuj\u00fa zbyto\u010dn\u00fa fragment\u00e1ciu pam\u00e4te na syst\u00e9moch s ve\u013ek\u00fdm po\u010dtom pripojen\u00ed. Ka\u017ed\u00fd pracovn\u00fd vl\u00e1kno teraz spracov\u00e1va svoj vlastn\u00fd baz\u00e9n bufferov na \u010d\u00edtanie a z\u00e1pis pre akt\u00edvne klientsk\u00e9 pripojenia. Na nastavenie ve\u013ekosti t\u00fdchto bufferov
\ns\u00fa k dispoz\u00edcii mo\u017enosti '-o resp_obj_mem_limit=N' a '-o read_buf_mem_limt=N'.<\/p>\n

V verzii 1.6 bolo taktie\u017e ozn\u00e1men\u00e9, \u017ee sa prech\u00e1dza do kateg\u00f3rie zastaran\u00e9ho bin\u00e1rneho protokolu<\/a><\/noindex> komunik\u00e1cie so serverom. \u00dadr\u017eba bin\u00e1rneho protokolu a odstra\u0148ovanie ch\u00fdb bud\u00fa pokra\u010dova\u0165, ale nov\u00e9 funkcie a aktualiz\u00e1cie existuj\u00facich funkci\u00ed sa nebud\u00fa pren\u00e1\u0161a\u0165. Textov\u00fd protokol<\/a><\/noindex> pokra\u010duje vo v\u00fdvoji bez zmien. Namiesto bin\u00e1rneho protokolu pri\u0161iel nov\u00fd protokol meta<\/a><\/noindex> (textov\u00e1 verzia protokolu s kompaktn\u00fdmi meta-pr\u00edkazmi), ktor\u00e1 ukazuje optim\u00e1lnu kombin\u00e1ciu v\u00fdkonu a spo\u013eahlivosti. Nov\u00fd protokol pokr\u00fdva v\u0161etky oper\u00e1cie, ktor\u00e9 boli predt\u00fdm dostupn\u00e9 prostredn\u00edctvom textov\u00e9ho a bin\u00e1rneho protokolu.<\/p>\n

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

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

\u0421\u043e\u0441\u0442\u043e\u044f\u043b\u0441\u044f \u0437\u043d\u0430\u0447\u0438\u0442\u0435\u043b\u044c\u043d\u044b\u0439 \u0440\u0435\u043b\u0438\u0437 \u0441\u0438\u0441\u0442\u0435\u043c\u044b \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0434\u0430\u043d\u043d\u044b\u0445 \u0432 \u043e\u043f\u0435\u0440\u0430\u0442\u0438\u0432\u043d\u043e\u0439 \u043f\u0430\u043c\u044f\u0442\u0438 Memcached 1.6.0, \u043e\u043f\u0435\u0440\u0438\u0440\u0443\u044e\u0449\u0435\u0439 \u0434\u0430\u043d\u043d\u044b\u043c\u0438 \u0432 \u0444\u043e\u0440\u043c\u0430\u0442\u0435 \u043a\u043b\u044e\u0447\/\u0437\u043d\u0430\u0447\u0435\u043d\u0438\u0435 \u0438 \u043e\u0442\u043b\u0438\u0447\u0430\u044e\u0449\u0435\u0439\u0441\u044f \u043f\u0440\u043e\u0441\u0442\u043e\u0442\u043e\u0439 \u0438\u0441\u043f\u043e\u043b\u044c\u0437\u043e\u0432\u0430\u043d\u0438\u044f. Memcached \u043e\u0431\u044b\u0447\u043d\u043e \u043f\u0440\u0438\u043c\u0435\u043d\u044f\u0435\u0442\u0441\u044f \u043a\u0430\u043a \u043b\u0435\u0433\u043a\u043e\u0432\u0435\u0441\u043d\u043e\u0435 \u0440\u0435\u0448\u0435\u043d\u0438\u0435 \u0434\u043b\u044f \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u0440\u0430\u0431\u043e\u0442\u044b \u0432\u044b\u0441\u043e\u043a\u043e\u043d\u0430\u0433\u0440\u0443\u0436\u0435\u043d\u043d\u044b\u0445 \u0441\u0430\u0439\u0442\u043e\u0432 \u043f\u0443\u0442\u0451\u043c \u043a\u044d\u0448\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u0435 \u0434\u043e\u0441\u0442\u0443\u043f\u0430 \u043a \u0421\u0423\u0411\u0414 \u0438 \u043f\u0440\u043e\u043c\u0435\u0436\u0443\u0442\u043e\u0447\u043d\u044b\u043c \u0434\u0430\u043d\u043d\u044b\u043c. \u041a\u043e\u0434 \u043f\u043e\u0441\u0442\u0430\u0432\u043b\u044f\u0435\u0442\u0441\u044f \u043f\u043e\u0434 \u043b\u0438\u0446\u0435\u043d\u0437\u0438\u0435\u0439 BSD. \u0412 \u043d\u043e\u0432\u043e\u0439 \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\udd47Vydanie Memcached 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