{"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\/ro\/blog\/news\/reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha","title":{"rendered":"Lansarea Memcached 1.6.0 cu suport pentru stocare extern\u0103","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

A avut loc<\/a><\/noindex> o lansare semnificativ\u0103 a sistemului de caching \u00een memorie Memcached 1.6.0<\/a><\/noindex>, care gestioneaz\u0103 datele \u00een format cheie\/valoare \u0219i se distinge prin u\u0219urin\u021ba de utilizare. Memcached este folosit de obicei ca o solu\u021bie u\u0219oar\u0103 pentru accelerarea func\u021bion\u0103rii site-urilor cu un trafic ridicat prin cache-ul accesului la DBMS \u0219i la datele intermediare. Cod este livrat<\/a><\/noindex> sub licen\u021ba BSD.<\/p>\n

\u00cen noua versiune, a fost stabilizat\u0103 implementarea stoc\u0103rii \u201eextstore<\/a><\/noindex>\u201d, care acum este compilat\u0103 implicit (op\u021biunea \u201e--disable-extstore\u201d este disponibil\u0103 \u00een scriptul configure pentru a o dezactiva), dar necesit\u0103 activare explicit\u0103 la pornire (instal\u0103rile vechi vor continua s\u0103 func\u021bioneze f\u0103r\u0103 modific\u0103ri dup\u0103 actualizare). De\u0219i stocarea \u201eextstore\u201d a fost recunoscut\u0103 ca fiind stabil\u0103, se recomand\u0103 precau\u021bie la implementarea acesteia \u00een sisteme foarte mari.<\/p>\n

Extstore permite utilizarea unit\u0103\u021bilor SSD\/Flash pentru a extinde dimensiunea cache-ului. La fel ca \u00een cazul folosirii memoriei RAM, stocarea pe Flash nu este permanent\u0103 \u0219i se reseteaz\u0103 la repornire. Unul dintre domeniile de aplicare ale noului mod este asigurarea unei cache-iz\u0103ri eficiente a datelor de mari dimensiuni. C\u00e2nd se folose\u0219te \u201eextstore\u201d, cheile \u0219i metadatele r\u0103m\u00e2n, ca \u0219i \u00eenainte, doar \u00een memorie, \u00eens\u0103 datele mari asociate cu cheile, care dep\u0103\u0219esc pragul stabilit, sunt stocate \u00een stocarea extern\u0103, iar \u00een RAM r\u0103m\u00e2ne doar un pointer. <\/p>\n

Dac\u0103 datele asociate cu o cheie sunt mici, atunci Memcached func\u021bioneaz\u0103 ca de obicei, p\u0103str\u00e2nd datele \u00een memorie \u0219i f\u0103r\u0103 a accesa stocarea extern\u0103. Dac\u0103 exist\u0103 mult\u0103 memorie liber\u0103, cele mai solicitate date pot r\u0103m\u00e2ne integral \u00een cache \u00een memorie (de exemplu, se poate specifica ca pe Flash s\u0103 fie resetate doar obiectele mai mari de 1024 bytes, la care nu s-a accesat timp de 3600 de secunde\u201d).<\/p>\n

Implementarea este optimizat\u0103 pentru a oferi performan\u021b\u0103 maxim\u0103 \u0219i o povar\u0103 minim\u0103 asupra CPU, \u00een detrimentul eficien\u021bei stoc\u0103rii (un grad mare de fragmentare). Pentru a prelungi durata de via\u021b\u0103 a unit\u0103\u021bilor Flash, datele sunt tamponate \u0219i resetate \u00een stocare \u00een mod secven\u021bial. Pentru a p\u0103stra starea cache-ului \u00eentre reporniri, poate fi utilizat\u0103 func\u021bionalitatea care a ap\u0103rut \u00een versiunea 1.5.18, care permite salvarea unui dump al cache-ului \u00eentr-un fi\u0219ier. La urm\u0103toarea pornire, cache-ul poate fi restaurat din acest fi\u0219ier pentru a evita v\u00e2rfurile de sarcin\u0103 asupra handler-elor de con\u021binut din cauza insuficien\u021bei cache-ului (cache-ul devine imediat \u201ecald\u201d).<\/p>\n

A doua modificare important\u0103 \u00een Memcached 1.6 a fost revizuirea codului pentru interac\u021biunea de re\u021bea, care a fost adaptat\u0103 pentru a gestiona automat cererile de tip lot \u00een cadrul unei singure apeluri de sistem. Precedent, atunci c\u00e2nd mai multe comenzi «GET» erau transmise \u00eentr-un singur pachet TCP, memcached trimitea rezultatele prin executarea unor apeluri de sistem separate. \u00cen Memcached 1.6, r\u0103spunsurile sunt agregate \u0219i returnate prin trimiterea unui singur apel de sistem. Ca rezultat, acum avem, \u00een medie, 1.5 chei pe apel de sistem, ceea ce demonstreaz\u0103, \u00een teste, o reducere a sarcinii CPU cu p\u00e2n\u0103 la 25% \u0219i o diminuare a \u00eent\u00e2rzierilor cu c\u00e2teva procente.<\/p>\n

Refacerea subsistemului re\u021belei a permis, de asemenea, trecerea la alocarea dinamic\u0103 a bufferelor dup\u0103 necesitate, \u00een loc de alocarea static\u0103 a acestora. Aceast\u0103 optimizare a redus consumul de memorie \u00een a\u0219teptarea unor comenzi noi printr-o conexiune stabilit\u0103 de client de la 4.5 Kb la 400-500 de bi\u021bi, precum \u0219i a \u00eenl\u0103turat multe apeluri malloc, realloc \u0219i free, care conduceau la o fragmentare suplimentar\u0103 a memoriei pe sistemele cu un num\u0103r mare de conexiuni. Fiecare thread de lucru proceseaz\u0103 acum propriul s\u0103u pool de buffere pentru citire \u0219i scriere pentru conexiunile client active. Pentru a configura dimensiunea acestor buffere
\nsunt prev\u0103zute op\u021biunile «-o resp_obj_mem_limit=N» \u0219i «-o read_buf_mem_limit=N».<\/p>\n

\u00cen rama 1.6, de asemenea, s-a anun\u021bat trecerea \u00een categoria \u00eenvechit\u0103 a protocolului binar<\/a><\/noindex> de interac\u021biune cu serverul. \u00centre\u021binerea protocolului binar \u0219i corectarea erorilor vor continua, dar noile func\u021bionalit\u0103\u021bi \u0219i actualiz\u0103rile func\u021biilor existente nu vor fi transferate. Protocolul text<\/a><\/noindex> va continua s\u0103 se dezvolte f\u0103r\u0103 modific\u0103ri. \u00cen locul protocolului binar a venit un nou protocol meta<\/a><\/noindex> (varianta text a protocolului cu comenzi meta compacte), care demonstreaz\u0103 un echilibru optim \u00eentre performan\u021b\u0103 \u0219i fiabilitate. Noul protocol acoper\u0103 toate opera\u021biunile, anterior disponibile prin intermediul protocolului text \u0219i binar.<\/p>\n

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

Sursa: opennet.ro<\/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\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\udd47Lansarea Memcached 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