{"id":73789,"date":"2020-03-12T08:42:49","date_gmt":"2020-03-12T05:42:49","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/memcached-1-6-0-sistema-keshirovaniya-dannyh-v-ozu-s-vozmozhnostyu-sohraneniya-na-vneshnem-nositele"},"modified":"2020-03-12T08:42:49","modified_gmt":"2020-03-12T05:42:49","slug":"memcached-1-6-0-sistema-keshirovaniya-dannyh-v-ozu-s-vozmozhnostyu-sohraneniya-na-vneshnem-nositele","status":"publish","type":"post","link":"https:\/\/prohoster.info\/fr\/blog\/news\/memcached-1-6-0-sistema-keshirovaniya-dannyh-v-ozu-s-vozmozhnostyu-sohraneniya-na-vneshnem-nositele","title":{"rendered":"Memcached 1.6.0 \u2014 un syst\u00e8me de mise en cache de donn\u00e9es en RAM avec la possibilit\u00e9 de sauvegarde sur un support externe.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"


\n \"Memcached<\/p>\n

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

Le 8 mars, une mise \u00e0 jour du syst\u00e8me de mise en cache des donn\u00e9es en m\u00e9moire vive a \u00e9t\u00e9 effectu\u00e9e. Memcached<\/strong> vers la version 1.6.0<\/strong>. La principale diff\u00e9rence par rapport aux versions pr\u00e9c\u00e9dentes est que d\u00e9sormais, il est possible d'utiliser un dispositif externe pour le stockage des donn\u00e9es mises en cache.<\/p>\n

Memcached<\/strong> est utilis\u00e9e pour acc\u00e9l\u00e9rer le fonctionnement de sites ou d'applications web \u00e0 forte charge en mettant en cache l'acc\u00e8s aux bases de donn\u00e9es et aux donn\u00e9es interm\u00e9diaires.<\/p>\n

Dans la nouvelle version, le param\u00e8tre extstore<\/strong>, qui est responsable de l'utilisation du support externe. Pour d\u00e9sactiver cette fonctionnalit\u00e9, il faut sp\u00e9cifier le param\u00e8tre \u2014disable-extstore dans .\\\/configure. Cependant, malgr\u00e9 une configuration activ\u00e9e par d\u00e9faut, il est n\u00e9cessaire d'indiquer explicitement l'utilisation de cette fonctionnalit\u00e9 au d\u00e9marrage.<\/p>\n

Extstore<\/strong> permet d'utiliser des Flash<\/strong> ou SSD<\/strong> supports externes pour augmenter la taille du cache. Cela permettra de mettre en cache des volumes de donn\u00e9es beaucoup plus importants qu'en l'absence de cette fonctionnalit\u00e9.<\/p>\n

Une autre nouveaut\u00e9 importante est la refonte de l'interaction r\u00e9seau, d\u00e9sormais adapt\u00e9e pour le traitement automatique des appels group\u00e9s dans le cadre d'un seul appel syst\u00e8me. Dans les versions pr\u00e9c\u00e9dentes, le traitement de chaque requ\u00eate GET \u00e9tait effectu\u00e9 dans un paquet distinct, tandis que dans la nouvelle version, les r\u00e9ponses \u00e0 plusieurs requ\u00eates sont regroup\u00e9es en un m\u00e9tapaquet et envoy\u00e9es en une seule fois. Cette innovation a permis de r\u00e9duire la charge CPU de 25%.<\/p>\n

De plus, cette modernisation a permis de r\u00e9duire la consommation de m\u00e9moire pour la mise en tampon \u2014 de 4,5 Ko \u00e0 400-500 octets par appel, et a diminu\u00e9 l'utilisation des fonctions malloc, realloc et free, ce qui a entra\u00een\u00e9 une fragmentation de m\u00e9moire moindre. Chaque thread g\u00e8re d\u00e9sormais son propre pool de buffers pour la lecture et l'\u00e9criture des connexions actives. Des options -o resp_obj_mem_limit=N et -o read_buf_mem_limit=N sont disponibles pour configurer la taille de ces buffers.<\/p>\n

Il a \u00e9galement \u00e9t\u00e9 annonc\u00e9 que le protocole binaire d'\u00e9change avec le serveur passait au statut de \u00ab obsol\u00e8te \u00bb. Il a \u00e9t\u00e9 remplac\u00e9 par le protocole meta \u2014 une version textuelle du protocole avec des m\u00e9ta-commandes compactes. Le nouveau protocole prend en compte toutes les op\u00e9rations disponibles auparavant qui utilisaient les anciennes versions du protocole binaire.<\/p>\n

<\/p>\n

>>> Site officiel<\/a><\/p>\n

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

>>> Code source<\/a> (licence BSD)<\/p>\n

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

>>> Description d'Extstore<\/a><\/p>\n

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

>>> Description des m\u00e9ta-commandes<\/a><\/p>\n

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

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

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