{"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\/pt\/blog\/news\/memcached-1-6-0-sistema-keshirovaniya-dannyh-v-ozu-s-vozmozhnostyu-sohraneniya-na-vneshnem-nositele","title":{"rendered":"Memcached 1.6.0 \u2014 sistema de cache de dados em RAM com possibilidade de armazenamento em dispositivos externos","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"


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

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

No dia 8 de mar\u00e7o, ocorreu a atualiza\u00e7\u00e3o do sistema de cache de dados na mem\u00f3ria operacional Memcached<\/strong> at\u00e9 a vers\u00e3o 1.6.0<\/strong>. A principal diferen\u00e7a em rela\u00e7\u00e3o \u00e0s vers\u00f5es anteriores \u00e9 que agora \u00e9 poss\u00edvel usar um dispositivo externo para o armazenamento de dados em cache.<\/p>\n

Memcached<\/strong> \u00e9 utilizado para acelerar o funcionamento de sites ou aplica\u00e7\u00f5es web de alta carga, atrav\u00e9s do cache de acesso a SGBDs e dados intermedi\u00e1rios.<\/p>\n

Na nova vers\u00e3o, durante a compila\u00e7\u00e3o, o par\u00e2metro extstore<\/strong>, que \u00e9 respons\u00e1vel pelo uso de dispositivos externos. Para desativar a fun\u00e7\u00e3o, deve-se especificar no .\\\/configure o par\u00e2metro \u2014disable-extstore. No entanto, apesar de a constru\u00e7\u00e3o estar habilitada por padr\u00e3o, ao iniciar, a utiliza\u00e7\u00e3o dessa fun\u00e7\u00e3o deve ser indicada explicitamente.<\/p>\n

Extstore<\/strong> permite o uso de dispositivos externos Flash<\/strong> ou SSD<\/strong> para aumentar o tamanho do cache. Isso permitir\u00e1 cachear volumes de dados muito maiores do que sem essa funcionalidade.<\/p>\n

Outra importante novidade foi a reformula\u00e7\u00e3o da intera\u00e7\u00e3o de rede, que agora est\u00e1 adaptada para o processamento autom\u00e1tico de chamadas em lote em um \u00fanico chamado de sistema. Nas vers\u00f5es anteriores, o processamento de cada requisi\u00e7\u00e3o GET era transmitido em pacotes separados, enquanto na nova vers\u00e3o as respostas a v\u00e1rias requisi\u00e7\u00f5es s\u00e3o agrupadas em um metapacote e enviadas de uma s\u00f3 vez. Como resultado dessa inova\u00e7\u00e3o, a carga na CPU foi reduzida em 25%.<\/p>\n

Al\u00e9m disso, como resultado dessa moderniza\u00e7\u00e3o, o consumo de mem\u00f3ria para buffer diminuiu \u2014 de 4,5 KB para 400-500 bytes por chamada, e o uso das fun\u00e7\u00f5es malloc, realloc e free foi reduzido, o que resultou em menor fragmenta\u00e7\u00e3o de mem\u00f3ria. Cada thread agora gerencia seu pr\u00f3prio pool de buffers para leitura e escrita para conex\u00f5es ativas. Para configurar o tamanho desses buffers, est\u00e3o dispon\u00edveis as op\u00e7\u00f5es -o resp_obj_mem_limit=N e -o read_buf_mem_limt=N.<\/p>\n

Foi tamb\u00e9m anunciada a transi\u00e7\u00e3o do protocolo bin\u00e1rio de troca com o servidor para a categoria de 'obsoleto'. Ele foi substitu\u00eddo pelo protocolo meta \u2014 uma vers\u00e3o textual do protocolo com comandos meta compactos. No novo protocolo, todas as opera\u00e7\u00f5es previamente dispon\u00edveis que utilizavam as vers\u00f5es antigas do protocolo bin\u00e1rio foram consideradas.<\/p>\n

<\/p>\n

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

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

>>> C\u00f3digo fonte<\/a> (licen\u00e7a BSD)<\/p>\n

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

>>> Descri\u00e7\u00e3o do Extstore<\/a><\/p>\n

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

>>> Descri\u00e7\u00e3o dos comandos meta<\/a><\/p>\n

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

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

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