{"id":79056,"date":"2020-04-24T01:42:07","date_gmt":"2020-04-23T23:42:07","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux"},"modified":"2020-04-24T01:42:07","modified_gmt":"2020-04-23T23:42:07","slug":"facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","title":{"rendered":"Facebook ha proposto un nuovo meccanismo di gestione della memoria slab per il kernel Linux","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Roman Gushchin (Roman Gushchin<\/a><\/noindex>) di Facebook ha pubblicato<\/a><\/noindex> ha presentato alla mailing list degli sviluppatori del kernel Linux un insieme di patch per l'implementazione di un nuovo controller di distribuzione della memoria slab<\/a><\/noindex> (controller di memoria slab). Questo nuovo controller \u00e8 notevole per il trasferimento del tracciamento delle slab dal livello delle pagine di memoria al livello degli oggetti del kernel, consentendo di riutilizzare le pagine slab tra diversi cgroup, invece di riservare cache slab separate per ogni cgroup. <\/p>\n

L'approccio proposto permette di migliorare l'efficienza dell'uso delle slab, ridurre la dimensione della memoria utilizzata per le slab del 30-45% e diminuire significativamente il consumo complessivo di memoria da parte del kernel. La riduzione del numero di slab non spostabili porta a un effetto positivo nella riduzione della frammentazione della memoria. Il nuovo controller di memoria semplifica notevolmente il codice per il tracciamento delle slab e non richiede l'uso di algoritmi complessi per la creazione e l'eliminazione dinamica delle cache slab per ogni cgroup. Tutti i cgroup di memoria nella nuova implementazione utilizzano un set condiviso di cache slab, e la durata della vita delle cache slab non \u00e8 pi\u00f9 vincolata alla durata della vita stabilita tramite cgroup limitazioni<\/a><\/noindex> per l'uso della memoria.<\/p>\n

Il nuovo controller slab, che offre una gestione pi\u00f9 precisa delle risorse, dovrebbe teoricamente caricare di pi\u00f9 la CPU, ma in pratica le differenze si sono rivelate trascurabili. In particolare, il nuovo controller slab \u00e8 stato utilizzato per diversi mesi sui server di produzione di Facebook, che gestiscono vari tipi di carico, e finora non sono stati riscontrati regressi significativi. Tuttavia, si \u00e8 osservata una significativa riduzione del consumo di memoria \u2014 in alcuni host si \u00e8 riusciti a risparmiare fino a 1 GB di RAM, ma questo valore dipende fortemente dal tipo di carico, dalla dimensione totale della RAM, dal numero di CPU e dalle specifiche modalit\u00e0 di gestione della memoria. Test precedenti hanno mostrato<\/a><\/noindex> mostravano una riduzione del consumo di memoria di 650-700 MB (42% della memoria slab) sul front-end web, 750-800 MB (35%) su un server con cache DBMS e 700 MB (36%) su un server DNS.<\/p>\n

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

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

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Questo nuovo controller \u00e8 notevole per il trasferimento del tracciamento delle slab dal livello delle pagine di memoria al livello degli oggetti del kernel, consentendo di riutilizzare le pagine slab tra diversi cgroup, invece di riservare cache slab separate per","canonical_url":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/facebook-predlozhil-novyj-mehanizm-upravleniya-pamyatyu-slab-dlya-yadra-linux","robots":"max-image-preview:large","keywords":"","webmasterTools":{"miscellaneous":""},"schema":null,"og:locale":"it_IT","og:site_name":"ProHoster | \u041a\u0443\u043f\u0438\u0442\u044c \u043d\u0430\u0434\u0435\u0436\u043d\u044b\u0439 \u0445\u043e\u0441\u0442\u0438\u043d\u0433 \u0434\u043b\u044f \u0441\u0430\u0439\u0442\u043e\u0432 \u0441 \u0437\u0430\u0449\u0438\u0442\u043e\u0439 \u043e\u0442 DDoS, VPS VDS \u0441\u0435\u0440\u0432\u0435\u0440\u044b","og:type":"article","og:title":"\ud83e\udd47Facebook \u043f\u0440\u0435\u0434\u043b\u043e\u0436\u0438\u043b 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