{"id":55519,"date":"2020-01-22T00:00:00","date_gmt":"2020-01-21T21:00:00","guid":{"rendered":"https:\/\/prohoster.info\/blog\/blog_prohoster\/dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard"},"modified":"2020-02-18T14:03:38","modified_gmt":"2020-02-18T11:03:38","slug":"dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard","status":"publish","type":"post","link":"https:\/\/prohoster.info\/ro\/blog\/news\/dlya-btrfs-predstavlena-asinhronnaya-realizatsiya-discard","title":{"rendered":"Pentru Btrfs este prezentat\u0103 o implementare asincron\u0103 a DISCARD","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Pentru sistemul de fi\u0219iere btrfs a fost prezentat\u0103<\/a><\/noindex> implementarea asincron\u0103 a opera\u021biei DISCARD (marcarea blocurilor eliberate care nu mai pot fi stocate fizic), realizat\u0103 de inginerii companiei Facebook.<\/p>\n

Problema const\u0103 \u00een faptul c\u0103 \u00een implementarea ini\u021bial\u0103, DISCARD se execut\u0103 sincron cu celelalte opera\u021bii, ceea ce, \u00een anumite cazuri, duce la probleme de performan\u021b\u0103, deoarece trebuie s\u0103 a\u0219tepte finalizarea comenzilor corespunz\u0103toare ale unit\u0103\u021bii de stocare, ceea ce necesit\u0103 timp suplimentar. Acest lucru poate deveni o problem\u0103 dac\u0103 implementarea DISCARD a unit\u0103\u021bii de stocare func\u021bioneaz\u0103 lent. <\/p>\n

\u00cen cazul unei implement\u0103ri asincrone, nu este necesar s\u0103 se a\u0219tepte finalizarea DISCARD de c\u0103tre unitatea de stocare \u00een timpul func\u021bion\u0103rii normale a FS, ceea ce elimin\u0103 problema, transform\u00e2nd aceast\u0103 opera\u021bie \u00een una de fundal. Implementarea prezentat\u0103 efectueaz\u0103, de asemenea, unele optimiz\u0103ri. De exemplu, a\u0219teapt\u0103 o anumit\u0103 perioad\u0103 de timp, lu\u00e2nd \u00een considerare c\u0103 blocul va fi utilizat \u00een cur\u00e2nd, astfel \u00eenc\u00e2t s\u0103 nu aib\u0103 sens s\u0103 se efectueze procedura DISCARD, \u0219i \u00eencearc\u0103 s\u0103 combine regiunile \u00eenainte de a efectua efectiv DISCARD pentru a reduce num\u0103rul total de opera\u021bii.<\/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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