{"id":476157,"date":"2023-08-09T07:26:52","date_gmt":"2023-08-09T07:26:52","guid":{"rendered":""},"modified":"2023-09-05T11:12:09","modified_gmt":"2023-09-05T11:12:09","slug":"cache-miss","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/cache-miss\/","title":{"rendered":"Thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m"},"content":{"rendered":"

L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m l\u00e0 m\u1ed9t kh\u00e1i ni\u1ec7m quan tr\u1ecdng trong khoa h\u1ecdc m\u00e1y t\u00ednh v\u00e0 \u0111\u00f3ng vai tr\u00f2 quan tr\u1ecdng trong vi\u1ec7c c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t c\u1ee7a c\u00e1c h\u1ec7 th\u1ed1ng kh\u00e1c nhau, bao g\u1ed3m c\u1ea3 m\u00e1y ch\u1ee7 proxy. N\u00f3 \u0111\u1ec1 c\u1eadp \u0111\u1ebfn t\u00ecnh hu\u1ed1ng trong \u0111\u00f3 d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u kh\u00f4ng \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong b\u1ed9 nh\u1edb \u0111\u1ec7m v\u00e0 c\u1ea7n \u0111\u01b0\u1ee3c t\u00ecm n\u1ea1p t\u1eeb b\u1ed9 nh\u1edb ch\u00ednh ho\u1eb7c b\u1ed9 l\u01b0u tr\u1eef, g\u00e2y ra \u0111\u1ed9 tr\u1ec5 b\u1ed5 sung. L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 th\u1ec3 t\u00e1c \u0111\u1ed9ng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn hi\u1ec7u su\u1ea5t v\u00e0 t\u1ed1c \u0111\u1ed9 t\u1ed5ng th\u1ec3 c\u1ee7a qu\u00e1 tr\u00ecnh truy xu\u1ea5t d\u1eef li\u1ec7u, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t kh\u00eda c\u1ea1nh thi\u1ebft y\u1ebfu c\u1ee7a vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a h\u1ec7 th\u1ed1ng.<\/p>\n

L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a Cache miss v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean nh\u1eafc t\u1edbi n\u00f3<\/h2>\n

Kh\u00e1i ni\u1ec7m v\u1ec1 b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 t\u1eeb nh\u1eefng n\u0103m 1960 khi c\u00e1c h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh \u0111\u1eddi \u0111\u1ea7u b\u1eaft \u0111\u1ea7u c\u00f3 kho\u1ea3ng c\u00e1ch hi\u1ec7u su\u1ea5t \u0111\u00e1ng k\u1ec3 gi\u1eefa b\u1ed9 x\u1eed l\u00fd v\u00e0 b\u1ed9 nh\u1edb. \u0110\u1ec3 thu h\u1eb9p kho\u1ea3ng c\u00e1ch n\u00e0y, b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u01b0\u1ee3c gi\u1edbi thi\u1ec7u nh\u01b0 m\u1ed9t th\u00e0nh ph\u1ea7n b\u1ed9 nh\u1edb nh\u1ecf h\u01a1n v\u00e0 nhanh h\u01a1n \u0111\u1ec3 l\u01b0u tr\u1eef d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean. Thu\u1eadt ng\u1eef \u201ccache miss\u201d xu\u1ea5t hi\u1ec7n v\u00e0o \u0111\u1ea7u nh\u1eefng n\u0103m 1970 c\u00f9ng v\u1edbi s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a h\u1ec7 th\u1ed1ng b\u1ed9 nh\u1edb d\u1ef1a tr\u00ean b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n

Th\u00f4ng tin chi ti\u1ebft v\u1ec1 Cache miss. M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 Cache miss.<\/h2>\n

Khi x\u1ea3y ra l\u1ed7i b\u1ed9 \u0111\u1ec7m, CPU ho\u1eb7c b\u1ed9 x\u1eed l\u00fd c\u1ee7a h\u1ec7 th\u1ed1ng kh\u00f4ng th\u1ec3 t\u00ecm th\u1ea5y d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u trong b\u1ed9 nh\u1edb \u0111\u1ec7m c\u1ee7a n\u00f3. Do \u0111\u00f3, n\u00f3 ph\u1ea3i t\u00ecm n\u1ea1p d\u1eef li\u1ec7u t\u1eeb b\u1ed9 nh\u1edb ch\u00ednh ho\u1eb7c b\u1ed9 nh\u1edb ngo\u00e0i, d\u1eabn \u0111\u1ebfn th\u1eddi gian truy c\u1eadp v\u00e0 \u0111\u1ed9 tr\u1ec5 t\u0103ng l\u00ean. L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 th\u1ec3 x\u1ea3y ra v\u00ec nhi\u1ec1u l\u00fd do, ch\u1eb3ng h\u1ea1n nh\u01b0:<\/p>\n

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  1. \n

    Thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m b\u1eaft bu\u1ed9c:<\/strong> \u0110i\u1ec1u n\u00e0y x\u1ea3y ra khi m\u1ed9t m\u1ee5c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0 kh\u00f4ng c\u00f3 trong b\u1ed9 \u0111\u1ec7m. V\u00ec b\u1ed9 nh\u1edb \u0111\u1ec7m tr\u1ed1ng khi b\u1eaft \u0111\u1ea7u n\u00ean l\u1ea7n truy c\u1eadp \u0111\u1ea7u ti\u00ean s\u1ebd lu\u00f4n d\u1eabn \u0111\u1ebfn l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<\/li>\n

  2. \n

    Dung l\u01b0\u1ee3ng b\u1ed9 nh\u1edb cache b\u1ecb thi\u1ebfu:<\/strong> Khi b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ea7y v\u00e0 c\u1ea7n thay th\u1ebf m\u1ee5c nh\u1eadp hi\u1ec7n c\u00f3 b\u1eb1ng m\u1ee5c nh\u1eadp m\u1edbi, l\u1ed7i dung l\u01b0\u1ee3ng b\u1ed9 nh\u1edb \u0111\u1ec7m s\u1ebd x\u1ea3y ra. D\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean c\u00f3 th\u1ec3 b\u1ecb x\u00f3a kh\u1ecfi b\u1ed9 \u0111\u1ec7m, d\u1eabn \u0111\u1ebfn nhi\u1ec1u l\u1ea7n b\u1ecf l\u1ee1 h\u01a1n.<\/p>\n<\/li>\n

  3. \n

    Thi\u1ebfu b\u1ed9 \u0111\u1ec7m xung \u0111\u1ed9t:<\/strong> C\u00f2n \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m do va ch\u1ea1m, \u0111i\u1ec1u n\u00e0y x\u1ea3y ra trong c\u00e1c b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u01b0\u1ee3c \u00e1nh x\u1ea1 tr\u1ef1c ti\u1ebfp ho\u1eb7c b\u1ed9 nh\u1edb \u0111\u1ec7m li\u00ean k\u1ebft t\u1eadp h\u1ee3p khi nhi\u1ec1u m\u1ee5c d\u1eef li\u1ec7u tranh gi\u00e0nh c\u00f9ng m\u1ed9t khe b\u1ed9 nh\u1edb \u0111\u1ec7m, d\u1eabn \u0111\u1ebfn xung \u0111\u1ed9t v\u00e0 x\u00f3a b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<\/li>\n

  4. \n

    Thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m k\u1ebft h\u1ee3p:<\/strong> Trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111a b\u1ed9 x\u1eed l\u00fd c\u00f3 b\u1ed9 nh\u1edb \u0111\u1ec7m d\u00f9ng chung, l\u1ed7i k\u1ebft h\u1ee3p x\u1ea3y ra khi b\u1ed9 x\u1eed l\u00fd c\u1ea7n t\u00ecm n\u1ea1p d\u1eef li\u1ec7u \u0111\u00e3 \u0111\u01b0\u1ee3c b\u1ed9 x\u1eed l\u00fd kh\u00e1c s\u1eeda \u0111\u1ed5i.<\/p>\n<\/li>\n<\/ol>\n

    L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 th\u1ec3 \u1ea3nh h\u01b0\u1edfng \u0111\u00e1ng k\u1ec3 \u0111\u1ebfn hi\u1ec7u su\u1ea5t c\u1ee7a nhi\u1ec1u \u1ee9ng d\u1ee5ng kh\u00e1c nhau, \u0111\u1eb7c bi\u1ec7t l\u00e0 trong c\u00e1c t\u00ecnh hu\u1ed1ng m\u00e0 th\u00f4ng l\u01b0\u1ee3ng d\u1eef li\u1ec7u cao v\u00e0 kh\u1ea3 n\u0103ng truy c\u1eadp c\u00f3 \u0111\u1ed9 tr\u1ec5 th\u1ea5p l\u00e0 r\u1ea5t quan tr\u1ecdng, ch\u1eb3ng h\u1ea1n nh\u01b0 trong m\u00e1y ch\u1ee7 web v\u00e0 m\u00e1y ch\u1ee7 proxy.<\/p>\n

    C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a Cache miss. C\u00e1ch ho\u1ea1t \u0111\u1ed9ng c\u1ee7a Cache miss.<\/h2>\n

    C\u01a1 ch\u1ebf b\u1ecf s\u00f3t b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 m\u1ed1i li\u00ean h\u1ec7 ch\u1eb7t ch\u1ebd v\u1edbi vi\u1ec7c t\u1ed5 ch\u1ee9c b\u1ed9 nh\u1edb \u0111\u1ec7m. B\u1ed9 nh\u1edb \u0111\u1ec7m th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng \u1edf nhi\u1ec1u c\u1ea5p \u0111\u1ed9, m\u1ed7i c\u1ea5p \u0111\u1ed9 c\u00f3 k\u00edch th\u01b0\u1edbc, t\u1ed1c \u0111\u1ed9 truy c\u1eadp v\u00e0 m\u1ee9c \u0111\u1ed9 g\u1ea7n b\u1ed9 x\u1eed l\u00fd kh\u00e1c nhau. Khi x\u1ea3y ra l\u1ed7i b\u1ed9 \u0111\u1ec7m, CPU s\u1ebd tu\u00e2n theo m\u1ed9t quy tr\u00ecnh c\u1ee5 th\u1ec3 \u0111\u1ec3 truy xu\u1ea5t d\u1eef li\u1ec7u c\u1ea7n thi\u1ebft:<\/p>\n

      \n
    1. \n

      Ph\u00e2n c\u1ea5p b\u1ed9 \u0111\u1ec7m:<\/strong> C\u00e1c h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh hi\u1ec7n \u0111\u1ea1i s\u1eed d\u1ee5ng h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p b\u1ed9 \u0111\u1ec7m nhi\u1ec1u c\u1ea5p, bao g\u1ed3m b\u1ed9 \u0111\u1ec7m L1, L2, L3 v\u00e0 \u0111\u00f4i khi c\u00f2n h\u01a1n th\u1ebf n\u1eefa. B\u1ed9 \u0111\u1ec7m L1 nh\u1ecf nh\u1ea5t nh\u01b0ng nhanh nh\u1ea5t, n\u1eb1m g\u1ea7n b\u1ed9 x\u1eed l\u00fd nh\u1ea5t, trong khi b\u1ed9 \u0111\u1ec7m L3 l\u1edbn h\u01a1n nh\u01b0ng ch\u1eadm h\u01a1n, n\u1eb1m xa h\u01a1n.<\/p>\n<\/li>\n

    2. \n

      T\u00ecm n\u1ea1p d\u00f2ng b\u1ed9 \u0111\u1ec7m:<\/strong> Khi x\u1ea3y ra l\u1ed7i b\u1ed9 \u0111\u1ec7m trong b\u1ed9 \u0111\u1ec7m L1, CPU s\u1ebd g\u1eedi y\u00eau c\u1ea7u \u0111\u1ebfn c\u1ea5p \u0111\u1ed9 b\u1ed9 \u0111\u1ec7m ho\u1eb7c b\u1ed9 nh\u1edb ch\u00ednh ti\u1ebfp theo \u0111\u1ec3 t\u00ecm n\u1ea1p kh\u1ed1i d\u1eef li\u1ec7u l\u1edbn h\u01a1n, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 d\u00f2ng b\u1ed9 \u0111\u1ec7m, bao g\u1ed3m m\u1ee5c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u.<\/p>\n<\/li>\n

    3. \n

      V\u1ecb tr\u00ed d\u00f2ng b\u1ed9 \u0111\u1ec7m:<\/strong> Sau \u0111\u00f3, d\u00f2ng b\u1ed9 \u0111\u1ec7m \u0111\u00e3 t\u00ecm n\u1ea1p s\u1ebd \u0111\u01b0\u1ee3c \u0111\u1eb7t v\u00e0o b\u1ed9 \u0111\u1ec7m, c\u00f3 kh\u1ea3 n\u0103ng thay th\u1ebf c\u00e1c d\u00f2ng b\u1ed9 \u0111\u1ec7m hi\u1ec7n c\u00f3 th\u00f4ng qua c\u00e1c thu\u1eadt to\u00e1n thay th\u1ebf kh\u00e1c nhau, ch\u1eb3ng h\u1ea1n nh\u01b0 LRU (\u00cdt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng g\u1ea7n \u0111\u00e2y nh\u1ea5t) ho\u1eb7c LFU (\u00cdt \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng th\u01b0\u1eddng xuy\u00ean nh\u1ea5t).<\/p>\n<\/li>\n

    4. \n

      T\u00e0i li\u1ec7u tham kh\u1ea3o trong t\u01b0\u01a1ng lai:<\/strong> Trong m\u1ed9t s\u1ed1 ki\u1ebfn tr\u00fac b\u1ed9 nh\u1edb \u0111\u1ec7m, c\u01a1 ch\u1ebf t\u00ecm n\u1ea1p tr\u01b0\u1edbc ph\u1ea7n c\u1ee9ng d\u1ef1 \u0111o\u00e1n v\u00e0 t\u00ecm n\u1ea1p d\u1eef li\u1ec7u c\u00f3 kh\u1ea3 n\u0103ng \u0111\u01b0\u1ee3c truy c\u1eadp trong t\u01b0\u01a1ng lai g\u1ea7n, gi\u00fap gi\u1ea3m t\u00e1c \u0111\u1ed9ng c\u1ee7a vi\u1ec7c thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<\/li>\n<\/ol>\n

      Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a Cache miss.<\/h2>\n

      L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh r\u1ea5t quan tr\u1ecdng \u0111\u1ec3 hi\u1ec3u \u0111\u01b0\u1ee3c t\u00e1c \u0111\u1ed9ng c\u1ee7a n\u00f3 \u0111\u1ed1i v\u1edbi hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng:<\/p>\n

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      1. \n

        T\u00e1c \u0111\u1ed9ng \u0111\u1ed9 tr\u1ec5:<\/strong> L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m g\u00e2y ra \u0111\u1ed9 tr\u1ec5 b\u1ed5 sung cho vi\u1ec7c truy c\u1eadp b\u1ed9 nh\u1edb, \u0111i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 g\u00e2y b\u1ea5t l\u1ee3i cho c\u00e1c \u1ee9ng d\u1ee5ng v\u00e0 h\u1ec7 th\u1ed1ng th\u1eddi gian th\u1ef1c c\u00f3 y\u00eau c\u1ea7u nghi\u00eam ng\u1eb7t v\u1ec1 hi\u1ec7u su\u1ea5t.<\/p>\n<\/li>\n

      2. \n

        \u0110\u00e1nh \u0111\u1ed5i hi\u1ec7u su\u1ea5t:<\/strong> K\u00edch th\u01b0\u1edbc b\u1ed9 \u0111\u1ec7m, t\u1ed5 ch\u1ee9c v\u00e0 c\u00e1c ch\u00ednh s\u00e1ch thay th\u1ebf \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn s\u1ef1 c\u00e2n b\u1eb1ng gi\u1eefa t\u1ef7 l\u1ec7 tr\u00fang \u0111\u00edch v\u00e0 t\u1ef7 l\u1ec7 b\u1ecf l\u1ee1 c\u00e1c qu\u1ea3 ph\u1ea1t \u0111\u1ec1n. Vi\u1ec7c t\u0103ng k\u00edch th\u01b0\u1edbc b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 th\u1ec3 gi\u1ea3m t\u1ef7 l\u1ec7 b\u1ecf l\u1ee1 nh\u01b0ng c\u0169ng l\u00e0m t\u0103ng \u0111\u1ed9 tr\u1ec5 truy c\u1eadp.<\/p>\n<\/li>\n

      3. \n

        V\u1ecb tr\u00ed kh\u00f4ng gian v\u00e0 th\u1eddi gian:<\/strong> L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m b\u1ecb \u1ea3nh h\u01b0\u1edfng b\u1edfi c\u00e1c nguy\u00ean t\u1eafc v\u1ec1 v\u1ecb tr\u00ed kh\u00f4ng gian v\u00e0 th\u1eddi gian. V\u1ecb tr\u00ed kh\u00f4ng gian \u0111\u1ec1 c\u1eadp \u0111\u1ebfn vi\u1ec7c truy c\u1eadp c\u00e1c m\u1ee5c d\u1eef li\u1ec7u g\u1ea7n v\u1edbi nh\u1eefng m\u1ee5c \u0111\u01b0\u1ee3c truy c\u1eadp g\u1ea7n \u0111\u00e2y, trong khi v\u1ecb tr\u00ed t\u1ea1m th\u1eddi c\u00f3 ngh\u0129a l\u00e0 truy c\u1eadp l\u1ea1i c\u00f9ng m\u1ed9t m\u1ee5c d\u1eef li\u1ec7u trong t\u01b0\u01a1ng lai g\u1ea7n.<\/p>\n<\/li>\n

      4. \n

        \u0110\u1ed9 nh\u1ea1y kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c:<\/strong> T\u00e1c \u0111\u1ed9ng c\u1ee7a vi\u1ec7c thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m thay \u0111\u1ed5i t\u00f9y theo kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c v\u00e0 ki\u1ec3u truy c\u1eadp. M\u1ed9t s\u1ed1 \u1ee9ng d\u1ee5ng nh\u1ea5t \u0111\u1ecbnh c\u00f3 th\u1ec3 c\u00f3 t\u1ef7 l\u1ec7 l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m cao h\u01a1n do \u0111\u1eb7c \u0111i\u1ec3m truy c\u1eadp b\u1ed9 nh\u1edb c\u1ee7a ch\u00fang.<\/p>\n<\/li>\n<\/ol>\n

        C\u00e1c lo\u1ea1i l\u1ed7i Cache<\/p>\n

        L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c ph\u00e2n lo\u1ea1i th\u00e0nh nhi\u1ec1u lo\u1ea1i kh\u00e1c nhau d\u1ef1a tr\u00ean nguy\u00ean nh\u00e2n v\u00e0 ki\u1ebfn tr\u00fac c\u1ee7a h\u1ec7 th\u1ed1ng. C\u00e1c lo\u1ea1i l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n\n\n\n\n\n\n\n\n
        Lo\u1ea1i b\u1ed9 nh\u1edb \u0111\u1ec7m b\u1ecb thi\u1ebfu<\/strong><\/th>\nS\u1ef1 mi\u00eau t\u1ea3<\/strong><\/th>\n<\/tr>\n<\/thead>\n
        Thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m b\u1eaft bu\u1ed9c<\/td>\nX\u1ea3y ra khi m\u1ed9t m\u1ee5c d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp l\u1ea7n \u0111\u1ea7u ti\u00ean v\u00e0 kh\u00f4ng c\u00f3 trong b\u1ed9 \u0111\u1ec7m.<\/td>\n<\/tr>\n
        Dung l\u01b0\u1ee3ng b\u1ed9 nh\u1edb cache b\u1ecf l\u1ee1<\/td>\nX\u1ea3y ra khi b\u1ed9 \u0111\u1ec7m \u0111\u1ea7y v\u00e0 c\u1ea7n thay th\u1ebf m\u1ee5c hi\u1ec7n c\u00f3 b\u1eb1ng m\u1ee5c m\u1edbi.<\/td>\n<\/tr>\n
        Thi\u1ebfu b\u1ed9 \u0111\u1ec7m xung \u0111\u1ed9t<\/td>\nX\u1ea3y ra khi nhi\u1ec1u m\u1ee5c d\u1eef li\u1ec7u tranh gi\u00e0nh c\u00f9ng m\u1ed9t khe c\u1eafm b\u1ed9 nh\u1edb \u0111\u1ec7m, d\u1eabn \u0111\u1ebfn xung \u0111\u1ed9t v\u00e0 x\u00f3a b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/td>\n<\/tr>\n
        Thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m k\u1ebft h\u1ee3p<\/td>\nX\u1ea3y ra trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111a b\u1ed9 x\u1eed l\u00fd c\u00f3 b\u1ed9 \u0111\u1ec7m chung khi b\u1ed9 x\u1eed l\u00fd c\u1ea7n t\u00ecm n\u1ea1p d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c b\u1ed9 x\u1eed l\u00fd kh\u00e1c s\u1eeda \u0111\u1ed5i.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng Cache miss, c\u00e1c v\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p li\u00ean quan \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng.<\/h2>\n

        L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c qu\u1ea3n l\u00fd v\u00e0 gi\u1ea3m thi\u1ec3u b\u1eb1ng nhi\u1ec1u k\u1ef9 thu\u1eadt kh\u00e1c nhau:<\/p>\n

          \n
        1. \n

          \u0110i\u1ec1u ch\u1ec9nh b\u1ed9 \u0111\u1ec7m:<\/strong> \u0110i\u1ec1u ch\u1ec9nh b\u1ed9 \u0111\u1ec7m ph\u00f9 h\u1ee3p bao g\u1ed3m vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh k\u00edch th\u01b0\u1edbc b\u1ed9 \u0111\u1ec7m, t\u00ednh li\u00ean k\u1ebft v\u00e0 c\u00e1c ch\u00ednh s\u00e1ch thay th\u1ebf \u0111\u1ec3 ph\u00f9 h\u1ee3p nh\u1ea5t v\u1edbi kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c v\u00e0 ki\u1ec3u truy c\u1eadp c\u1ee7a \u1ee9ng d\u1ee5ng.<\/p>\n<\/li>\n

        2. \n

          T\u00ecm n\u1ea1p tr\u01b0\u1edbc:<\/strong> K\u1ef9 thu\u1eadt t\u00ecm n\u1ea1p tr\u01b0\u1edbc ph\u1ea7n c\u1ee9ng c\u00f3 th\u1ec3 d\u1ef1 \u0111o\u00e1n nhu c\u1ea7u d\u1eef li\u1ec7u v\u00e0 t\u00ecm n\u1ea1p ch\u00fang v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m tr\u01b0\u1edbc khi ch\u00fang \u0111\u01b0\u1ee3c truy c\u1eadp m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng, gi\u00fap gi\u1ea3m thi\u1ec3u t\u00ecnh tr\u1ea1ng l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<\/li>\n

        3. \n

          T\u1ed1i \u01b0u h\u00f3a ph\u1ea7n m\u1ec1m:<\/strong> C\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n c\u00f3 th\u1ec3 t\u1ed1i \u01b0u h\u00f3a m\u00e3 c\u1ee7a h\u1ecd \u0111\u1ec3 gi\u1ea3m thi\u1ec3u l\u1ed7i b\u1ed9 \u0111\u1ec7m b\u1eb1ng c\u00e1ch c\u1ea3i thi\u1ec7n v\u1ecb tr\u00ed kh\u00f4ng gian v\u00e0 th\u1eddi gian, gi\u1ea3m s\u1ef1 ph\u1ee5 thu\u1ed9c d\u1eef li\u1ec7u v\u00e0 s\u1eed d\u1ee5ng c\u1ea5u tr\u00fac d\u1eef li\u1ec7u ph\u00f9 h\u1ee3p v\u1edbi k\u00edch th\u01b0\u1edbc d\u00f2ng b\u1ed9 \u0111\u1ec7m.<\/p>\n<\/li>\n

        4. \n

          Ph\u00e2n c\u1ea5p b\u1ed9 \u0111\u1ec7m:<\/strong> H\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p b\u1ed9 nh\u1edb \u0111\u1ec7m nhi\u1ec1u c\u1ea5p c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3m t\u1ef7 l\u1ec7 b\u1ecf s\u00f3t b\u1ed9 nh\u1edb \u0111\u1ec7m t\u1ed5ng th\u1ec3 b\u1eb1ng c\u00e1ch \u01b0u ti\u00ean d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean v\u00e0 gi\u1ea3m s\u1ef1 tranh ch\u1ea5p gi\u1eefa c\u00e1c c\u1ea5p \u0111\u1ed9 b\u1ed9 nh\u1edb \u0111\u1ec7m kh\u00e1c nhau.<\/p>\n<\/li>\n

        5. \n

          B\u1ed9 nh\u1edb \u0111\u1ec7m kh\u00f4ng ch\u1eb7n:<\/strong> B\u1ed9 nh\u1edb \u0111\u1ec7m kh\u00f4ng ch\u1eb7n ho\u1eb7c kh\u00f4ng xung \u0111\u1ed9t c\u00f3 th\u1ec3 gi\u1ea3m thi\u1ec3u t\u00ecnh tr\u1ea1ng thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m xung \u0111\u1ed9t b\u1eb1ng c\u00e1ch cho ph\u00e9p \u0111\u1ecdc ho\u1eb7c ghi nhi\u1ec1u d\u00f2ng b\u1ed9 nh\u1edb \u0111\u1ec7m c\u00f9ng m\u1ed9t l\u00fac.<\/p>\n<\/li>\n<\/ol>\n

          C\u00e1c \u0111\u1eb7c \u0111i\u1ec3m ch\u00ednh v\u00e0 c\u00e1c so s\u00e1nh kh\u00e1c v\u1edbi c\u00e1c thu\u1eadt ng\u1eef t\u01b0\u01a1ng t\u1ef1 d\u01b0\u1edbi d\u1ea1ng b\u1ea3ng v\u00e0 danh s\u00e1ch.<\/h2>\n\n\n\n\n\n\n\n\n\n
          \u0110\u1eb7c tr\u01b0ng<\/strong><\/th>\nThi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m<\/strong><\/th>\nL\u01b0\u1ee3t truy c\u1eadp b\u1ed9 \u0111\u1ec7m<\/strong><\/th>\n<\/tr>\n<\/thead>\n
          S\u1ef1 \u0111\u1ecbnh ngh\u0129a<\/td>\nD\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u kh\u00f4ng \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/td>\nD\u1eef li\u1ec7u \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/td>\n<\/tr>\n
          T\u00e1c \u0111\u1ed9ng \u0111\u1ebfn hi\u1ec7u su\u1ea5t<\/td>\nT\u0103ng \u0111\u1ed9 tr\u1ec5 v\u00e0 th\u1eddi gian truy c\u1eadp.<\/td>\nGi\u1ea3m \u0111\u1ed9 tr\u1ec5 v\u00e0 th\u1eddi gian truy c\u1eadp.<\/td>\n<\/tr>\n
          M\u1ee5c ti\u00eau hi\u1ec7u qu\u1ea3<\/td>\nGi\u1ea3m thi\u1ec3u l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t.<\/td>\nT\u1ed1i \u0111a h\u00f3a s\u1ed1 l\u1ea7n truy c\u1eadp b\u1ed9 \u0111\u1ec7m \u0111\u1ec3 c\u1ea3i thi\u1ec7n hi\u1ec7u su\u1ea5t.<\/td>\n<\/tr>\n
          T\u00ednh th\u01b0\u1eddng xuy\u00ean<\/td>\nC\u00f3 th\u1ec3 x\u1ea3y ra th\u01b0\u1eddng xuy\u00ean, t\u00f9y theo kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c.<\/td>\nD\u1ef1 ki\u1ebfn s\u1ebd x\u1ea3y ra th\u01b0\u1eddng xuy\u00ean trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a t\u1ed1t.<\/td>\n<\/tr>\n
          C\u00e1c gi\u1ea3i ph\u00e1p<\/td>\n\u0110i\u1ec1u ch\u1ec9nh b\u1ed9 \u0111\u1ec7m, t\u00ecm n\u1ea1p tr\u01b0\u1edbc, t\u1ed1i \u01b0u h\u00f3a ph\u1ea7n m\u1ec1m.<\/td>\nPh\u00e2n c\u1ea5p b\u1ed9 \u0111\u1ec7m, ch\u00ednh s\u00e1ch thay th\u1ebf, t\u00ecm n\u1ea1p tr\u01b0\u1edbc ph\u1ea7n c\u1ee9ng.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

          C\u00e1c quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 trong t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn Cache miss.<\/h2>\n

          Khi c\u00f4ng ngh\u1ec7 ti\u1ebfn b\u1ed9, nh\u1eefng n\u1ed7 l\u1ef1c \u0111ang \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a h\u01a1n n\u1eefa h\u1ec7 th\u1ed1ng b\u1ed9 \u0111\u1ec7m v\u00e0 gi\u1ea3m thi\u1ec3u l\u1ed7i b\u1ed9 \u0111\u1ec7m. M\u1ed9t s\u1ed1 quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 trong t\u01b0\u01a1ng lai bao g\u1ed3m:<\/p>\n

            \n
          1. \n

            Ch\u00ednh s\u00e1ch thay th\u1ebf th\u00f4ng minh h\u01a1n:<\/strong> S\u1eed d\u1ee5ng m\u00e1y h\u1ecdc v\u00e0 tr\u00ed tu\u1ec7 nh\u00e2n t\u1ea1o \u0111\u1ec3 \u0111i\u1ec1u ch\u1ec9nh linh ho\u1ea1t c\u00e1c ch\u00ednh s\u00e1ch thay th\u1ebf b\u1ed9 \u0111\u1ec7m d\u1ef1a tr\u00ean h\u00e0nh vi \u1ee9ng d\u1ee5ng v\u00e0 ki\u1ec3u truy c\u1eadp.<\/p>\n<\/li>\n

          2. \n

            \u0110\u1ed3ng thi\u1ebft k\u1ebf ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m:<\/strong> Thi\u1ebft k\u1ebf h\u1ee3p t\u00e1c gi\u1eefa c\u00e1c nh\u00e0 ph\u00e1t tri\u1ec3n ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m \u0111\u1ec3 t\u1ea1o ra ki\u1ebfn tr\u00fac b\u1ed9 \u0111\u1ec7m ph\u00f9 h\u1ee3p h\u01a1n v\u1edbi y\u00eau c\u1ea7u c\u1ee7a c\u00e1c \u1ee9ng d\u1ee5ng hi\u1ec7n \u0111\u1ea1i.<\/p>\n<\/li>\n

          3. \n

            N\u00e9n b\u1ed9 \u0111\u1ec7m:<\/strong> K\u1ef9 thu\u1eadt n\u00e9n d\u1eef li\u1ec7u trong b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ec3 ch\u1ee9a nhi\u1ec1u th\u00f4ng tin h\u01a1n trong k\u00edch th\u01b0\u1edbc b\u1ed9 nh\u1edb \u0111\u1ec7m nh\u1ea5t \u0111\u1ecbnh, c\u00f3 kh\u1ea3 n\u0103ng gi\u1ea3m thi\u1ec3u t\u00ecnh tr\u1ea1ng thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<\/li>\n

          4. \n

            B\u1ed9 nh\u1edb \u0111\u1ec7m li\u00ean t\u1ee5c:<\/strong> T\u00edch h\u1ee3p c\u00e1c c\u00f4ng ngh\u1ec7 b\u1ed9 nh\u1edb li\u00ean t\u1ee5c v\u00e0o h\u1ec7 th\u1ed1ng ph\u00e2n c\u1ea5p b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ec3 mang l\u1ea1i kh\u1ea3 n\u0103ng l\u01b0u tr\u1eef d\u1eef li\u1ec7u t\u1ed1t h\u01a1n v\u00e0 gi\u1ea3m c\u00e1c h\u00ecnh ph\u1ea1t do l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m.<\/p>\n<\/li>\n<\/ol>\n

            C\u00e1ch s\u1eed d\u1ee5ng m\u00e1y ch\u1ee7 proxy ho\u1eb7c li\u00ean k\u1ebft v\u1edbi l\u1ed7i Cache.<\/h2>\n

            M\u00e1y ch\u1ee7 proxy \u0111\u00f3ng vai tr\u00f2 trung gian gi\u1eefa m\u00e1y kh\u00e1ch v\u00e0 m\u00e1y ch\u1ee7 web, chuy\u1ec3n ti\u1ebfp y\u00eau c\u1ea7u c\u1ee7a m\u00e1y kh\u00e1ch v\u00e0 l\u01b0u v\u00e0o b\u1ed9 nh\u1edb \u0111\u1ec7m n\u1ed9i dung \u0111\u01b0\u1ee3c truy c\u1eadp th\u01b0\u1eddng xuy\u00ean \u0111\u1ec3 c\u1ea3i thi\u1ec7n th\u1eddi gian ph\u1ea3n h\u1ed3i. L\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u00f3ng m\u1ed9t vai tr\u00f2 quan tr\u1ecdng trong hi\u1ec7u su\u1ea5t c\u1ee7a m\u00e1y ch\u1ee7 proxy v\u00ec n\u00f3 quy\u1ebft \u0111\u1ecbnh t\u1ea7n su\u1ea5t proxy ph\u1ea3i truy c\u1eadp v\u00e0o m\u00e1y ch\u1ee7 g\u1ed1c \u0111\u1ec3 c\u00f3 n\u1ed9i dung m\u1edbi.<\/p>\n

            M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 t\u1eadn d\u1ee5ng t\u00ecnh tr\u1ea1ng thi\u1ebfu b\u1ed9 nh\u1edb \u0111\u1ec7m theo nhi\u1ec1u c\u00e1ch:<\/p>\n

              \n
            1. \n

              B\u1ed9 nh\u1edb \u0111\u1ec7m:<\/strong> M\u00e1y ch\u1ee7 proxy duy tr\u00ec b\u1ed9 \u0111\u1ec7m \u0111\u1ec3 l\u01b0u tr\u1eef c\u00e1c trang web \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u v\u00e0 c\u00e1c t\u00e0i nguy\u00ean li\u00ean quan c\u1ee7a ch\u00fang. L\u1ed7i b\u1ed9 \u0111\u1ec7m x\u1ea3y ra khi n\u1ed9i dung \u0111\u01b0\u1ee3c y\u00eau c\u1ea7u kh\u00f4ng c\u00f3 trong b\u1ed9 \u0111\u1ec7m, khi\u1ebfn proxy t\u00ecm n\u1ea1p n\u1ed9i dung \u0111\u00f3 t\u1eeb m\u00e1y ch\u1ee7 g\u1ed1c.<\/p>\n<\/li>\n

            2. \n

              Ch\u00ednh s\u00e1ch b\u1ed9 \u0111\u1ec7m:<\/strong> Qu\u1ea3n tr\u1ecb vi\u00ean proxy c\u00f3 th\u1ec3 x\u00e1c \u0111\u1ecbnh ch\u00ednh s\u00e1ch b\u1ed9 \u0111\u1ec7m \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh th\u1eddi gian l\u01b0u tr\u1eef n\u1ed9i dung trong b\u1ed9 \u0111\u1ec7m tr\u01b0\u1edbc khi n\u00f3 b\u1ecb coi l\u00e0 c\u0169. \u0110i\u1ec1u n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u1ea7n su\u1ea5t l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m v\u00e0 \u0111\u1ed9 m\u1edbi c\u1ee7a n\u1ed9i dung do proxy cung c\u1ea5p.<\/p>\n<\/li>\n

            3. \n

              C\u00e2n b\u1eb1ng t\u1ea3i:<\/strong> M\u1ed9t s\u1ed1 m\u00e1y ch\u1ee7 proxy s\u1eed d\u1ee5ng t\u1ef7 l\u1ec7 l\u1ed7i b\u1ed9 \u0111\u1ec7m l\u00e0m th\u01b0\u1edbc \u0111o \u0111\u1ec3 ph\u00e2n ph\u1ed1i y\u00eau c\u1ea7u c\u1ee7a m\u00e1y kh\u00e1ch gi\u1eefa nhi\u1ec1u m\u00e1y ch\u1ee7 ph\u1ee5 tr\u1ee3, t\u1ed1i \u01b0u h\u00f3a c\u00e2n b\u1eb1ng t\u1ea3i \u0111\u1ec3 c\u00f3 hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n.<\/p>\n<\/li>\n

            4. \n

              L\u1ecdc n\u1ed9i dung:<\/strong> M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 s\u1eed d\u1ee5ng d\u1eef li\u1ec7u b\u1ecb thi\u1ebfu trong b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh c\u00e1c m\u1ed1i \u0111e d\u1ecda b\u1ea3o m\u1eadt ti\u1ec1m \u1ea9n ho\u1eb7c c\u00e1c ho\u1ea1t \u0111\u1ed9ng \u0111\u00e1ng ng\u1edd, cung c\u1ea5p th\u00eam m\u1ed9t l\u1edbp b\u1ea3o v\u1ec7 cho m\u00e1y kh\u00e1ch.<\/p>\n<\/li>\n<\/ol>\n

              Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n

              \u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 l\u1ed7i Cache, h\u00e3y xem x\u00e9t kh\u00e1m ph\u00e1 c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n

                \n
              1. \n

                Cache nh\u1edb v\u00e0 tr\u00fang<\/a> \u2013 Trang Wikipedia gi\u1ea3i th\u00edch chi ti\u1ebft c\u00e1c kh\u00e1i ni\u1ec7m v\u1ec1 l\u1ed7i nh\u1edb cache v\u00e0 l\u1ea7n truy c\u1eadp.<\/p>\n<\/li>\n

              2. \n

                Hi\u1ec3u v\u1ec1 l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m<\/a> \u2013 H\u01b0\u1edbng d\u1eabn to\u00e0n di\u1ec7n \u0111\u1ec3 hi\u1ec3u c\u00e1c l\u1ed7i b\u1ed9 nh\u1edb \u0111\u1ec7m v\u00e0 t\u00e1c \u0111\u1ed9ng c\u1ee7a ch\u00fang \u0111\u1ebfn hi\u1ec7u su\u1ea5t.<\/p>\n<\/li>\n

              3. \n

                B\u1ed9 nh\u1edb \u0111\u1ec7m v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a n\u00f3<\/a> \u2013 H\u01b0\u1edbng d\u1eabn d\u00e0nh cho ng\u01b0\u1eddi m\u1edbi b\u1eaft \u0111\u1ea7u v\u1ec1 b\u1ed9 nh\u1edb \u0111\u1ec7m v\u00e0 t\u1ea7m quan tr\u1ecdng c\u1ee7a n\u00f3 trong c\u00e1c h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh hi\u1ec7n \u0111\u1ea1i.<\/p>\n<\/li>\n

              4. \n

                C\u00e1c m\u1eabu v\u00e0 gi\u1ea3i ph\u00e1p b\u1ecf l\u1ee1 b\u1ed9 \u0111\u1ec7m<\/a> \u2013 M\u1ed9t b\u00e0i vi\u1ebft h\u1ecdc thu\u1eadt kh\u00e1m ph\u00e1 c\u00e1c m\u00f4 h\u00ecnh v\u00e0 gi\u1ea3i ph\u00e1p b\u1ecf s\u00f3t b\u1ed9 nh\u1edb \u0111\u1ec7m \u0111\u1ec3 truy c\u1eadp b\u1ed9 nh\u1edb hi\u1ec7u qu\u1ea3.<\/p>\n<\/li>\n<\/ol>","protected":false},"featured_media":476158,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-476157","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about Cache miss: A Comprehensive Overview<\/mark>","faq_items":[{"question":"What is a cache miss?","answer":"

                A cache miss refers to a situation where the requested data is not found in the cache memory of a computer system or proxy server. When this happens, the system needs to fetch the data from the main memory or external storage, resulting in increased access time and latency.<\/p>"},{"question":"How does cache miss affect system performance?","answer":"

                Cache misses can significantly impact system performance, leading to increased latency and slower data retrieval. The frequency of cache misses can vary based on the workload and access patterns of the application. Proper cache tuning, prefetching, and software optimization are some of the techniques used to mitigate the impact of cache misses and improve overall system efficiency.<\/p>"},{"question":"What are the types of cache misses?","answer":"

                Cache misses can be classified into several types based on their causes and system architecture. The common types include:<\/p>

                1. Compulsory Cache Miss: Occurs when a data item is accessed for the first time and is not present in the cache.<\/p><\/li>

                2. Capacity Cache Miss: Happens when the cache is full and needs to replace an existing entry with a new one.<\/p><\/li>

                3. Conflict Cache Miss: Occurs when multiple data items vie for the same cache slot, resulting in conflicts and cache evictions.<\/p><\/li>

                4. Coherence Cache Miss: Happens in multiprocessor systems with shared caches when a processor needs to fetch data modified by another processor.<\/p><\/li><\/ol>"},{"question":"How can cache misses be minimized?","answer":"

                  To reduce cache misses and improve system performance, several strategies can be employed:<\/p>

                  1. Cache Tuning: Adjusting the cache size, associativity, and replacement policies to match the workload and access patterns of the application.<\/p><\/li>

                  2. Prefetching: Using hardware prefetching techniques to anticipate data needs and fetch them into the cache before they are explicitly accessed.<\/p><\/li>

                  3. Software Optimization: Optimizing code to improve spatial and temporal locality, reducing data dependencies, and using cache-friendly data structures.<\/p><\/li><\/ol>"},{"question":"How are proxy servers associated with cache misses?","answer":"

                    Proxy servers act as intermediaries between clients and web servers. They use cache miss data to store frequently accessed content and reduce response times. When a requested resource is not found in the cache, the proxy fetches it from the origin server, impacting overall performance.<\/p>"},{"question":"What does the future hold for cache miss technology?","answer":"

                    The future of cache miss technology involves smarter replacement policies, hardware and software co-design, cache compression, and the integration of persistent memory technologies. These advancements aim to further optimize cache systems and minimize cache misses, leading to even faster and more efficient data retrieval processes.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476157","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki"}],"about":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/types\/wiki"}],"version-history":[{"count":0,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/476157\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/476158"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=476157"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}