{"id":892,"date":"2026-04-06T05:17:05","date_gmt":"2026-04-06T05:17:05","guid":{"rendered":"https:\/\/www.viz-tools.com\/vn\/optimizing-sensor-data-flows-uml-timing-diagrams\/"},"modified":"2026-04-06T05:17:05","modified_gmt":"2026-04-06T05:17:05","slug":"optimizing-sensor-data-flows-uml-timing-diagrams","status":"publish","type":"post","link":"https:\/\/www.viz-tools.com\/vn\/optimizing-sensor-data-flows-uml-timing-diagrams\/","title":{"rendered":"Nghi\u00ean c\u1ee9u \u0111i\u1ec3n h\u00ecnh: T\u1ed1i \u01b0u h\u00f3a lu\u1ed3ng x\u1eed l\u00fd d\u1eef li\u1ec7u c\u1ea3m bi\u1ebfn b\u1eb1ng bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML"},"content":{"rendered":"

Trong l\u0129nh v\u1ef1c h\u1ec7 th\u1ed1ng nh\u00fang v\u00e0 \u0111i\u1ec7n to\u00e1n th\u1eddi gian th\u1ef1c, \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 th\u1eddi gian kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn m\u00e0 l\u00e0 m\u1ed9t y\u00eau c\u1ea7u b\u1eaft bu\u1ed9c. Khi x\u1eed l\u00fd d\u1eef li\u1ec7u c\u1ea3m bi\u1ebfn, th\u1eddi \u0111i\u1ec3m th\u00f4ng tin \u0111\u1ebfn th\u01b0\u1eddng quan tr\u1ecdng kh\u00f4ng k\u00e9m ch\u00ednh th\u00f4ng tin \u0111\u00f3. \u0110\u1ed9 tr\u1ec5, \u0111\u1ed9 rung (jitter) v\u00e0 c\u1eeda s\u1ed5 x\u1eed l\u00fd quy\u1ebft \u0111\u1ecbnh li\u1ec7u m\u1ed9t h\u1ec7 th\u1ed1ng ho\u1ea1t \u0111\u1ed9ng an to\u00e0n hay th\u1ea5t b\u1ea1i th\u1ea3m kh\u1ed1c. H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 m\u1ed9t nghi\u00ean c\u1ee9u \u0111i\u1ec3n h\u00ecnh th\u1ef1c t\u1ebf t\u1eadp trung v\u00e0o vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a lu\u1ed3ng x\u1eed l\u00fd d\u1eef li\u1ec7u c\u1ea3m bi\u1ebfn b\u1eb1ng bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML. Ch\u00fang ta s\u1ebd xem x\u00e9t c\u00e1ch tr\u1ef1c quan h\u00f3a c\u00e1c m\u1ed1i quan h\u1ec7 th\u1eddi gian cho ph\u00e9p c\u00e1c k\u1ef9 s\u01b0 x\u00e1c \u0111\u1ecbnh c\u00e1c n\u00fat c\u1ed5 chai v\u00e0 th\u1ef1c hi\u1ec7n c\u00e1c thay \u0111\u1ed5i c\u1ea5u tr\u00fac nh\u1eb1m n\u00e2ng cao hi\u1ec7u su\u1ea5t m\u00e0 kh\u00f4ng ph\u00e1t sinh chi ph\u00ed ph\u1ea7n c\u1ee9ng.<\/p>\n

M\u1ee5c ti\u00eau \u1edf \u0111\u00e2y kh\u00f4ng ph\u1ea3i l\u00e0 gi\u1edbi thi\u1ec7u m\u1ed9t c\u00f4ng c\u1ee5 m\u1edbi, m\u00e0 l\u00e0 tinh ch\u1ec9nh ph\u01b0\u01a1ng ph\u00e1p m\u00f4 h\u00ecnh h\u00f3a. B\u1eb1ng c\u00e1ch chuy\u1ec3n tr\u1ecdng t\u00e2m t\u1eeb lu\u1ed3ng d\u1eef li\u1ec7u sang lu\u1ed3ng th\u1eddi gian, c\u00e1c nh\u00f3m c\u00f3 th\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c ph\u1ee5 thu\u1ed9c \u1ea9n m\u00e0 c\u00e1c bi\u1ec3u \u0111\u1ed3 tr\u00ecnh t\u1ef1 ti\u00eau chu\u1ea9n th\u01b0\u1eddng b\u1ecf s\u00f3t. T\u00e0i li\u1ec7u n\u00e0y tr\u00ecnh b\u00e0y chi ti\u1ebft ph\u01b0\u01a1ng ph\u00e1p lu\u1eadn, quy tr\u00ecnh ph\u00e2n t\u00edch v\u00e0 c\u00e1c k\u1ebft qu\u1ea3 c\u00f3 th\u1ec3 \u0111o l\u01b0\u1eddng \u0111\u01b0\u1ee3c khi \u00e1p d\u1ee5ng c\u00e1c r\u00e0ng bu\u1ed9c th\u1eddi gian cho ki\u1ebfn tr\u00fac m\u1ea1ng c\u1ea3m bi\u1ebfn IoT \u0111i\u1ec3n h\u00ecnh.<\/p>\n

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\"Infographic:<\/figure>\n<\/div>\n

\ud83d\udcca Hi\u1ec3u c\u00e1c r\u00e0ng bu\u1ed9c th\u1eddi gian trong h\u1ec7 th\u1ed1ng nh\u00fang<\/h2>\n

H\u1ec7 th\u1ed1ng nh\u00fang ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi c\u00e1c gi\u1edbi h\u1ea1n t\u00e0i nguy\u00ean nghi\u00eam ng\u1eb7t. B\u1ed9 nh\u1edb, s\u1ee9c m\u1ea1nh x\u1eed l\u00fd v\u00e0 n\u0103ng l\u01b0\u1ee3ng l\u00e0 c\u00e1c ngu\u1ed3n t\u00e0i nguy\u00ean h\u1eefu h\u1ea1n. Khi nhi\u1ec1u c\u1ea3m bi\u1ebfn cung c\u1ea5p d\u1eef li\u1ec7u cho m\u1ed9t \u0111\u01a1n v\u1ecb x\u1eed l\u00fd trung t\u00e2m, th\u1ee9 t\u1ef1 v\u00e0 th\u1eddi \u0111i\u1ec3m thu th\u1eadp d\u1eef li\u1ec7u tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p. C\u01a1 ch\u1ebf th\u0103m d\u00f2 (polling) c\u00f3 th\u1ec3 b\u1ecf l\u1ee1 c\u00e1c s\u1ef1 ki\u1ec7n c\u00f3 th\u1eddi l\u01b0\u1ee3ng ng\u1eafn. Tr\u00ecnh x\u1eed l\u00fd ng\u1eaft (interrupt handler) c\u00f3 th\u1ec3 l\u00e0m thi\u1ebfu h\u1ee5t t\u00e0i nguy\u00ean cho m\u1ed9t t\u00e1c v\u1ee5 quan tr\u1ecdng. N\u1ebfu kh\u00f4ng c\u00f3 b\u1ea3n \u0111\u1ed3 th\u1eddi gian r\u00f5 r\u00e0ng, c\u00e1c v\u1ea5n \u0111\u1ec1 n\u00e0y s\u1ebd v\u1eabn v\u00f4 h\u00ecnh cho \u0111\u1ebfn khi tri\u1ec3n khai.<\/p>\n

S\u01a1 \u0111\u1ed3 lu\u1ed3ng ti\u00eau chu\u1ea9n m\u00f4 t\u1ea3c\u00e1i g\u00ec<\/em>x\u1ea3y ra. Bi\u1ec3u \u0111\u1ed3 tr\u00ecnh t\u1ef1 m\u00f4 t\u1ea3ai<\/em>n\u00f3i chuy\u1ec7n v\u1edbiai<\/em>. Bi\u1ec3u \u0111\u1ed3 th\u1eddi gian m\u00f4 t\u1ea3khi n\u00e0o<\/em>c\u00e1c s\u1ef1 ki\u1ec7n x\u1ea3y ra so v\u1edbi nhau nh\u01b0 th\u1ebf n\u00e0o. S\u1ef1 ph\u00e2n bi\u1ec7t n\u00e0y l\u00e0 c\u1ef1c k\u1ef3 quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c m\u1ea1ng c\u1ea3m bi\u1ebfn, n\u01a1i c\u1eeda s\u1ed5 c\u01a1 h\u1ed9i \u0111\u1ec3 x\u1eed l\u00fd t\u00edn hi\u1ec7u \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi th\u1ebf gi\u1edbi v\u1eadt l\u00fd.<\/p>\n

C\u00e1c ch\u1ec9 s\u1ed1 th\u1eddi gian ch\u00ednh<\/h3>\n
    \n
  • \u0110\u1ed9 tr\u1ec5:<\/strong>T\u1ed5ng th\u1eddi gian tr\u1ec5 t\u1eeb khi c\u1ea3m bi\u1ebfn \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t \u0111\u1ebfn khi d\u1eef li\u1ec7u s\u1eb5n s\u00e0ng.<\/li>\n
  • \u0110\u1ed9 rung (Jitter):<\/strong>S\u1ef1 bi\u1ebfn thi\u00ean c\u1ee7a \u0111\u1ed9 tr\u1ec5 qua nhi\u1ec1u s\u1ef1 ki\u1ec7n.<\/li>\n
  • Th\u00f4ng l\u01b0\u1ee3ng:<\/strong>Kh\u1ed1i l\u01b0\u1ee3ng d\u1eef li\u1ec7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd tr\u00ean m\u1ed9t \u0111\u01a1n v\u1ecb th\u1eddi gian.<\/li>\n
  • H\u1ea1n ch\u00f3t:<\/strong>Th\u1eddi gian t\u1ed1i \u0111a cho ph\u00e9p \u0111\u1ec3 ho\u00e0n th\u00e0nh m\u1ed9t t\u00e1c v\u1ee5 tr\u01b0\u1edbc khi d\u1eef li\u1ec7u tr\u1edf n\u00ean kh\u00f4ng h\u1ee3p l\u1ec7.<\/li>\n<\/ul>\n

    Vi\u1ec7c gi\u1ea3i quy\u1ebft c\u00e1c ch\u1ec9 s\u1ed1 n\u00e0y \u0111\u00f2i h\u1ecfi m\u1ed9t m\u00f4 h\u00ecnh n\u1eafm b\u1eaft th\u1eddi gian m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng. Bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML cung c\u1ea5p m\u1ed9t h\u1ec7 t\u1ecda \u0111\u1ed9 cho ph\u00e2n t\u00edch n\u00e0y, cho ph\u00e9p \u0111\u1eb7t c\u00e1c s\u1ef1 ki\u1ec7n d\u1ecdc theo tr\u1ee5c th\u1eddi gian n\u1eb1m ngang.<\/p>\n

    \ud83d\udee0\ufe0f Gi\u1ea3i ph\u1eabu bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML<\/h2>\n

    \u0110\u1ec3 s\u1eed d\u1ee5ng k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a n\u00e0y m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3, ng\u01b0\u1eddi ta ph\u1ea3i hi\u1ec3u c\u00e1c th\u00e0nh ph\u1ea7n c\u1ee7a n\u00f3. Kh\u00e1c v\u1edbi bi\u1ec3u \u0111\u1ed3 tr\u00ecnh t\u1ef1 t\u1eadp trung v\u00e0o t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng, bi\u1ec3u \u0111\u1ed3 th\u1eddi gian t\u1eadp trung v\u00e0o tr\u1ea1ng th\u00e1i c\u1ee7a c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng theo th\u1eddi gian. Tr\u1ee5c n\u1eb1m ngang bi\u1ec3u th\u1ecb th\u1eddi gian, ti\u1ebfn tri\u1ec3n t\u1eeb tr\u00e1i sang ph\u1ea3i. Tr\u1ee5c d\u1ecdc bi\u1ec3u th\u1ecb c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng ri\u00eang bi\u1ec7t, \u0111\u01b0\u1eddng s\u1ef1 s\u1ed1ng (lifeline) ho\u1eb7c c\u00e1c bi\u1ebfn.<\/p>\n

    C\u00e1c th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i<\/h3>\n
      \n
    • \u0110\u01b0\u1eddng s\u1ef1 s\u1ed1ng (Lifeline):<\/strong>Bi\u1ec3u th\u1ecb s\u1ef1 t\u1ed3n t\u1ea1i c\u1ee7a m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng ho\u1eb7c bi\u1ebfn trong m\u1ed9t kho\u1ea3ng th\u1eddi gian.<\/li>\n
    • S\u1ef1 xu\u1ea5t hi\u1ec7n tr\u1ea1ng th\u00e1i:<\/strong> Ch\u1ec9 ra khi n\u00e0o m\u1ed9t \u0111\u1ed1i t\u01b0\u1ee3ng \u1edf trong m\u1ed9t tr\u1ea1ng th\u00e1i c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: ““Ch\u1edd”<\/em>, “Ho\u1ea1t \u0111\u1ed9ng”<\/em>, “Ng\u1ee7”<\/em>).<\/li>\n
    • “\u0110i\u1ec1u ki\u1ec7n: “<\/strong> M\u1ed9t kho\u1ea3ng th\u1eddi gian trong \u0111\u00f3 m\u1ed9t \u0111i\u1ec1u ki\u1ec7n ph\u1ea3i \u0111\u00fang ho\u1eb7c sai.<\/li>\n
    • “S\u1ef1 ki\u1ec7n: “<\/strong> M\u1ed9t th\u1eddi \u0111i\u1ec3m c\u1ee5 th\u1ec3 m\u00e0 t\u1ea1i \u0111\u00f3 m\u1ed9t h\u00e0nh \u0111\u1ed9ng x\u1ea3y ra (v\u00ed d\u1ee5: ““K\u00edch ho\u1ea1t ng\u1eaft”<\/em>).<\/li>\n
    • “T\u00edn hi\u1ec7u: “<\/strong> C\u00e1c tin nh\u1eafn \u0111\u01b0\u1ee3c truy\u1ec1n gi\u1eefa c\u00e1c \u0111\u01b0\u1eddng \u0111\u1eddi, \u0111\u01b0\u1ee3c ch\u00fa th\u00edch v\u1edbi th\u1eddi gian c\u1ee7a ch\u00fang.<\/li>\n<\/ul>\n

      Khi x\u00e2y d\u1ef1ng bi\u1ec3u \u0111\u1ed3 cho x\u1eed l\u00fd c\u1ea3m bi\u1ebfn, c\u00e1c \u0111\u01b0\u1eddng \u0111\u1eddi th\u01b0\u1eddng \u0111\u1ea1i di\u1ec7n cho ph\u1ea7n c\u1ee9ng c\u1ea3m bi\u1ebfn, b\u1ed9 \u0111i\u1ec1u khi\u1ec3n ng\u1eaft, lu\u1ed3ng x\u1eed l\u00fd ch\u00ednh v\u00e0 bus truy\u1ec1n th\u00f4ng. K\u1ebft n\u1ed1i c\u00e1c th\u00e0nh ph\u1ea7n n\u00e0y v\u1edbi c\u00e1c r\u00e0ng bu\u1ed9c th\u1eddi gian ch\u00ednh x\u00e1c gi\u00fap x\u00e1c \u0111\u1ecbnh n\u01a1i d\u1eef li\u1ec7u \u0111ang ch\u1edd v\u00e0 n\u01a1i s\u1ee9c m\u1ea1nh x\u1eed l\u00fd b\u1ecb l\u00e3ng ph\u00ed.<\/p>\n

      \ud83d\udce1 K\u1ecbch b\u1ea3n m\u1ea1ng c\u1ea3m bi\u1ebfn<\/h2>\n

      H\u00e3y xem x\u00e9t m\u1ed9t h\u1ec7 th\u1ed1ng gi\u00e1m s\u00e1t \u0111\u01b0\u1ee3c tri\u1ec3n khai trong m\u00f4i tr\u01b0\u1eddng c\u00f4ng nghi\u1ec7p. H\u1ec7 th\u1ed1ng n\u00e0y t\u1ed5ng h\u1ee3p d\u1eef li\u1ec7u t\u1eeb ba ngu\u1ed3n ri\u00eang bi\u1ec7t:<\/p>\n

        \n
      1. C\u1ea3m bi\u1ebfn rung:<\/strong> L\u1ea5y m\u1eabu t\u1ea7n s\u1ed1 cao (10 kHz) \u0111\u1ec3 theo d\u00f5i s\u1ee9c kh\u1ecfe m\u00e1y m\u00f3c.<\/li>\n
      2. C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9:<\/strong> L\u1ea5y m\u1eabu t\u1ea7n s\u1ed1 th\u1ea5p (1 Hz) \u0111\u1ec3 ki\u1ec3m tra ng\u01b0\u1ee1ng an to\u00e0n.<\/li>\n
      3. C\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed9ng:<\/strong> K\u00edch ho\u1ea1t d\u1ef1a tr\u00ean s\u1ef1 ki\u1ec7n cho c\u1ea3nh b\u00e1o an ninh.<\/li>\n<\/ol>\n

        C\u00e1c c\u1ea3m bi\u1ebfn n\u00e0y k\u1ebft n\u1ed1i v\u1edbi m\u1ed9t vi \u0111i\u1ec1u khi\u1ec3n ph\u1ea3i t\u1ed5ng h\u1ee3p d\u1eef li\u1ec7u v\u00e0 truy\u1ec1n n\u00f3 \u0111\u1ebfn c\u1ed5ng \u0111\u00e1m m\u00e2y. Thi\u1ebft k\u1ebf ban \u0111\u1ea7u s\u1eed d\u1ee5ng m\u1ed9t v\u00f2ng l\u1eb7p th\u0103m d\u00f2 duy nh\u1ea5t \u0111\u1ec3 ki\u1ec3m tra t\u1ea5t c\u1ea3 c\u00e1c c\u1ea3m bi\u1ebfn theo th\u1ee9 t\u1ef1. M\u1eb7c d\u00f9 \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 tri\u1ec3n khai, ph\u01b0\u01a1ng ph\u00e1p n\u00e0y \u0111\u00e3 \u0111\u01b0a ra s\u1ef1 bi\u1ebfn \u0111\u1ed5i \u0111\u00e1ng k\u1ec3 v\u1ec1 \u0111\u1ed9 tr\u1ec5.<\/p>\n

        T\u1ed5ng quan ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng<\/h3>\n\n\n\n\n\n\n\n\n
        Th\u00e0nh ph\u1ea7n<\/th>\nVai tr\u00f2<\/th>\nY\u00eau c\u1ea7u th\u1eddi gian<\/th>\n<\/tr>\n<\/thead>\n
        C\u1ea3m bi\u1ebfn rung<\/td>\nThu th\u1eadp t\u1ed1c \u0111\u1ed9 cao<\/td>\n\u0110\u1ed9 tr\u1ec5 t\u1ed1i \u0111a 100\u03bcs<\/td>\n<\/tr>\n
        C\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9<\/td>\nGi\u00e1m s\u00e1t \u0111\u1ecbnh k\u1ef3<\/td>\n\u0110\u1ed9 tr\u1ec5 t\u1ed1i \u0111a 100ms<\/td>\n<\/tr>\n
        C\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed9ng<\/td>\nPh\u00e1t hi\u1ec7n s\u1ef1 ki\u1ec7n<\/td>\n\u0110\u1ed9 tr\u1ec5 t\u1ed1i \u0111a 500\u03bcs<\/td>\n<\/tr>\n
        C\u1ed5ng \u0111\u00e1m m\u00e2y<\/td>\nTruy\u1ec1n d\u1eef li\u1ec7u<\/td>\n\u0110\u1ed9 tr\u1ec5 t\u1ed1i \u0111a 2s<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Th\u00e1ch th\u1ee9c n\u1eb1m \u1edf bus chia s\u1ebb. Khi c\u1ea3m bi\u1ebfn rung \u0111\u1ed9ng y\u00eau c\u1ea7u truy c\u1eadp t\u1ed1c \u0111\u1ed9 cao, c\u1ea3m bi\u1ebfn nhi\u1ec7t \u0111\u1ed9 v\u00e0 c\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed9ng g\u1eb7p ph\u1ea3i \u0111\u1ed9 tr\u1ec5. M\u00f4 h\u00ecnh ban \u0111\u1ea7u kh\u00f4ng t\u00ednh \u0111\u1ebfn s\u1ef1 tranh ch\u1ea5p bus ho\u1eb7c \u01b0u ti\u00ean ng\u1eaft, d\u1eabn \u0111\u1ebfn vi\u1ec7c b\u1ecf qua th\u1eddi h\u1ea1n trong c\u00e1c t\u00ecnh hu\u1ed1ng quan tr\u1ecdng.<\/p>\n

        \ud83d\udd0d X\u00e1c \u0111\u1ecbnh c\u00e1c v\u1ea5n \u0111\u1ec1 v\u1ec1 \u0111\u1ed9 tr\u1ec5 v\u00e0 \u0111\u1ed9 rung<\/h2>\n

        B\u01b0\u1edbc \u0111\u1ea7u ti\u00ean trong qu\u00e1 tr\u00ecnh t\u1ed1i \u01b0u h\u00f3a l\u00e0 t\u1ea1o bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML c\u01a1 s\u1edf d\u1ef1a tr\u00ean m\u00e3 ki\u1ec3m tra hi\u1ec7n c\u00f3. Bi\u1ec3u di\u1ec5n tr\u1ef1c quan n\u00e0y \u0111\u00e3 l\u00e0m n\u1ed5i b\u1eadt m\u1ed9t s\u1ed1 b\u1ea5t hi\u1ec7u qu\u1ea3 quan tr\u1ecdng.<\/p>\n

        C\u00e1c n\u00fat c\u1ed5 chai \u0111\u00e3 quan s\u00e1t \u0111\u01b0\u1ee3c<\/h3>\n
          \n
        • Chi ph\u00ed ki\u1ec3m tra:<\/strong>V\u00f2ng l\u1eb7p ch\u00ednh \u0111\u00e3 ki\u1ec3m tra c\u1ea3m bi\u1ebfn rung \u0111\u1ed9ng 10.000 l\u1ea7n m\u1ed7i gi\u00e2y, ngay c\u1ea3 khi kh\u00f4ng c\u00f3 d\u1eef li\u1ec7u m\u1edbi s\u1eb5n s\u00e0ng. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 ti\u00eau t\u1ed1n c\u00e1c chu k\u1ef3 CPU c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho c\u00e1c t\u00e1c v\u1ee5 kh\u00e1c.<\/li>\n
        • Ng\u1eaft b\u1ecb ch\u1eb7n:<\/strong>C\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed9ng d\u1ef1a v\u00e0o c\u00e1c ng\u1eaft, nh\u01b0ng c\u1ea3m bi\u1ebfn rung \u0111\u1ed9ng gi\u1eef bus trong th\u1eddi gian d\u00e0i, l\u00e0m ch\u1eadm t\u00edn hi\u1ec7u chuy\u1ec3n \u0111\u1ed9ng.<\/li>\n
        • \u0110\u1ec7m d\u1eef li\u1ec7u:<\/strong>D\u1eef li\u1ec7u trung gian \u0111\u01b0\u1ee3c l\u01b0u tr\u1eef trong m\u1ed9t b\u1ed9 \u0111\u1ec7m duy nh\u1ea5t, g\u00e2y ra n\u00fat c\u1ed5 chai khi vi\u1ec7c truy\u1ec1n d\u1eef li\u1ec7u \u0111\u1ebfn c\u1ed5ng x\u1ea3y ra \u0111\u1ed3ng th\u1eddi v\u1edbi vi\u1ec7c \u0111\u1ecdc c\u1ea3m bi\u1ebfn.<\/li>\n<\/ul>\n

          Bi\u1ec3u \u0111\u1ed3 th\u1eddi gian \u0111\u00e3 l\u00e0m cho \u0111\u1ed9 rung tr\u1edf n\u00ean r\u00f5 r\u00e0ng. Th\u1eddi gian gi\u1eefa k\u00edch ho\u1ea1t chuy\u1ec3n \u0111\u1ed9ng v\u00e0 x\u1eed l\u00fd th\u1ef1c t\u1ebf dao \u0111\u1ed9ng t\u1eeb 200\u03bcs \u0111\u1ebfn 400\u03bcs t\u00f9y thu\u1ed9c v\u00e0o pha l\u1ea5y m\u1eabu rung \u0111\u1ed9ng. S\u1ef1 bi\u1ebfn thi\u00ean n\u00e0y l\u00e0 kh\u00f4ng th\u1ec3 ch\u1ea5p nh\u1eadn \u0111\u01b0\u1ee3c \u0111\u1ed1i v\u1edbi m\u1ed9t h\u1ec7 th\u1ed1ng an ninh y\u00eau c\u1ea7u c\u1ea3nh b\u00e1o ngay l\u1eadp t\u1ee9c.<\/p>\n

          Ph\u00e2n t\u00edch tr\u1ef1c quan<\/h3>\n

          B\u1eb1ng c\u00e1ch \u00e1nh x\u1ea1 c\u00e1c s\u1ef1 ki\u1ec7n tr\u00ean tr\u1ee5c th\u1eddi gian, nh\u00f3m \u0111\u00e3 x\u00e1c \u0111\u1ecbnh r\u1eb1ng quy tr\u00ecnh l\u1ea5y m\u1eabu rung \u0111\u1ed9ng kh\u00f4ng c\u00f3 t\u00ednh ti\u1ec1n x\u1eed l\u00fd. N\u00f3 gi\u1eef b\u1ed9 x\u1eed l\u00fd cho \u0111\u1ebfn khi to\u00e0n b\u1ed9 b\u1ed9 \u0111\u1ec7m \u0111\u01b0\u1ee3c l\u1ea5p \u0111\u1ea7y, ng\u0103n ch\u1eb7n ng\u1eaft chuy\u1ec3n \u0111\u1ed9ng \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t ngay l\u1eadp t\u1ee9c. Bi\u1ec3u \u0111\u1ed3 cho th\u1ea5y m\u1ed9t kho\u1ea3ng tr\u1ed1ng r\u00f5 r\u00e0ng gi\u1eefa T\u00edn hi\u1ec7u nh\u1eadn \u0111\u01b0\u1ee3c<\/em> tr\u1ea1ng th\u00e1i v\u00e0 T\u00edn hi\u1ec7u \u0111\u00e3 x\u1eed l\u00fd<\/em> tr\u1ea1ng th\u00e1i \u0111\u1ed1i v\u1edbi c\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed9ng.<\/p>\n

          \ud83d\ude80 C\u00e1c chi\u1ebfn l\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a th\u00f4ng qua m\u00f4 h\u00ecnh h\u00f3a<\/h2>\n

          V\u1edbi c\u00e1c n\u00fat c\u1ed5 chai \u0111\u00e3 \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh, nh\u00f3m \u0111\u00e3 \u0111\u1ec1 xu\u1ea5t c\u00e1c thay \u0111\u1ed5i ki\u1ebfn tr\u00fac \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a tr\u1ef1c ti\u1ebfp trong bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML. M\u1ee5c ti\u00eau l\u00e0 gi\u1ea3m \u0111\u1ed9 tr\u1ec5 cho c\u00e1c s\u1ef1 ki\u1ec7n \u01b0u ti\u00ean cao v\u00e0 l\u00e0m m\u1ecbn \u0111\u1ed9 rung tr\u00ean to\u00e0n h\u1ec7 th\u1ed1ng.<\/p>\n

          Chi\u1ebfn l\u01b0\u1ee3c 1: Thu th\u1eadp d\u1eef li\u1ec7u d\u1ef1a tr\u00ean ng\u1eaft<\/h3>\n

          Thay v\u00ec li\u00ean t\u1ee5c ki\u1ec3m tra c\u1ea3m bi\u1ebfn rung, nh\u00f3m \u0111\u00e3 c\u1ea5u h\u00ecnh ph\u1ea7n c\u1ee9ng \u0111\u1ec3 t\u1ea1o ng\u1eaft theo t\u1ea7n s\u1ed1 l\u1ea5y m\u1eabu. Thay \u0111\u1ed5i n\u00e0y cho ph\u00e9p v\u00f2ng l\u1eb7p ch\u00ednh \u1edf tr\u1ea1ng th\u00e1i ch\u1edd cho \u0111\u1ebfn khi d\u1eef li\u1ec7u c\u00f3 s\u1eb5n.<\/p>\n

            \n
          • Tr\u01b0\u1edbc \u0111\u00e2y:<\/strong> CPU ch\u1ee7 \u0111\u1ed9ng ki\u1ec3m tra thanh ghi tr\u1ea1ng th\u00e1i trong m\u1ed7i chu k\u1ef3.<\/li>\n
          • Sau khi thay \u0111\u1ed5i:<\/strong> CPU ng\u1ee7 cho \u0111\u1ebfn khi ph\u1ea7n c\u1ee9ng k\u00edch ho\u1ea1t c\u1edd ng\u1eaft.<\/li>\n<\/ul>\n

            S\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3n \u00e1nh \u0111i\u1ec1u n\u00e0y b\u1eb1ng c\u00e1ch lo\u1ea1i b\u1ecf c\u00e1c l\u1ea7n l\u1eb7p l\u1ea1iKi\u1ec3m tra tr\u1ea1ng th\u00e1i<\/em>s\u1ef1 ki\u1ec7n v\u00e0 thay th\u1ebf ch\u00fang b\u1eb1ng m\u1ed9t s\u1ef1 ki\u1ec7n duy nh\u1ea5tK\u00edch ho\u1ea1t ng\u1eaft<\/em>s\u1ef1 ki\u1ec7n \u0111\u01b0\u1ee3c \u0111\u1ed3ng b\u1ed9 v\u1edbi \u0111\u1ed3ng h\u1ed3 c\u1ea3m bi\u1ebfn.<\/p>\n

            Chi\u1ebfn l\u01b0\u1ee3c 2: L\u1eadp l\u1ecbch d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean<\/h3>\n

            \u0110\u1ec3 gi\u1ea3i quy\u1ebft \u0111\u1ed9 tr\u1ec5 c\u1ee7a c\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed9ng, nh\u00f3m \u0111\u00e3 tri\u1ec3n khai h\u00e0ng \u0111\u1ee3i \u01b0u ti\u00ean cho c\u00e1c ng\u1eaft. T\u00edn hi\u1ec7u chuy\u1ec3n \u0111\u1ed9ng \u0111\u01b0\u1ee3c g\u00e1n m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean cao h\u01a1n so v\u1edbi thao t\u00e1c ghi d\u1eef li\u1ec7u rung.<\/p>\n

              \n
            • \u01afu ti\u00ean 1:<\/strong> Ph\u00e1t hi\u1ec7n chuy\u1ec3n \u0111\u1ed9ng (Ph\u1ea3n h\u1ed3i t\u1ee9c th\u00ec)<\/li>\n
            • \u01afu ti\u00ean 2:<\/strong> L\u01b0u tr\u1eef d\u1eef li\u1ec7u rung (N\u1ec1n)<\/li>\n
            • \u01afu ti\u00ean 3:<\/strong> Ghi nh\u1eadt k\u00fd nhi\u1ec7t \u0111\u1ed9 (\u01afu ti\u00ean th\u1ea5p)<\/li>\n<\/ul>\n

              S\u1ef1 \u0111i\u1ec1u ch\u1ec9nh n\u00e0y \u0111\u1ea3m b\u1ea3o r\u1eb1ng khi c\u1ea3m bi\u1ebfn chuy\u1ec3n \u0111\u1ed9ng k\u00edch ho\u1ea1t, tr\u00ecnh x\u1eed l\u00fd ng\u1eaft rung s\u1ebd t\u1ea1m d\u1eebng thao t\u00e1c ghi hi\u1ec7n t\u1ea1i v\u00e0 nh\u01b0\u1eddng quy\u1ec1n \u0111i\u1ec1u khi\u1ec3n ngay l\u1eadp t\u1ee9c. S\u01a1 \u0111\u1ed3 th\u1eddi gian cho th\u1ea5yX\u1eed l\u00fd chuy\u1ec3n \u0111\u1ed9ng<\/em>\u0111\u01b0\u1eddng \u0111\u1eddi ch\u1ed3ng ch\u00e9o l\u00eanL\u01b0u tr\u1eef rung<\/em>\u0111\u01b0\u1eddng \u0111\u1eddi, nh\u01b0ng nhi\u1ec7m v\u1ee5 chuy\u1ec3n \u0111\u1ed9ng ho\u00e0n th\u00e0nh tr\u01b0\u1edbc.<\/p>\n

              Chi\u1ebfn l\u01b0\u1ee3c 3: \u0110\u1ec7m k\u00e9p<\/h3>\n

              \u0110\u1ec3 ng\u0103n qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u l\u00e0m ch\u1eb7n vi\u1ec7c \u0111\u1ecdc c\u1ea3m bi\u1ebfn, h\u1ec7 th\u1ed1ng \u0111\u1ec7m k\u00e9p \u0111\u00e3 \u0111\u01b0\u1ee3c tri\u1ec3n khai. Trong khi m\u1ed9t b\u1ed9 \u0111\u1ec7m \u0111ang \u0111\u01b0\u1ee3c c\u1ea3m bi\u1ebfn n\u1ea1p d\u1eef li\u1ec7u, b\u1ed9 \u0111\u1ec7m c\u00f2n l\u1ea1i \u0111ang \u0111\u01b0\u1ee3c m\u00f4-\u0111un truy\u1ec1n d\u1eef li\u1ec7u \u0111\u1ecdc.<\/p>\n\n\n\n\n\n\n
              Tr\u1ea1ng th\u00e1i b\u1ed9 \u0111\u1ec7m<\/th>\nB\u1ed9 \u0111\u1ecdc<\/th>\nB\u1ed9 ghi<\/th>\n<\/tr>\n<\/thead>\n
              B\u1ed9 \u0111\u1ec7m A \u0111\u1ea7y<\/td>\nM\u00f4-\u0111un Truy\u1ec1n<\/td>\nC\u1ea3m bi\u1ebfn<\/td>\n<\/tr>\n
              B\u1ed9 \u0111\u1ec7m B \u0111\u1ea7y<\/td>\nC\u1ea3m bi\u1ebfn<\/td>\nM\u00f4-\u0111un Truy\u1ec1n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

              S\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u00e3 \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt \u0111\u1ec3 th\u1ec3 hi\u1ec7n vi\u1ec7c th\u1ef1c thi song song c\u1ee7a c\u00e1c \u0110\u1ecdc c\u1ea3m bi\u1ebfn<\/em> v\u00e0 G\u1eedi d\u1eef li\u1ec7u<\/em> \u0111\u01b0\u1eddng truy\u1ec1n. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 lo\u1ea1i b\u1ecf th\u1eddi gian ch\u1edd \u0111\u1ee3i tr\u01b0\u1edbc \u0111\u00f3 khi \u0111\u01b0\u1ee3c quan s\u00e1t th\u1ea5y khi bus truy\u1ec1n \u0111ang b\u1ecb chi\u1ebfm d\u1ee5ng.<\/p>\n

              \ud83d\udcc8 \u0110o l\u01b0\u1eddng c\u00e1c c\u1ea3i ti\u1ebfn hi\u1ec7u su\u1ea5t<\/h2>\n

              Sau khi th\u1ef1c hi\u1ec7n c\u00e1c thay \u0111\u1ed5i c\u00f3 ngu\u1ed3n g\u1ed1c t\u1eeb m\u00f4 h\u00ecnh th\u1eddi gian, h\u1ec7 th\u1ed1ng \u0111\u00e3 \u0111\u01b0\u1ee3c \u0111\u00e1nh gi\u00e1 l\u1ea1i d\u1ef1a tr\u00ean c\u00e1c ch\u1ec9 s\u1ed1 ban \u0111\u1ea7u. S\u01a1 \u0111\u1ed3 th\u1eddi gian UML m\u1edbi \u0111\u00e3 \u0111\u00f3ng vai tr\u00f2 l\u00e0 b\u1ea3n thi\u1ebft k\u1ebf cho tr\u1ea1ng th\u00e1i \u0111\u00e3 \u0111\u01b0\u1ee3c t\u1ed1i \u01b0u h\u00f3a.<\/p>\n

              C\u00e1c ch\u1ec9 s\u1ed1 so s\u00e1nh<\/h3>\n
                \n
              • \u0110\u1ed9 tr\u1ec5 trung b\u00ecnh:<\/strong> Gi\u1ea3m t\u1eeb 450\u03bcs xu\u1ed1ng c\u00f2n 120\u03bcs cho vi\u1ec7c ph\u00e1t hi\u1ec7n chuy\u1ec3n \u0111\u1ed9ng.<\/li>\n
              • \u0110\u1ed9 rung (Jitter):<\/strong> Ph\u01b0\u01a1ng sai gi\u1ea3m t\u1eeb 200\u03bcs xu\u1ed1ng c\u00f2n 20\u03bcs.<\/li>\n
              • T\u1ef7 l\u1ec7 s\u1eed d\u1ee5ng CPU:<\/strong> Gi\u1ea3m t\u1eeb 85% xu\u1ed1ng c\u00f2n 40% do ch\u1ebf \u0111\u1ed9 ng\u1ee7.<\/li>\n
              • Th\u00f4ng l\u01b0\u1ee3ng:<\/strong> T\u0103ng 15% do x\u1eed l\u00fd song song.<\/li>\n<\/ul>\n

                Vi\u1ec7c gi\u1ea3m t\u1ef7 l\u1ec7 s\u1eed d\u1ee5ng CPU l\u00e0 m\u1ed9t l\u1ee3i \u00edch ph\u1ee5. B\u1eb1ng c\u00e1ch cho ph\u00e9p b\u1ed9 vi x\u1eed l\u00fd ng\u1ee7 trong c\u00e1c kho\u1ea3ng tr\u1ed1ng c\u1ee7a c\u1ea3m bi\u1ebfn, m\u1ee9c ti\u00eau th\u1ee5 \u0111i\u1ec7n n\u0103ng \u0111\u00e3 gi\u1ea3m \u0111\u00e1ng k\u1ec3. \u0110i\u1ec1u n\u00e0y \u0111\u00e3 k\u00e9o d\u00e0i tu\u1ed5i th\u1ecd pin c\u1ee7a \u0111\u01a1n v\u1ecb c\u1ed5ng, m\u1ed9t y\u1ebfu t\u1ed1 then ch\u1ed1t \u0111\u1ed1i v\u1edbi vi\u1ec7c tri\u1ec3n khai t\u1eeb xa.<\/p>\n

                X\u00e1c th\u1ef1c qua s\u01a1 \u0111\u1ed3 th\u1eddi gian<\/h3>\n

                S\u01a1 \u0111\u1ed3 th\u1eddi gian UML cu\u1ed1i c\u00f9ng \u0111\u00e3 \u0111\u00f3ng vai tr\u00f2 nh\u01b0 m\u1ed9t t\u00e0i li\u1ec7u x\u00e1c th\u1ef1c. N\u00f3 ch\u1ee9ng minh r\u1eb1ng ki\u1ebfn tr\u00fac m\u1edbi \u0111\u00e1p \u1ee9ng t\u1ea5t c\u1ea3 c\u00e1c y\u00eau c\u1ea7u v\u1ec1 th\u1eddi h\u1ea1n. M\u1ecdi s\u1ef1 ki\u1ec7n tr\u01b0\u1edbc \u0111\u00e2y hi\u1ec3n th\u1ecb c\u1ea3nh b\u00e1o m\u00e0u \u0111\u1ecf (qu\u00e1 h\u1ea1n) nay \u0111\u1ec1u n\u1eb1m trong v\u00f9ng ch\u1ea5p nh\u1eadn m\u00e0u xanh l\u00e1. S\u1ef1 x\u00e1c nh\u1eadn tr\u1ef1c quan \u0111\u00e3 mang l\u1ea1i s\u1ef1 tin c\u1eady cho c\u00e1c b\u00ean li\u00ean quan v\u1ec1 \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

                \ud83d\udee1\ufe0f C\u00e1c ph\u01b0\u01a1ng ph\u00e1p t\u1ed1t nh\u1ea5t cho ph\u00e2n t\u00edch th\u1eddi gian<\/h2>\n

                Vi\u1ec7c tri\u1ec3n khai th\u00e0nh c\u00f4ng c\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u00f2i h\u1ecfi s\u1ef1 k\u1ef7 lu\u1eadt v\u00e0 tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n m\u00f4 h\u00ecnh c\u1ee5 th\u1ec3. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p sau \u0111\u00e2y \u0111\u1ea3m b\u1ea3o c\u00e1c s\u01a1 \u0111\u1ed3 v\u1eabn ch\u00ednh x\u00e1c v\u00e0 h\u1eefu \u00edch trong su\u1ed1t v\u00f2ng \u0111\u1eddi ph\u00e1t tri\u1ec3n.<\/p>\n

                1. T\u00ednh nh\u1ea5t qu\u00e1n v\u1ec1 \u0111\u1ed9 chi ti\u1ebft<\/h3>\n

                \u0110\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c \u0111\u01a1n v\u1ecb th\u1eddi gian \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong s\u01a1 \u0111\u1ed3 l\u00e0 nh\u1ea5t qu\u00e1n. Vi\u1ec7c tr\u1ed9n l\u1eabn mili gi\u00e2y v\u00e0 micro gi\u00e2y tr\u00ean c\u00f9ng m\u1ed9t tr\u1ee5c c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec3u nh\u1ea7m. H\u00e3y x\u00e1c \u0111\u1ecbnh m\u1ed9t \u0111\u01a1n v\u1ecb th\u1eddi gian c\u01a1 s\u1edf cho to\u00e0n b\u1ed9 m\u00f4 h\u00ecnh.<\/p>\n

                2. Chuy\u1ec3n tr\u1ea1ng th\u00e1i r\u00f5 r\u00e0ng<\/h3>\n

                \u0110\u1eebng gi\u1ea3 \u0111\u1ecbnh r\u1eb1ng c\u00e1c tr\u1ea1ng th\u00e1i \u0111\u00e3 \u0111\u01b0\u1ee3c bi\u1ebft. H\u00e3y \u0111\u00e1nh d\u1ea5u r\u00f5 r\u00e0ng c\u00e1c chuy\u1ec3n tr\u1ea1ng th\u00e1i nh\u01b0 Ch\u1edd<\/em>, Th\u1ef1c thi<\/em>, v\u00e0 Ho\u00e0n th\u00e0nh<\/em>. S\u1ef1 kh\u00f4ng r\u00f5 r\u00e0ng trong c\u00e1c thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i d\u1eabn \u0111\u1ebfn c\u00e1c ph\u00e9p t\u00ednh th\u1eddi gian kh\u00f4ng ch\u00ednh x\u00e1c.<\/p>\n

                3. Bao g\u1ed3m x\u1eed l\u00fd l\u1ed7i<\/h3>\n

                M\u00f4 h\u00ecnh h\u00f3a th\u1eddi gian c\u1ee7a c\u00e1c \u0111\u01b0\u1eddng d\u1eabn kh\u00f4i ph\u1ee5c l\u1ed7i. N\u1ebfu c\u1ea3m bi\u1ebfn kh\u00f4ng ph\u1ea3n h\u1ed3i, h\u1ec7 th\u1ed1ng s\u1ebd ch\u1edd bao l\u00e2u tr\u01b0\u1edbc khi h\u1ebft th\u1eddi gian ch\u1edd? Gi\u00e1 tr\u1ecb th\u1eddi gian ch\u1edd n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng tr\u00ean bi\u1ec3u \u0111\u1ed3.<\/p>\n

                4. C\u1eadp nh\u1eadt theo th\u1ef1c t\u1ebf<\/h3>\n

                Bi\u1ec3u \u0111\u1ed3 th\u1eddi gian ch\u1ec9 h\u1ee3p l\u1ec7 khi n\u00f3 kh\u1edbp v\u1edbi h\u00e0nh vi th\u1ef1c t\u1ebf c\u1ee7a m\u00e3. N\u1ebfu vi\u1ec7c tri\u1ec3n khai thay \u0111\u1ed5i \u0111\u1ed9 \u01b0u ti\u00ean ng\u1eaft, bi\u1ec3u \u0111\u1ed3 ph\u1ea3i \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt ngay l\u1eadp t\u1ee9c. C\u00e1c bi\u1ec3u \u0111\u1ed3 l\u1ed7i th\u1eddi t\u1ea1o ra s\u1ef1 t\u1ef1 tin sai l\u1ea7m.<\/p>\n

                \u26a0\ufe0f Nh\u1eefng c\u00e1i b\u1eaby ph\u1ed5 bi\u1ebfn c\u1ea7n tr\u00e1nh<\/h2>\n

                Ngay c\u1ea3 c\u00e1c k\u1ef9 s\u01b0 c\u00f3 kinh nghi\u1ec7m c\u0169ng c\u00f3 th\u1ec3 m\u1eafc b\u1eaby khi s\u1eed d\u1ee5ng bi\u1ec3u \u0111\u1ed3 th\u1eddi gian. Nh\u1eadn th\u1ee9c v\u1ec1 nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn n\u00e0y gi\u00fap duy tr\u00ec t\u00ednh to\u00e0n v\u1eb9n c\u1ee7a ph\u00e2n t\u00edch.<\/p>\n

                  \n
                • B\u1ecf qua \u0111\u1ed9 rung (jitter):<\/strong>Ch\u1ec9 t\u1eadp trung v\u00e0o \u0111\u1ed9 tr\u1ec5 trung b\u00ecnh c\u00f3 th\u1ec3 che gi\u1ea5u c\u00e1c k\u1ecbch b\u1ea3n x\u1ea5u nh\u1ea5t. Lu\u00f4n m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ed9 bi\u1ebfn thi\u00ean t\u1ed1i \u0111a.<\/li>\n
                • \u0110\u01a1n gi\u1ea3n h\u00f3a qu\u00e1 m\u1ee9c:<\/strong>Vi\u1ec7c k\u1ebft h\u1ee3p c\u00e1c \u0111\u01b0\u1eddng \u0111\u1eddi (lifelines) \u0111\u1ea1i di\u1ec7n cho c\u00e1c th\u00e0nh ph\u1ea7n ph\u1ea7n c\u1ee9ng kh\u00e1c nhau c\u00f3 th\u1ec3 l\u00e0m m\u1edd \u0111i c\u00e1c v\u1ea5n \u0111\u1ec1 tranh ch\u1ea5p. H\u00e3y gi\u1eef ri\u00eang bi\u1ec7t c\u00e1c l\u1edbp ph\u1ea7n c\u1ee9ng v\u00e0 ph\u1ea7n m\u1ec1m.<\/li>\n
                • B\u1ecf qua \u0111\u1ed9 tr\u1ec5 ng\u1eaft:<\/strong>Th\u1eddi gian CPU c\u1ea7n \u0111\u1ec3 chuy\u1ec3n ng\u1eef c\u1ea3nh th\u01b0\u1eddng kh\u00f4ng b\u1eb1ng kh\u00f4ng. H\u00e3y bao g\u1ed3m chi ph\u00ed n\u00e0y trong bi\u1ec3u \u0111\u1ed3.<\/li>\n
                • M\u00f4 h\u00ecnh h\u00f3a t\u0129nh:<\/strong>S\u1eed d\u1ee5ng m\u1ed9t bi\u1ec3u \u0111\u1ed3 duy nh\u1ea5t cho t\u1ea5t c\u1ea3 c\u00e1c k\u1ecbch b\u1ea3n. C\u00e1c \u0111i\u1ec1u ki\u1ec7n t\u1ea3i kh\u00e1c nhau (v\u00ed d\u1ee5: l\u01b0u l\u01b0\u1ee3ng cao so v\u1edbi nh\u00e0n r\u1ed7i) c\u00f3 th\u1ec3 y\u00eau c\u1ea7u c\u00e1c m\u00f4 h\u00ecnh th\u1eddi gian ri\u00eang bi\u1ec7t.<\/li>\n<\/ul>\n

                  \ud83d\udd17 T\u00edch h\u1ee3p v\u1edbi c\u00e1c m\u00f4 h\u00ecnh kh\u00e1c<\/h2>\n

                  M\u1eb7c d\u00f9 bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML r\u1ea5t m\u1ea1nh m\u1ebd, n\u00f3 hi\u1ec7u qu\u1ea3 nh\u1ea5t khi \u0111\u01b0\u1ee3c t\u00edch h\u1ee3p v\u1edbi c\u00e1c k\u1ef9 thu\u1eadt m\u00f4 h\u00ecnh h\u00f3a kh\u00e1c. N\u00f3 kh\u00f4ng n\u00ean t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch bi\u1ec7t l\u1eadp.<\/p>\n

                  T\u01b0\u01a1ng t\u00e1c v\u1edbi bi\u1ec3u \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i<\/h3>\n

                  S\u1eed d\u1ee5ng bi\u1ec3u \u0111\u1ed3 m\u00e1y tr\u1ea1ng th\u00e1i \u0111\u1ec3 \u0111\u1ecbnh ngh\u0129a logic b\u00ean trong m\u1ed9t \u0111\u01b0\u1eddng \u0111\u1eddi. Bi\u1ec3u \u0111\u1ed3 th\u1eddi gian sau \u0111\u00f3 quy \u0111\u1ecbnh th\u1eddi gian c\u1ea7n thi\u1ebft cho c\u00e1c chuy\u1ec3n \u0111\u1ed5i. S\u1ef1 k\u1ebft h\u1ee3p n\u00e0y l\u00e0m r\u00f5 c\u1ea3 lu\u1ed3ng logic v\u00e0 c\u00e1c r\u00e0ng bu\u1ed9c th\u1eddi gian.<\/p>\n

                  T\u01b0\u01a1ng t\u00e1c v\u1edbi bi\u1ec3u \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng<\/h3>\n

                  Bi\u1ec3u \u0111\u1ed3 ho\u1ea1t \u0111\u1ed9ng th\u1ec3 hi\u1ec7n lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n. Bi\u1ec3u \u0111\u1ed3 th\u1eddi gian th\u1ec3 hi\u1ec7n lu\u1ed3ng th\u1eddi gian. Vi\u1ec7c s\u1eed d\u1ee5ng ch\u00fang c\u00f9ng nhau cho ph\u00e9p c\u00e1c nh\u00f3m xem x\u00e9t li\u1ec7u lu\u1ed3ng logic c\u00f3 hi\u1ec7u qu\u1ea3 trong c\u00e1c r\u00e0ng bu\u1ed9c th\u1eddi gian \u0111\u00e3 cho hay kh\u00f4ng.<\/p>\n

                  \ud83c\udfaf K\u1ebft lu\u1eadn<\/h2>\n

                  T\u1ed1i \u01b0u h\u00f3a lu\u1ed3ng x\u1eed l\u00fd d\u1eef li\u1ec7u c\u1ea3m bi\u1ebfn \u0111\u00f2i h\u1ecfi s\u1ef1 hi\u1ec3u bi\u1ebft s\u00e2u s\u1eafc v\u1ec1 \u0111\u1ed9ng l\u1ef1c h\u1ecdc th\u1eddi gian. C\u00e1c m\u00f4 h\u00ecnh lu\u1ed3ng d\u1eef li\u1ec7u ti\u00eau chu\u1ea9n th\u01b0\u1eddng b\u1ecf qua kh\u00eda c\u1ea1nh th\u1eddi gian quan tr\u1ecdng n\u00e0y. B\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng bi\u1ec3u \u0111\u1ed3 th\u1eddi gian UML, c\u00e1c nh\u00f3m k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 tr\u1ef1c quan h\u00f3a r\u00f5 r\u00e0ng \u0111\u1ed9 tr\u1ec5, \u0111\u1ed9 rung v\u00e0 s\u1ef1 tranh ch\u1ea5p t\u00e0i nguy\u00ean.<\/p>\n

                  Nghi\u00ean c\u1ee9u \u0111i\u1ec3n h\u00ecnh \u0111\u00e3 ch\u1ee9ng minh r\u1eb1ng vi\u1ec7c chuy\u1ec3n \u0111\u1ed5i t\u1eeb ki\u1ebfn tr\u00fac th\u0103m d\u00f2 sang h\u1ec7 th\u1ed1ng d\u1ef1a tr\u00ean ng\u1eaft v\u00e0 \u01b0u ti\u00ean \u0111\u00e3 c\u1ea3i thi\u1ec7n \u0111\u00e1ng k\u1ec3 hi\u1ec7u su\u1ea5t. Bi\u1ec3u \u0111\u1ed3 th\u1eddi gian kh\u00f4ng ch\u1ec9 \u0111\u00f3ng vai tr\u00f2 l\u00e0 t\u00e0i li\u1ec7u, m\u00e0 c\u00f2n l\u00e0 c\u00f4ng c\u1ee5 thi\u1ebft k\u1ebf h\u01b0\u1edbng d\u1eabn qu\u00e1 tr\u00ecnh t\u1ed1i \u01b0u h\u00f3a. N\u00f3 cho ph\u00e9p nh\u00f3m d\u1ef1 \u0111o\u00e1n c\u00e1c n\u00fat c\u1ed5 chai tr\u01b0\u1edbc khi vi\u1ebft m\u00e3 v\u00e0 x\u00e1c minh c\u00e1c gi\u1ea3i ph\u00e1p sau khi tri\u1ec3n khai.<\/p>\n

                  \u0110\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng m\u00e0 th\u1eddi gian l\u00e0 m\u1ed9t r\u00e0ng bu\u1ed9c v\u1ec1 an to\u00e0n ho\u1eb7c hi\u1ec7u su\u1ea5t, ph\u01b0\u01a1ng ph\u00e1p m\u00f4 h\u00ecnh h\u00f3a n\u00e0y l\u00e0 kh\u00f4ng th\u1ec3 thi\u1ebfu. N\u00f3 bi\u1ebfn c\u00e1c y\u00eau c\u1ea7u th\u1eddi gian tr\u1eebu t\u01b0\u1ee3ng th\u00e0nh b\u1eb1ng ch\u1ee9ng tr\u1ef1c quan c\u1ee5 th\u1ec3, cho ph\u00e9p c\u00e1c quy\u1ebft \u0111\u1ecbnh k\u1ef9 thu\u1eadt ch\u00ednh x\u00e1c. Khi c\u00e1c m\u1ea1ng c\u1ea3m bi\u1ebfn tr\u1edf n\u00ean ph\u1ee9c t\u1ea1p h\u01a1n v\u00e0 c\u00e1c y\u00eau c\u1ea7u th\u1eddi gian th\u1ef1c kh\u1eaft khe h\u01a1n, kh\u1ea3 n\u0103ng m\u00f4 h\u00ecnh h\u00f3a th\u1eddi gian ch\u00ednh x\u00e1c s\u1ebd v\u1eabn l\u00e0 m\u1ed9t n\u0103ng l\u1ef1c c\u1ed1t l\u00f5i c\u1ee7a c\u00e1c ki\u1ebfn tr\u00fac s\u01b0 h\u1ec7 th\u1ed1ng.<\/p>\n

                  B\u1eb1ng c\u00e1ch tu\u00e2n th\u1ee7 c\u00e1c th\u1ef1c ti\u1ec5n t\u1ed1t nh\u1ea5t \u0111\u01b0\u1ee3c n\u00eau ra v\u00e0 tr\u00e1nh nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn, c\u00e1c t\u1ed5 ch\u1ee9c c\u00f3 th\u1ec3 t\u1eadn d\u1ee5ng s\u01a1 \u0111\u1ed3 th\u1eddi gian UML \u0111\u1ec3 x\u00e2y d\u1ef1ng c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang m\u1ea1nh m\u1ebd, hi\u1ec7u qu\u1ea3 v\u00e0 \u0111\u00e1ng tin c\u1eady. Vi\u1ec7c \u0111\u1ea7u t\u01b0 v\u00e0o m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c s\u1ebd mang l\u1ea1i l\u1ee3i \u00edch trong vi\u1ec7c gi\u1ea3m th\u1eddi gian g\u1ee1 l\u1ed7i, gi\u1ea3m chi ph\u00ed ph\u1ea7n c\u1ee9ng v\u00e0 t\u0103ng \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n","protected":false},"excerpt":{"rendered":"

                  Trong l\u0129nh v\u1ef1c h\u1ec7 th\u1ed1ng nh\u00fang v\u00e0 \u0111i\u1ec7n to\u00e1n th\u1eddi gian th\u1ef1c, \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 th\u1eddi gian kh\u00f4ng ch\u1ec9 l\u00e0 m\u1ed9t l\u1ef1a ch\u1ecdn m\u00e0 l\u00e0 m\u1ed9t y\u00eau c\u1ea7u b\u1eaft…<\/p>\n","protected":false},"author":1,"featured_media":893,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"T\u1ed1i \u01b0u h\u00f3a lu\u1ed3ng d\u1eef li\u1ec7u c\u1ea3m bi\u1ebfn b\u1eb1ng s\u01a1 \u0111\u1ed3 th\u1eddi gian UML \u23f1\ufe0f","_yoast_wpseo_metadesc":"T\u00ecm hi\u1ec3u c\u00e1ch s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 th\u1eddi gian UML \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a x\u1eed l\u00fd d\u1eef li\u1ec7u c\u1ea3m bi\u1ebfn. 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