{"id":558,"date":"2026-04-05T14:55:24","date_gmt":"2026-04-05T14:55:24","guid":{"rendered":"https:\/\/www.viz-tools.com\/vi\/uml-timing-vs-sequence-diagrams-performance-analysis\/"},"modified":"2026-04-05T14:55:24","modified_gmt":"2026-04-05T14:55:24","slug":"uml-timing-vs-sequence-diagrams-performance-analysis","status":"publish","type":"post","link":"https:\/\/www.viz-tools.com\/vi\/uml-timing-vs-sequence-diagrams-performance-analysis\/","title":{"rendered":"So s\u00e1nh s\u01a1 \u0111\u1ed3 Th\u1eddi gian UML: Khi n\u00e0o n\u00ean chuy\u1ec3n t\u1eeb S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 sang S\u01a1 \u0111\u1ed3 Th\u1eddi gian \u0111\u1ec3 ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t"},"content":{"rendered":"

Thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u su\u1ea5t cao \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00ednh x\u00e1c. Khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u01b0\u01a1ng t\u00e1c trong c\u00e1c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m ph\u1ee9c t\u1ea1p, vi\u1ec7c l\u1ef1a ch\u1ecdn lo\u1ea1i s\u01a1 \u0111\u1ed3 s\u1ebd quy\u1ebft \u0111\u1ecbnh m\u1ee9c \u0111\u1ed9 r\u00f5 r\u00e0ng c\u1ee7a ph\u00e2n t\u00edch. Quy\u1ebft \u0111\u1ecbnh th\u01b0\u1eddng n\u1eb1m gi\u1eefa S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 UML v\u00e0 S\u01a1 \u0111\u1ed3 Th\u1eddi gian UML. Trong khi S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 xu\u1ea5t s\u1eafc trong vi\u1ec7c minh h\u1ecda lu\u1ed3ng logic, th\u00ec S\u01a1 \u0111\u1ed3 Th\u1eddi gian cung c\u1ea5p ki\u1ec3m so\u00e1t chi ti\u1ebft v\u1ec1 c\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 th\u1eddi gian. Hi\u1ec3u r\u00f5 s\u1ef1 kh\u00e1c bi\u1ec7t n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft \u0111\u1ed1i v\u1edbi c\u00e1c k\u1ef9 s\u01b0 ch\u1ecbu tr\u00e1ch nhi\u1ec7m t\u1ed1i \u01b0u \u0111\u1ed9 tr\u1ec5, x\u00e1c minh h\u1ec7 th\u1ed1ng th\u1eddi gian th\u1ef1c v\u00e0 qu\u1ea3n l\u00fd t\u00ednh \u0111\u1ed3ng th\u1eddi.<\/p>\n

H\u01b0\u1edbng d\u1eabn n\u00e0y kh\u00e1m ph\u00e1 c\u00e1c chi ti\u1ebft k\u1ef9 thu\u1eadt khi chuy\u1ec3n t\u1eeb m\u00f4 h\u00ecnh Th\u1ee9 t\u1ef1 sang m\u00f4 h\u00ecnh Th\u1eddi gian. N\u00f3 n\u00eau r\u00f5 khi \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 th\u1eddi gian v\u01b0\u1ee3t tr\u1ed9i h\u01a1n so v\u1edbi logic t\u01b0\u01a1ng t\u00e1c, v\u00e0 c\u00e1ch m\u00f4 h\u00ecnh h\u00f3a c\u00e1c ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 m\u00e0 kh\u00f4ng c\u1ea7n ph\u1ee5 thu\u1ed9c v\u00e0o c\u00f4ng c\u1ee5 chuy\u00ean d\u1ee5ng. Ch\u00fang ta s\u1ebd xem x\u00e9t s\u1ef1 kh\u00e1c bi\u1ec7t v\u1ec1 c\u1ea5u tr\u00fac, c\u00e1c tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng c\u1ee5 th\u1ec3, v\u00e0 h\u1ec7 qu\u1ea3 m\u00f4 h\u00ecnh h\u00f3a \u0111\u1ed1i v\u1edbi \u0111\u1ed9 tin c\u1eady c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

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\"Hand-drawn<\/figure>\n<\/div>\n

Hi\u1ec3u r\u00f5 S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 trong b\u1ed1i c\u1ea3nh hi\u1ec7u su\u1ea5t \u23f1\ufe0f<\/h2>\n

S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 l\u00e0 ti\u00eau chu\u1ea9n ng\u00e0nh \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u01b0\u01a1ng t\u00e1c gi\u1eefa c\u00e1c \u0111\u1ed1i t\u01b0\u1ee3ng theo th\u1eddi gian. Ch\u00fang t\u1eadp trung v\u00e0o th\u1ee9 t\u1ef1 c\u00e1c tin nh\u1eafn \u0111\u01b0\u1ee3c truy\u1ec1n gi\u1eefa c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng. Trong m\u1ed9t bu\u1ed5i \u0111\u00e1nh gi\u00e1 hi\u1ec7u su\u1ea5t th\u00f4ng th\u01b0\u1eddng, c\u00e1c k\u1ef9 s\u01b0 s\u1eed d\u1ee5ng c\u00e1c s\u01a1 \u0111\u1ed3 n\u00e0y \u0111\u1ec3 theo d\u00f5i h\u00e0nh tr\u00ecnh c\u1ee7a m\u1ed9t y\u00eau c\u1ea7u qua h\u1ec7 th\u1ed1ng.<\/p>\n

\u01afu \u0111i\u1ec3m c\u1ee7a m\u00f4 h\u00ecnh Th\u1ee9 t\u1ef1<\/h3>\n
    \n
  • R\u00f5 r\u00e0ng v\u1ec1 lu\u1ed3ng logic:<\/strong> Ch\u00fang hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng th\u00e0nh ph\u1ea7n n\u00e0o g\u1ecdi th\u00e0nh ph\u1ea7n n\u00e0o, gi\u00fap lu\u1ed3ng \u0111i\u1ec1u khi\u1ec3n d\u1ec5 hi\u1ec3u h\u01a1n.<\/li>\n
  • Lo\u1ea1i tin nh\u1eafn:<\/strong> Ch\u00fang ph\u00e2n bi\u1ec7t r\u00f5 r\u00e0ng gi\u1eefa c\u00e1c cu\u1ed9c g\u1ecdi \u0111\u1ed3ng b\u1ed9, t\u00edn hi\u1ec7u b\u1ea5t \u0111\u1ed3ng b\u1ed9 v\u00e0 c\u00e1c tin nh\u1eafn tr\u1ea3 v\u1ec1 b\u1eb1ng h\u00ecnh \u1ea3nh tr\u1ef1c quan.<\/li>\n
  • C\u00e1c m\u1ea3nh t\u01b0\u01a1ng t\u00e1c:<\/strong> Ch\u00fang h\u1ed7 tr\u1ee3 alt<\/code>, opt<\/code>, v\u00e0 loop<\/code> c\u00e1c m\u1ea3nh \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a logic \u0111i\u1ec1u ki\u1ec7n v\u00e0 l\u1eb7p l\u1ea1i.<\/li>\n
  • Bi\u1ec3u di\u1ec5n ng\u01b0\u1eddi d\u00f9ng\/\u0111\u1ed1i t\u01b0\u1ee3ng:<\/strong> Ch\u00fang r\u1ea5t t\u1ed1t \u0111\u1ec3 th\u1ec3 hi\u1ec7n c\u00e1c s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t t\u1eeb ng\u01b0\u1eddi d\u00f9ng ho\u1eb7c h\u1ec7 th\u1ed1ng b\u00ean ngo\u00e0i, kh\u1edfi \u0111\u1ed9ng c\u00e1c quy tr\u00ecnh.<\/li>\n<\/ul>\n

    H\u1ea1n ch\u1ebf khi ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t<\/h3>\n

    M\u1eb7c d\u00f9 ph\u1ed5 bi\u1ebfn, S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf b\u1ea9m sinh khi \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t nghi\u00eam ng\u1eb7t. Tr\u1ee5c th\u1eddi gian trong S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 l\u00e0 t\u01b0\u01a1ng \u0111\u1ed1i, kh\u00f4ng ph\u1ea3i tuy\u1ec7t \u0111\u1ed1i. N\u00f3 ng\u1ee5 \u00fd th\u1ee9 t\u1ef1 nh\u01b0ng kh\u00f4ng \u0111o l\u01b0\u1eddng ch\u00ednh x\u00e1c th\u1eddi l\u01b0\u1ee3ng.<\/p>\n

      \n
    • Thi\u1ebfu thang \u0111o th\u1eddi gian:<\/strong> Kh\u00f4ng c\u00f3 tr\u1ee5c th\u1eddi gian ngang. Kho\u1ea3ng c\u00e1ch gi\u1eefa c\u00e1c tin nh\u1eafn l\u00e0 t\u00f9y \u00fd v\u00e0 kh\u00f4ng \u0111\u1ea1i di\u1ec7n cho mili gi\u00e2y hay gi\u00e2y.<\/li>\n
    • \u0110\u1ed9 tr\u1ec5 \u1ea9n:<\/strong> M\u1eb7c d\u00f9 c\u00e1c thanh k\u00edch ho\u1ea1t th\u1ec3 hi\u1ec7n th\u1eddi gian, ch\u00fang kh\u00f4ng d\u1ec5 d\u00e0ng h\u1ed7 tr\u1ee3 c\u00e1c s\u1ef1 ki\u1ec7n ch\u1ed3ng ch\u00e9o tr\u00ean c\u00f9ng m\u1ed9t \u0111\u01b0\u1eddng s\u1ed1ng tr\u1eeb khi s\u01a1 \u0111\u1ed3 tr\u1edf n\u00ean r\u1ed1i r\u1eafm.<\/li>\n
    • Kh\u00f4ng nh\u1eadn di\u1ec7n \u0111\u01b0\u1ee3c t\u00ednh \u0111\u1ed3ng th\u1eddi:<\/strong> M\u00f4 h\u00ecnh h\u00f3a c\u00e1c \u0111\u01b0\u1eddng th\u1ef1c thi song song l\u00e0 kh\u00f3 kh\u0103n. C\u00e1c ho\u1ea1t \u0111\u1ed9ng ch\u1ed3ng ch\u00e9o c\u00f3 th\u1ec3 ng\u1ee5 \u00fd t\u00ednh \u0111\u1ed3ng th\u1eddi, nh\u01b0ng m\u1ed1i quan h\u1ec7 th\u1eddi gian ch\u00ednh x\u00e1c l\u00e0 kh\u00f3 x\u00e1c \u0111\u1ecbnh.<\/li>\n
    • \u0110\u1ed9 ph\u1ee9c t\u1ea1p c\u1ee7a r\u00e0ng bu\u1ed9c:<\/strong> Vi\u1ec7c th\u00eam c\u00e1c r\u00e0ng bu\u1ed9c v\u1ec1 th\u1eddi gian (v\u00ed d\u1ee5: \u201cph\u1ea3n h\u1ed3i ph\u1ea3i d\u01b0\u1edbi 50ms\u201d) y\u00eau c\u1ea7u ghi ch\u00fa v\u0103n b\u1ea3n, th\u01b0\u1eddng b\u1ecb b\u1ecf qua trong qu\u00e1 tr\u00ecnh xem x\u00e9t tr\u1ef1c quan.<\/li>\n<\/ul>\n

      Khi c\u00e1c y\u00eau c\u1ea7u v\u1ec1 hi\u1ec7u su\u1ea5t tr\u1edf n\u00ean nghi\u00eam ng\u1eb7t, ch\u1eb3ng h\u1ea1n nh\u01b0 trong c\u00e1c h\u1ec7 th\u1ed1ng nh\u00fang ho\u1eb7c c\u00e1c n\u1ec1n t\u1ea3ng giao d\u1ecbch t\u1ea7n su\u1ea5t cao, s\u1ef1 m\u01a1 h\u1ed3 c\u1ee7a s\u01a1 \u0111\u1ed3 Chu\u1ed7i tr\u1edf th\u00e0nh m\u1ed9t r\u1ee7i ro. C\u00e1c k\u1ef9 s\u01b0 c\u1ea7n bi\u1ebft kh\u00f4ng ch\u1ec9 \u0111i\u1ec1u g\u00ec x\u1ea3y ra, m\u00e0 c\u00f2n ch\u00ednh x\u00e1c khi n\u00e0o n\u00f3 x\u1ea3y ra so v\u1edbi \u0111\u1ed3ng h\u1ed3.<\/p>\n

      L\u00fd do \u1ee7ng h\u1ed9 s\u01a1 \u0111\u1ed3 Th\u1eddi gian \ud83d\udcca<\/h2>\n

      S\u01a1 \u0111\u1ed3 Th\u1eddi gian UML cung c\u1ea5p m\u1ed9t g\u00f3c nh\u00ecn chuy\u00ean bi\u1ec7t n\u01a1i tr\u1ee5c ngang \u0111\u1ea1i di\u1ec7n cho th\u1eddi gian. S\u1ef1 chuy\u1ec3n d\u1ecbch t\u1eeb th\u1ee9 t\u1ef1 t\u01b0\u01a1ng t\u00e1c sang ti\u1ebfn tr\u00ecnh theo th\u1eddi gian cho ph\u00e9p m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c c\u00e1c thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i v\u00e0 c\u00e1c m\u1ed1c th\u1eddi gian.<\/p>\n

      Kh\u1ea3 n\u0103ng c\u1ed1t l\u00f5i cho hi\u1ec7u su\u1ea5t<\/h3>\n
        \n
      • Tr\u1ee5c th\u1eddi gian tuy\u1ebfn t\u00ednh:<\/strong> M\u1ed9t thang \u0111o \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh (v\u00ed d\u1ee5: vi gi\u00e2y, mili gi\u00e2y) cho ph\u00e9p \u0111o tr\u1ef1c ti\u1ebfp c\u00e1c kho\u1ea3ng th\u1eddi gian.<\/li>\n
      • Bi\u1ebfn tr\u1ea1ng th\u00e1i:<\/strong> C\u00e1c s\u01a1 \u0111\u1ed3 c\u00f3 th\u1ec3 theo d\u00f5i tr\u1ea1ng th\u00e1i c\u1ee7a c\u00e1c bi\u1ebfn c\u1ee5 th\u1ec3 (v\u00ed d\u1ee5: `cpu_load`, `queue_depth`) theo th\u1eddi gian, ch\u1ee9 kh\u00f4ng ch\u1ec9 k\u00edch ho\u1ea1t \u0111\u1ed1i t\u01b0\u1ee3ng.<\/li>\n
      • R\u00e0ng bu\u1ed9c Th\u1eddi gian:<\/strong> C\u00e1c ch\u00fa th\u00edch r\u00f5 r\u00e0ng x\u00e1c \u0111\u1ecbnh th\u1eddi l\u01b0\u1ee3ng t\u1ed1i thi\u1ec3u, t\u1ed1i \u0111a v\u00e0 ch\u00ednh x\u00e1c cho c\u00e1c chuy\u1ec3n ti\u1ebfp.<\/li>\n
      • T\u00ednh song song:<\/strong> Nhi\u1ec1u thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c tr\u1ef1c quan h\u00f3a \u0111\u1ed3ng th\u1eddi tr\u00ean c\u00e1c \u0111\u01b0\u1eddng \u0111\u1eddi kh\u00e1c nhau, l\u00e0m cho t\u00ednh \u0111\u1ed3ng th\u1eddi tr\u1edf n\u00ean r\u00f5 r\u00e0ng.<\/li>\n<\/ul>\n

        Tr\u1ef1c quan h\u00f3a H\u00e0nh vi Th\u1eddi gian th\u1ef1c<\/h3>\n

        C\u00e1c h\u1ec7 th\u1ed1ng th\u1eddi gian th\u1ef1c th\u01b0\u1eddng ho\u1ea1t \u0111\u1ed9ng d\u01b0\u1edbi c\u00e1c m\u1ed1c th\u1eddi gian c\u1ee9ng ho\u1eb7c m\u1ec1m. S\u01a1 \u0111\u1ed3 Th\u1eddi gian cho ph\u00e9p c\u00e1c k\u1ef9 s\u01b0 \u00e1nh x\u1ea1 c\u00e1c m\u1ed1c th\u1eddi gian n\u00e0y tr\u1ef1c ti\u1ebfp l\u00ean timeline th\u1ef1c thi. N\u1ebfu m\u1ed9t t\u00e1c v\u1ee5 ph\u1ea3i ho\u00e0n th\u00e0nh trong v\u00f2ng 10ms, s\u01a1 \u0111\u1ed3 c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb th\u1eddi \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u, th\u1eddi l\u01b0\u1ee3ng c\u1ee7a t\u00e1c v\u1ee5 v\u00e0 d\u1ea5u m\u1ed1c th\u1eddi gian k\u1ebft th\u00fac.<\/p>\n

        Vi\u1ec7c tr\u1ef1c quan h\u00f3a n\u00e0y gi\u00fap ph\u00e1t hi\u1ec7n c\u00e1c \u0111i\u1ec3m ngh\u1ebdn m\u00e0 s\u01a1 \u0111\u1ed3 Chu\u1ed7i c\u00f3 th\u1ec3 che gi\u1ea5u. V\u00ed d\u1ee5, m\u1ed9t chu\u1ed7i ba l\u1eddi g\u1ecdi c\u00f3 th\u1ec3 tr\u00f4ng tu\u1ea7n t\u1ef1 trong s\u01a1 \u0111\u1ed3 Chu\u1ed7i. Trong s\u01a1 \u0111\u1ed3 Th\u1eddi gian, n\u1ebfu hai l\u1eddi g\u1ecdi x\u1ea3y ra \u0111\u1ed3ng th\u1eddi tr\u00ean c\u00e1c l\u00f5i kh\u00e1c nhau, th\u1eddi l\u01b0\u1ee3ng t\u1ed5ng th\u1ec3 s\u1ebd gi\u1ea3m. S\u01a1 \u0111\u1ed3 Th\u1eddi gian ghi nh\u1eadn r\u00f5 r\u00e0ng s\u1ef1 t\u1ed1i \u01b0u h\u00f3a n\u00e0y.<\/p>\n

        Ph\u00e2n t\u00edch so s\u00e1nh: Chu\u1ed7i so v\u1edbi Th\u1eddi gian \ud83d\udccb<\/h2>\n

        \u0110\u1ec3 hi\u1ec3u r\u00f5 c\u00e1c \u0111i\u1ec3m \u0111\u00e1nh \u0111\u1ed5i, ch\u00fang ta c\u00f3 th\u1ec3 so s\u00e1nh hai ph\u01b0\u01a1ng ph\u00e1p m\u00f4 h\u00ecnh h\u00f3a tr\u00ean nhi\u1ec1u kh\u00eda c\u1ea1nh kh\u00e1c nhau. B\u1ea3ng sau \u0111\u00e2y n\u00eau r\u00f5 c\u00e1c kh\u00e1c bi\u1ec7t v\u1ec1 c\u1ea5u tr\u00fac v\u00e0 ch\u1ee9c n\u0103ng.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n
        T\u00ednh n\u0103ng<\/th>\nS\u01a1 \u0111\u1ed3 Chu\u1ed7i<\/th>\nS\u01a1 \u0111\u1ed3 Th\u1eddi gian<\/th>\n<\/tr>\n<\/thead>\n
        Tr\u1ecdng t\u00e2m ch\u00ednh<\/strong><\/td>\nTh\u1ee9 t\u1ef1 t\u01b0\u01a1ng t\u00e1c<\/td>\nTh\u1eddi l\u01b0\u1ee3ng c\u1ee7a tr\u1ea1ng th\u00e1i<\/td>\n<\/tr>\n
        Bi\u1ec3u di\u1ec5n Th\u1eddi gian<\/strong><\/td>\nT\u01b0\u01a1ng \u0111\u1ed1i \/ Ng\u1ea7m \u0111\u1ecbnh<\/td>\nTuy\u1ec7t \u0111\u1ed1i \/ Thang \u0111o r\u00f5 r\u00e0ng<\/td>\n<\/tr>\n
        \u0110\u01b0\u1eddng \u0111\u1eddi<\/strong><\/td>\n\u0110\u1ed1i t\u01b0\u1ee3ng \/ Th\u00e0nh ph\u1ea7n<\/td>\n\u0110\u1ed1i t\u01b0\u1ee3ng \/ Bi\u1ebfn \/ \u0110\u1ed3ng h\u1ed3<\/td>\n<\/tr>\n
        Kh\u1ea3 n\u0103ng hi\u1ec3n th\u1ecb Tr\u1ea1ng th\u00e1i<\/strong><\/td>\nThanh k\u00edch ho\u1ea1t<\/td>\nC\u00e1c b\u1ea5t bi\u1ebfn tr\u1ea1ng th\u00e1i \/ Gi\u00e1 tr\u1ecb t\u00edn hi\u1ec7u<\/td>\n<\/tr>\n
        \u0110\u1ed3ng th\u1eddi<\/strong><\/td>\nC\u00e1c thanh ch\u1ed3ng l\u1ea5n<\/td>\nC\u00e1c d\u00f2ng th\u1eddi gian song song<\/td>\n<\/tr>\n
        Tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng t\u1ed1t nh\u1ea5t<\/strong><\/td>\nLu\u1ed3ng logic \/ Thi\u1ebft k\u1ebf API<\/td>\n\u0110\u1ed9 tr\u1ec5 \/ Dao \u0111\u1ed9ng \/ H\u1ea1n ch\u00f3t<\/td>\n<\/tr>\n
        \u0110\u1ed9 ph\u1ee9c t\u1ea1p<\/strong><\/td>\nTh\u1ea5p \u0111\u1ebfn trung b\u00ecnh<\/td>\nTrung b\u00ecnh \u0111\u1ebfn cao<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

        Nh\u01b0 b\u1ea3ng ch\u1ec9 ra, vi\u1ec7c l\u1ef1a ch\u1ecdn ph\u1ee5 thu\u1ed9c v\u00e0o c\u00e2u h\u1ecfi c\u1ee5 th\u1ec3 \u0111ang \u0111\u01b0\u1ee3c \u0111\u1eb7t ra. N\u1ebfu c\u00e2u h\u1ecfi l\u00e0 \u201cTh\u00e0nh ph\u1ea7n A c\u00f3 g\u1ecdi th\u00e0nh ph\u1ea7n B tr\u01b0\u1edbc C kh\u00f4ng?\u201d, h\u00e3y s\u1eed d\u1ee5ng S\u01a1 \u0111\u1ed3 Chu\u1ed7i. N\u1ebfu c\u00e2u h\u1ecfi l\u00e0 \u201cTh\u00e0nh ph\u1ea7n A c\u00f3 ho\u00e0n th\u00e0nh tr\u01b0\u1edbc h\u1ea1n ch\u00f3t 500ms kh\u00f4ng?\u201d, h\u00e3y s\u1eed d\u1ee5ng S\u01a1 \u0111\u1ed3 Th\u1eddi gian.<\/p>\n

        Khung quy\u1ebft \u0111\u1ecbnh: Khi n\u00e0o chuy\u1ec3n \u0111\u1ed5i \ud83d\udd04<\/h2>\n

        Vi\u1ec7c chuy\u1ec3n t\u1eeb t\u1eadp trung v\u00e0o S\u01a1 \u0111\u1ed3 Chu\u1ed7i sang t\u1eadp trung v\u00e0o S\u01a1 \u0111\u1ed3 Th\u1eddi gian kh\u00f4ng ph\u1ea3i l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh nh\u1ecb ph\u00e2n m\u00e0 l\u00e0 m\u1ed9t qu\u00e1 tr\u00ecnh d\u1ef1a tr\u00ean y\u00eau c\u1ea7u h\u1ec7 th\u1ed1ng. D\u01b0\u1edbi \u0111\u00e2y l\u00e0 c\u00e1c t\u00ecnh hu\u1ed1ng c\u1ee5 th\u1ec3 \u0111\u00f2i h\u1ecfi ph\u1ea3i chuy\u1ec3n \u0111\u1ed5i.<\/p>\n

        1. Y\u00eau c\u1ea7u th\u1eddi gian th\u1ef1c nghi\u00eam ng\u1eb7t<\/h3>\n

        C\u00e1c h\u1ec7 th\u1ed1ng ph\u1ea3i ph\u1ea3n h\u1ed3i trong khung th\u1eddi gian \u0111\u01b0\u1ee3c \u0111\u1ea3m b\u1ea3o (v\u00ed d\u1ee5: h\u1ec7 th\u1ed1ng phanh \u00f4 t\u00f4, thi\u1ebft b\u1ecb y t\u1ebf) y\u00eau c\u1ea7u s\u1eed d\u1ee5ng S\u01a1 \u0111\u1ed3 Th\u1eddi gian. S\u01a1 \u0111\u1ed3 Chu\u1ed7i kh\u00f4ng th\u1ec3 \u0111\u1ea3m b\u1ea3o c\u00e1c gi\u1edbi h\u1ea1n v\u1ec1 th\u1eddi gian c\u1ea7n thi\u1ebft cho vi\u1ec7c ch\u1ee9ng nh\u1eadn. S\u01a1 \u0111\u1ed3 Th\u1eddi gian cho ph\u00e9p \u0111\u1ecbnh ngh\u0129a c\u00e1c y\u1ebfu t\u1ed1 timingConstraint<\/code>c\u00e1c y\u1ebfu t\u1ed1 x\u00e1c minh h\u1ec7 th\u1ed1ng \u0111\u00e1p \u1ee9ng c\u00e1c ti\u00eau chu\u1ea9n an to\u00e0n.<\/p>\n

        2. M\u00f4i tr\u01b0\u1eddng \u0111\u1ed3ng th\u1eddi cao<\/h3>\n

        Trong c\u00e1c h\u1ec7 th\u1ed1ng \u0111a lu\u1ed3ng ho\u1eb7c ph\u00e2n t\u00e1n, th\u1ee9 t\u1ef1 c\u00e1c s\u1ef1 ki\u1ec7n c\u00f3 th\u1ec3 thay \u0111\u1ed5i, nh\u01b0ng m\u1ed1i quan h\u1ec7 v\u1ec1 th\u1eddi gian ph\u1ea3i duy tr\u00ec nh\u1ea5t qu\u00e1n. S\u01a1 \u0111\u1ed3 Th\u1eddi gian c\u00f3 th\u1ec3 cho th\u1ea5y r\u1eb1ng m\u1eb7c d\u00f9 Lu\u1ed3ng A v\u00e0 Lu\u1ed3ng B ch\u1ea1y \u0111\u1ed3ng th\u1eddi, Lu\u1ed3ng A kh\u00f4ng \u0111\u01b0\u1ee3c v\u01b0\u1ee3t qu\u00e1 m\u1ed9t kho\u1ea3ng th\u1eddi gian nh\u1ea5t \u0111\u1ecbnh tr\u01b0\u1edbc khi Lu\u1ed3ng B ti\u1ebfp t\u1ee5c. S\u01a1 \u0111\u1ed3 Chu\u1ed7i th\u01b0\u1eddng gi\u1ea3 \u0111\u1ecbnh th\u1ee9 t\u1ef1 nghi\u00eam ng\u1eb7t, \u0111i\u1ec1u n\u00e0y kh\u00f4ng t\u1ed3n t\u1ea1i trong c\u00e1c ki\u1ebfn tr\u00fac song song th\u1ef1c s\u1ef1.<\/p>\n

        3. Ph\u00e2n t\u00edch \u0111\u1ed9 tr\u1ec5 v\u00e0 dao \u0111\u1ed9ng<\/h3>\n

        Dao \u0111\u1ed9ng l\u00e0 s\u1ef1 thay \u0111\u1ed5i v\u1ec1 \u0111\u1ed9 tr\u1ec5 theo th\u1eddi gian. S\u01a1 \u0111\u1ed3 Chu\u1ed7i ch\u1ec9 hi\u1ec3n th\u1ecb m\u1ed9t \u0111\u01b0\u1eddng \u0111i duy nh\u1ea5t. S\u01a1 \u0111\u1ed3 Th\u1eddi gian c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb nhi\u1ec1u \u0111\u01b0\u1eddng \u0111i v\u1edbi c\u00e1c kho\u1ea3ng th\u1eddi gian kh\u00e1c nhau \u0111\u1ec3 bi\u1ec3u di\u1ec5n dao \u0111\u1ed9ng. N\u1ebfu ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t y\u00eau c\u1ea7u hi\u1ec3u \u0111\u01b0\u1ee3c s\u1ef1 bi\u1ebfn thi\u00ean v\u1ec1 th\u1eddi gian ph\u1ea3n h\u1ed3i (v\u00ed d\u1ee5: \u0111\u1ed9 tr\u1ec5 \u1edf ph\u00e2n v\u1ecb th\u1ee9 95), th\u00ec S\u01a1 \u0111\u1ed3 Th\u1eddi gian l\u00e0 c\u00f4ng c\u1ee5 ph\u00f9 h\u1ee3p.<\/p>\n

        4. M\u00f4 h\u00ecnh h\u00f3a xung \u0111\u1ed9t t\u00e0i nguy\u00ean<\/h3>\n

        Khi m\u00f4 h\u00ecnh h\u00f3a xung \u0111\u1ed9t t\u00e0i nguy\u00ean, ch\u1eb3ng h\u1ea1n nh\u01b0 s\u1eed d\u1ee5ng CPU ho\u1eb7c b\u0103ng th\u00f4ng b\u1ed9 nh\u1edb, S\u01a1 \u0111\u1ed3 Th\u1eddi gian v\u01b0\u1ee3t tr\u1ed9i h\u01a1n. Ch\u00fang c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb c\u00e1c bi\u1ebfn tr\u1ea1ng th\u00e1i \u0111\u1ea1i di\u1ec7n cho kh\u1ea3 n\u0103ng s\u1eb5n s\u00e0ng c\u1ee7a t\u00e0i nguy\u00ean. C\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 h\u00ecnh dung \u0111\u01b0\u1ee3c khi n\u00e0o t\u00e0i nguy\u00ean \u0111ang b\u1eadn so v\u1edbi khi \u0111ang r\u1ea3nh, t\u1eeb \u0111\u00f3 h\u1ed7 tr\u1ee3 l\u1eadp k\u1ebf ho\u1ea1ch dung l\u01b0\u1ee3ng t\u1ed1t h\u01a1n.<\/p>\n

        M\u00f4 h\u00ecnh h\u00f3a c\u00e1c ch\u1ec9 s\u1ed1 hi\u1ec7u su\u1ea5t \u2013 Ph\u00e2n t\u00edch s\u00e2u \ud83d\udccf<\/h2>\n

        Sau khi chuy\u1ec3n sang s\u1eed d\u1ee5ng S\u01a1 \u0111\u1ed3 Th\u1eddi gian, tr\u1ecdng t\u00e2m s\u1ebd chuy\u1ec3n sang c\u00e1c ch\u1ec9 s\u1ed1 c\u1ee5 th\u1ec3. Nh\u1eefng ch\u1ec9 s\u1ed1 n\u00e0y ph\u1ea3i \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a ch\u00ednh x\u00e1c \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o s\u01a1 \u0111\u1ed3 ph\u1ea3n \u00e1nh \u0111\u00fang th\u1ef1c t\u1ebf.<\/p>\n

        \u0110\u1ed9 tr\u1ec5<\/h3>\n

        \u0110\u1ed9 tr\u1ec5 l\u00e0 t\u1ed5ng th\u1eddi gian t\u1eeb l\u00fac kh\u1edfi t\u1ea1o y\u00eau c\u1ea7u \u0111\u1ebfn khi ho\u00e0n th\u00e0nh ph\u1ea3n h\u1ed3i. Trong S\u01a1 \u0111\u1ed3 Th\u1eddi gian, \u0111\u00e2y l\u00e0 kho\u1ea3ng th\u1eddi gian gi\u1eefa s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t tr\u00ean \u0111\u01b0\u1eddng s\u1ed1ng \u0111\u1ea7u ti\u00ean v\u00e0 s\u1ef1 ki\u1ec7n tr\u1ea3 v\u1ec1 tr\u00ean \u0111\u01b0\u1eddng s\u1ed1ng cu\u1ed1i c\u00f9ng. \u0110\u1ec3 m\u00f4 h\u00ecnh h\u00f3a \u0111i\u1ec1u n\u00e0y:<\/p>\n

          \n
        • Ghi ch\u00fa th\u1eddi \u0111i\u1ec3m b\u1eaft \u0111\u1ea7u c\u1ee7a s\u1ef1 ki\u1ec7n k\u00edch ho\u1ea1t.<\/li>\n
        • Ghi ch\u00fa th\u1eddi \u0111i\u1ec3m k\u1ebft th\u00fac c\u1ee7a s\u1ef1 ki\u1ec7n ph\u1ea3n h\u1ed3i cu\u1ed1i c\u00f9ng.<\/li>\n
        • S\u1eed d\u1ee5ng ch\u00fa th\u00edch r\u00e0ng bu\u1ed9c \u0111\u1ec3 x\u00e1c \u0111\u1ecbnh kho\u1ea3ng th\u1eddi gian cho ph\u00e9p t\u1ed1i \u0111a.<\/li>\n<\/ul>\n

          T\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd<\/h3>\n

          T\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd \u0111o l\u01b0\u1eddng s\u1ed1 l\u01b0\u1ee3ng s\u1ef1 ki\u1ec7n \u0111\u01b0\u1ee3c x\u1eed l\u00fd tr\u00ean m\u1ed7i \u0111\u01a1n v\u1ecb th\u1eddi gian. M\u00f4 h\u00ecnh h\u00f3a t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd trong s\u01a1 \u0111\u1ed3 Th\u1eddi gian bao g\u1ed3m c\u00e1c m\u1eabu l\u1eb7p l\u1ea1i. S\u1eed d\u1ee5ng c\u00e1c \u0111o\u1ea1n v\u00f2ng l\u1eb7p ho\u1eb7c k\u00fd hi\u1ec7u l\u1eb7p l\u1ea1i \u0111\u1ec3 ch\u1ec9 ra lu\u1ed3ng y\u00eau c\u1ea7u \u1ed5n \u0111\u1ecbnh. M\u1eadt \u0111\u1ed9 c\u00e1c s\u1ef1 ki\u1ec7n d\u1ecdc theo tr\u1ee5c th\u1eddi gian th\u1ec3 hi\u1ec7n tr\u1ef1c quan t\u1ed1c \u0111\u1ed9 x\u1eed l\u00fd.<\/p>\n

          H\u1ea1n ch\u00f3t v\u00e0 Th\u1eddi gian ch\u1edd qu\u00e1 h\u1ea1n<\/h3>\n

          H\u1ea1n ch\u00f3t r\u1ea5t quan tr\u1ecdng trong m\u00f4 h\u00ecnh h\u00f3a hi\u1ec7u su\u1ea5t. S\u01a1 \u0111\u1ed3 Th\u1eddi gian c\u00f3 th\u1ec3 bao g\u1ed3m m\u1ed9t \u0111\u01b0\u1eddng n\u00e9t \u0111\u1ee9t \u0111\u1ee9ng \u0111\u1ea1i di\u1ec7n cho h\u1ea1n ch\u00f3t. N\u1ebfu tr\u1ea1ng th\u00e1i qu\u00e1 tr\u00ecnh k\u00e9o d\u00e0i v\u01b0\u1ee3t qu\u00e1 \u0111\u01b0\u1eddng n\u00e0y, \u0111i\u1ec1u \u0111\u00f3 cho th\u1ea5y vi ph\u1ea1m. D\u1ea5u hi\u1ec7u tr\u1ef1c quan n\u00e0y mang t\u00ednh c\u1ea3nh b\u00e1o nhanh h\u01a1n so v\u1edbi vi\u1ec7c \u0111\u1ecdc m\u1ed9t r\u00e0ng bu\u1ed9c v\u0103n b\u1ea3n trong S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1.<\/p>\n

          S\u1ef1 dao \u0111\u1ed9ng v\u00e0 \u0110\u1ed9 l\u1ec7ch<\/h3>\n

          S\u1ef1 dao \u0111\u1ed9ng \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1edfi s\u1ef1 kh\u00f4ng nh\u1ea5t qu\u00e1n trong kho\u1ea3ng th\u1eddi gian gi\u1eefa c\u00e1c s\u1ef1 ki\u1ec7n. N\u1ebfu m\u1ed9t t\u00e1c v\u1ee5 \u0111\u1ecbnh k\u1ef3 c\u1ea7n \u0111\u01b0\u1ee3c k\u00edch ho\u1ea1t m\u1ed7i 10ms, nh\u01b0ng th\u1eddi gian th\u1ef1c t\u1ebf thay \u0111\u1ed5i t\u1eeb 9ms \u0111\u1ebfn 12ms, s\u01a1 \u0111\u1ed3 Th\u1eddi gian c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb s\u1ef1 thay \u0111\u1ed5i n\u00e0y. \u0110i\u1ec1u n\u00e0y r\u1ea5t quan tr\u1ecdng \u0111\u1ed1i v\u1edbi c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e1t tr\u1ef1c tuy\u1ebfn \u00e2m thanh\/\u1ea3nh ho\u1eb7c x\u1eed l\u00fd g\u00f3i tin m\u1ea1ng.<\/p>\n

          C\u00e1c y\u1ebfu t\u1ed1 k\u1ef9 thu\u1eadt c\u1ee7a S\u01a1 \u0111\u1ed3 Th\u1eddi gian \ud83d\udd27<\/h2>\n

          \u0110\u1ec3 s\u1eed d\u1ee5ng S\u01a1 \u0111\u1ed3 Th\u1eddi gian hi\u1ec7u qu\u1ea3, ng\u01b0\u1eddi d\u00f9ng ph\u1ea3i hi\u1ec3u r\u00f5 c\u00e1c y\u1ebfu t\u1ed1 UML c\u1ee5 th\u1ec3 li\u00ean quan. Nh\u1eefng y\u1ebfu t\u1ed1 n\u00e0y kh\u00e1c bi\u1ec7t v\u1edbi k\u00fd hi\u1ec7u chu\u1ea9n trong S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1.<\/p>\n

          Bi\u1ebfn tr\u1ea1ng th\u00e1i<\/h3>\n

          Kh\u00e1c v\u1edbi S\u01a1 \u0111\u1ed3 Th\u1ee9 t\u1ef1 t\u1eadp trung v\u00e0o c\u00e1c \u0111\u01b0\u1eddng \u0111\u1eddi \u0111\u1ed1i t\u01b0\u1ee3ng, S\u01a1 \u0111\u1ed3 Th\u1eddi gian th\u01b0\u1eddng t\u1eadp trung v\u00e0o c\u00e1c bi\u1ebfn tr\u1ea1ng th\u00e1i. M\u1ed9t bi\u1ebfn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a nh\u01b0 m\u1ed9t \u0111\u01b0\u1eddng \u0111\u1eddi, trong \u0111\u00f3 c\u00e1c thay \u0111\u1ed5i tr\u1ea1ng th\u00e1i \u0111\u01b0\u1ee3c bi\u1ec3u di\u1ec5n b\u1eb1ng c\u00e1c b\u01b0\u1edbc. V\u00ed d\u1ee5, m\u1ed9t bi\u1ebfnnhi\u1ec7t \u0111\u1ed9<\/code>c\u00f3 th\u1ec3 c\u00f3 m\u1ed9t chuy\u1ec3n \u0111\u1ed5i tr\u1ea1ng th\u00e1i t\u1eebb\u00ecnh th\u01b0\u1eddng<\/code>sangnguy hi\u1ec3m<\/code>t\u1ea1i m\u1ed9t \u0111i\u1ec3m th\u1eddi gian c\u1ee5 th\u1ec3.<\/p>\n

          R\u00e0ng bu\u1ed9c Th\u1eddi gian<\/h3>\n

          \u0110\u00e2y l\u00e0 c\u00e1c ch\u00fa th\u00edch \u0111\u01b0\u1ee3c g\u1eafn v\u00e0o c\u00e1c chuy\u1ec3n ti\u1ebfp ho\u1eb7c s\u1ef1 ki\u1ec7n. Ch\u00fang x\u00e1c \u0111\u1ecbnh m\u1ed1i quan h\u1ec7 v\u1ec1 th\u1eddi gian. C\u00e1c r\u00e0ng bu\u1ed9c ph\u1ed5 bi\u1ebfn bao g\u1ed3m:<\/p>\n

            \n
          • t\u1ed1i thi\u1ec3u:<\/strong>Th\u1eddi \u0111i\u1ec3m s\u1edbm nh\u1ea5t m\u00e0 m\u1ed9t s\u1ef1 ki\u1ec7n c\u00f3 th\u1ec3 x\u1ea3y ra.<\/li>\n
          • t\u1ed1i \u0111a:<\/strong>Th\u1eddi \u0111i\u1ec3m mu\u1ed9n nh\u1ea5t m\u00e0 m\u1ed9t s\u1ef1 ki\u1ec7n ph\u1ea3i x\u1ea3y ra.<\/li>\n
          • ch\u00ednh x\u00e1c:<\/strong>M\u1ed9t \u0111i\u1ec3m th\u1eddi gian ch\u00ednh x\u00e1c cho m\u1ed9t s\u1ef1 ki\u1ec7n.<\/li>\n
          • kho\u1ea3ng th\u1eddi gian:<\/strong>M\u1ed9t kho\u1ea3ng th\u1eddi gian trong \u0111\u00f3 s\u1ef1 ki\u1ec7n ph\u1ea3i x\u1ea3y ra.<\/li>\n<\/ul>\n

            Gi\u00e1 tr\u1ecb t\u00edn hi\u1ec7u<\/h3>\n

            S\u01a1 \u0111\u1ed3 Th\u1eddi gian c\u00f3 th\u1ec3 hi\u1ec3n th\u1ecb gi\u00e1 tr\u1ecb c\u1ee7a t\u00edn hi\u1ec7u theo th\u1eddi gian. \u0110i\u1ec1u n\u00e0y h\u1eefu \u00edch \u0111\u1ec3 gi\u00e1m s\u00e1t t\u1ea3i bus ho\u1eb7c t\u1ed1c \u0111\u1ed9 d\u1eef li\u1ec7u. M\u1ed9t \u0111\u01b0\u1eddng li\u00ean t\u1ee5c c\u00f3 th\u1ec3 \u0111\u1ea1i di\u1ec7n cho gi\u00e1 tr\u1ecb t\u00edn hi\u1ec7u, v\u1edbi c\u00e1c b\u01b0\u1edbc \u0111\u1ee9ng bi\u1ec3u th\u1ecb s\u1ef1 thay \u0111\u1ed5i trong lu\u1ed3ng d\u1eef li\u1ec7u.<\/p>\n

            Nh\u1eefng sai l\u1ea7m ph\u1ed5 bi\u1ebfn trong m\u00f4 h\u00ecnh h\u00f3a \u26a0\ufe0f<\/h2>\n

            Chuy\u1ec3n sang s\u01a1 \u0111\u1ed3 th\u1eddi gian mang l\u1ea1i nh\u1eefng ph\u1ee9c t\u1ea1p m\u1edbi. C\u00e1c k\u1ef9 s\u01b0 th\u01b0\u1eddng r\u01a1i v\u00e0o nh\u1eefng c\u00e1i b\u1eaby l\u00e0m gi\u1ea3m gi\u00e1 tr\u1ecb c\u1ee7a m\u00f4 h\u00ecnh.<\/p>\n

            1. M\u00f4 h\u00ecnh h\u00f3a qu\u00e1 m\u1ee9c logic t\u0129nh<\/h3>\n

            Kh\u00f4ng ph\u1ea3i m\u1ecdi t\u01b0\u01a1ng t\u00e1c n\u00e0o c\u0169ng c\u1ea7n s\u01a1 \u0111\u1ed3 th\u1eddi gian. N\u1ebfu logic l\u00e0 thu\u1ea7n t\u00fay tu\u1ea7n t\u1ef1 v\u00e0 th\u1eddi gian kh\u00f4ng quan tr\u1ecdng, s\u01a1 \u0111\u1ed3 th\u1eddi gian s\u1ebd th\u00eam s\u1ef1 ph\u1ee9c t\u1ea1p kh\u00f4ng c\u1ea7n thi\u1ebft. D\u00e0nh ch\u00fang cho c\u00e1c \u0111\u01b0\u1eddng d\u1eabn quan tr\u1ecdng v\u1ec1 hi\u1ec7u su\u1ea5t.<\/p>\n

            2. B\u1ecf qua c\u00e1c mi\u1ec1n \u0111\u1ed3ng h\u1ed3<\/h3>\n

            Trong c\u00e1c h\u1ec7 th\u1ed1ng ph\u00e2n t\u00e1n, c\u00e1c th\u00e0nh ph\u1ea7n kh\u00e1c nhau c\u00f3 th\u1ec3 ho\u1ea1t \u0111\u1ed9ng tr\u00ean c\u00e1c mi\u1ec1n \u0111\u1ed3ng h\u1ed3 kh\u00e1c nhau. S\u01a1 \u0111\u1ed3 th\u1eddi gian gi\u1ea3 \u0111\u1ecbnh tr\u1ee5c th\u1eddi gian \u0111\u1ed3ng b\u1ed9. N\u1ebfu c\u00e1c th\u00e0nh ph\u1ea7n b\u1ea5t \u0111\u1ed3ng b\u1ed9, s\u01a1 \u0111\u1ed3 ph\u1ea3i t\u00ednh \u0111\u1ebfn \u0111\u1ed9 l\u1ec7ch \u0111\u1ed3ng h\u1ed3 ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c d\u00f2ng th\u1eddi gian ri\u00eang bi\u1ec7t v\u1edbi c\u00e1c \u0111i\u1ec3m \u0111\u1ed3ng b\u1ed9.<\/p>\n

            3. \u0110\u01a1n v\u1ecb thang \u0111o m\u01a1 h\u1ed3<\/h3>\n

            Lu\u00f4n x\u00e1c \u0111\u1ecbnh thang th\u1eddi gian m\u1ed9t c\u00e1ch r\u00f5 r\u00e0ng (v\u00ed d\u1ee5: ms, \u00b5s, ns). Vi\u1ec7c tr\u1ed9n l\u1eabn c\u00e1c \u0111\u01a1n v\u1ecb m\u00e0 kh\u00f4ng c\u00f3 nh\u00e3n r\u00f5 r\u00e0ng s\u1ebd d\u1eabn \u0111\u1ebfn hi\u1ec3u nh\u1ea7m. M\u1ed9t thang \u0111o 100 c\u00f3 th\u1ec3 c\u00f3 ngh\u0129a l\u00e0 100 mili gi\u00e2y ho\u1eb7c 100 nano gi\u00e2y. S\u1ef1 r\u00f5 r\u00e0ng l\u00e0 \u0111i\u1ec1u t\u1ed1i quan tr\u1ecdng.<\/p>\n

            4. B\u1ecf qua c\u00e1c kho\u1ea3ng th\u1eddi gian ch\u1edd<\/h3>\n

            Hi\u1ec7u su\u1ea5t th\u01b0\u1eddng \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh b\u1edfi nh\u1eefng g\u00ec x\u1ea3y ra khi h\u1ec7 th\u1ed1ng \u0111ang ch\u1edd. S\u01a1 \u0111\u1ed3 th\u1eddi gian n\u00ean th\u1ec3 hi\u1ec7n c\u00e1c kho\u1ea3ng th\u1eddi gian kh\u00f4ng ho\u1ea1t \u0111\u1ed9ng \u0111\u1ec3 t\u00ednh t\u1ef7 l\u1ec7 s\u1eed d\u1ee5ng. B\u1ecf qua th\u1eddi gian ch\u1edd c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn \u0111\u00e1nh gi\u00e1 qu\u00e1 cao kh\u1ea3 n\u0103ng c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n

            T\u00edch h\u1ee3p v\u1edbi ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng \ud83c\udfd7\ufe0f<\/h2>\n

            S\u01a1 \u0111\u1ed3 th\u1eddi gian kh\u00f4ng t\u1ed3n t\u1ea1i m\u1ed9t c\u00e1ch c\u00f4 l\u1eadp. Ch\u00fang ph\u1ea3i t\u00edch h\u1ee3p v\u1edbi t\u00e0i li\u1ec7u ki\u1ebfn tr\u00fac h\u1ec7 th\u1ed1ng r\u1ed9ng l\u1edbn h\u01a1n.<\/p>\n

            Li\u00ean k\u1ebft v\u1edbi s\u01a1 \u0111\u1ed3 tri\u1ec3n khai<\/h3>\n

            C\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng trong s\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i t\u01b0\u01a1ng \u1ee9ng v\u1edbi c\u00e1c n\u00fat v\u1eadt l\u00fd ho\u1eb7c c\u00e1c ph\u00e2n v\u00f9ng logic \u0111\u01b0\u1ee3c x\u00e1c \u0111\u1ecbnh trong s\u01a1 \u0111\u1ed3 tri\u1ec3n khai. \u0110i\u1ec1u n\u00e0y \u0111\u1ea3m b\u1ea3o ph\u00e2n t\u00edch th\u1eddi gian ph\u1ea3n \u00e1nh \u0111\u00fang ki\u1ebfn tr\u00fac ph\u1ea7n c\u1ee9ng ho\u1eb7c m\u1ea1ng th\u1ef1c t\u1ebf. V\u00ed d\u1ee5, \u0111\u1ed9 tr\u1ec5 gi\u1eefa hai \u0111\u01b0\u1eddng s\u1ed1ng ph\u1ea3i t\u01b0\u01a1ng \u1ee9ng v\u1edbi \u0111\u1ed9 tr\u1ec5 m\u1ea1ng gi\u1eefa c\u00e1c m\u00e1y ch\u1ee7 m\u00e0 ch\u00fang \u0111\u1ea1i di\u1ec7n.<\/p>\n

            Kh\u1ea3 n\u0103ng truy xu\u1ea5t ngu\u1ed3n g\u1ed1c \u0111\u1ebfn y\u00eau c\u1ea7u<\/h3>\n

            M\u1ed7i r\u00e0ng bu\u1ed9c th\u1eddi gian trong s\u01a1 \u0111\u1ed3 ph\u1ea3i c\u00f3 th\u1ec3 truy xu\u1ea5t ng\u01b0\u1ee3c l\u1ea1i \u0111\u1ebfn m\u1ed9t y\u00eau c\u1ea7u phi ch\u1ee9c n\u0103ng. Kh\u1ea3 n\u0103ng truy xu\u1ea5t n\u00e0y l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft cho vi\u1ec7c x\u00e1c minh v\u00e0 ki\u1ec3m ch\u1ee9ng. N\u1ebfu m\u1ed9t y\u00eau c\u1ea7u n\u00eau r\u00f5 \u201cH\u1ec7 th\u1ed1ng ph\u1ea3i ph\u1ea3n h\u1ed3i trong 200ms\u201d, s\u01a1 \u0111\u1ed3 th\u1eddi gian ph\u1ea3i hi\u1ec3n th\u1ecb r\u00f5 r\u00e0ng r\u00e0ng bu\u1ed9c n\u00e0y v\u00e0 th\u1eddi gian m\u00f4 ph\u1ecfng th\u1ef1c t\u1ebf.<\/p>\n

            B\u1ea3o tr\u00ec v\u00e0 ph\u00e1t tri\u1ec3n \ud83d\udd04<\/h2>\n

            Khi h\u1ec7 th\u1ed1ng ph\u00e1t tri\u1ec3n, s\u01a1 \u0111\u1ed3 th\u1eddi gian c\u1ea7n \u0111\u01b0\u1ee3c b\u1ea3o tr\u00ec. C\u00e1c \u0111\u1eb7c t\u00ednh hi\u1ec7u su\u1ea5t thay \u0111\u1ed5i theo c\u00e1c b\u1ea3n c\u1eadp nh\u1eadt, thay \u0111\u1ed5i t\u1ea3i v\u00e0 thay \u0111\u1ed5i h\u1ea1 t\u1ea7ng.<\/p>\n

              \n
            • Ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n:<\/strong>Xem s\u01a1 \u0111\u1ed3 th\u1eddi gian nh\u01b0 m\u00e3 ngu\u1ed3n. L\u01b0u tr\u1eef ch\u00fang trong h\u1ec7 th\u1ed1ng ki\u1ec3m so\u00e1t phi\u00ean b\u1ea3n \u0111\u1ec3 theo d\u00f5i c\u00e1c thay \u0111\u1ed5i v\u1ec1 r\u00e0ng bu\u1ed9c th\u1eddi gian qua c\u00e1c phi\u00ean b\u1ea3n ph\u00e1t h\u00e0nh.<\/li>\n
            • Ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t:<\/strong>C\u1eadp nh\u1eadt s\u01a1 \u0111\u1ed3 d\u1ef1a tr\u00ean d\u1eef li\u1ec7u ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t th\u1ef1c t\u1ebf. N\u1ebfu m\u1ed9t th\u00e0nh ph\u1ea7n m\u1ea5t nhi\u1ec1u th\u1eddi gian h\u01a1n trong m\u00f4i tr\u01b0\u1eddng s\u1ea3n xu\u1ea5t so v\u1edbi m\u00f4 h\u00ecnh h\u00f3a, h\u00e3y c\u1eadp nh\u1eadt r\u00e0ng bu\u1ed9c \u0111\u1ec3 ph\u1ea3n \u00e1nh \u0111\u00fang th\u1ef1c t\u1ebf.<\/li>\n
            • C\u1eadp nh\u1eadt t\u00ecnh hu\u1ed1ng:<\/strong>C\u00e1c t\u00ednh n\u0103ng m\u1edbi s\u1ebd t\u1ea1o ra c\u00e1c \u0111\u01b0\u1eddng \u0111i th\u1eddi gian m\u1edbi. \u0110\u1ea3m b\u1ea3o t\u1ea5t c\u1ea3 c\u00e1c \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng \u0111\u1ec1u \u0111\u01b0\u1ee3c c\u1eadp nh\u1eadt \u0111\u1ec3 tr\u00e1nh kho\u1ea3ng tr\u1ed1ng trong ph\u00e2n t\u00edch.<\/li>\n<\/ul>\n

              C\u00e1c th\u1ef1c h\u00e0nh t\u1ed1t nh\u1ea5t cho m\u00f4 h\u00ecnh h\u00f3a hi\u1ec7u su\u1ea5t \u2705<\/h2>\n

              \u0110\u1ec3 t\u1ed1i \u0111a h\u00f3a gi\u00e1 tr\u1ecb c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian, h\u00e3y tu\u00e2n theo c\u00e1c th\u1ef1c h\u00e0nh \u0111\u00e3 \u0111\u01b0\u1ee3c thi\u1ebft l\u1eadp n\u00e0y.<\/p>\n

                \n
              • Gi\u1eef c\u00e1c \u0111\u01b0\u1eddng s\u1ed1ng \u0111\u01a1n gi\u1ea3n:<\/strong>Tr\u00e1nh qu\u00e1 nhi\u1ec1u \u0111\u01b0\u1eddng s\u1ed1ng. T\u1eadp trung v\u00e0o \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng. Gom c\u00e1c th\u00e0nh ph\u1ea7n li\u00ean quan l\u1ea1i n\u1ebfu c\u1ea7n thi\u1ebft.<\/li>\n
              • S\u1eed d\u1ee5ng k\u00fd hi\u1ec7u chu\u1ea9n:<\/strong>Tu\u00e2n th\u1ee7 c\u00e1c ti\u00eau chu\u1ea9n UML 2.5 cho r\u00e0ng bu\u1ed9c v\u00e0 \u0111\u01b0\u1eddng s\u1ed1ng \u0111\u1ec3 \u0111\u1ea3m b\u1ea3o t\u00ednh nh\u1ea5t qu\u00e1n trong to\u00e0n \u0111\u1ed9i.<\/li>\n
              • Nh\u1ea5n m\u1ea1nh c\u00e1c \u0111\u01b0\u1eddng \u0111i quan tr\u1ecdng:<\/strong> S\u1eed d\u1ee5ng m\u00e0u s\u1eafc ho\u1eb7c in \u0111\u1eadm \u0111\u1ec3 ch\u1ec9 ra c\u00e1c \u0111\u01b0\u1eddng d\u1eabn \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/li>\n
              • Ghi ch\u00fa c\u00e1c gi\u1ea3 \u0111\u1ecbnh:<\/strong>Ghi ch\u00fa b\u1ea5t k\u1ef3 gi\u1ea3 \u0111\u1ecbnh n\u00e0o v\u1ec1 t\u1ed1c \u0111\u1ed9 m\u1ea1ng ho\u1eb7c s\u1ee9c m\u1ea1nh x\u1eed l\u00fd. Nh\u1eefng gi\u1ea3 \u0111\u1ecbnh n\u00e0y \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn t\u00ednh h\u1ee3p l\u1ec7 c\u1ee7a ph\u00e2n t\u00edch th\u1eddi gian.<\/li>\n
              • Xem x\u00e9t th\u01b0\u1eddng xuy\u00ean:<\/strong>L\u00ean l\u1ecbch xem x\u00e9t c\u00e1c s\u01a1 \u0111\u1ed3 th\u1eddi gian trong c\u00e1c v\u00f2ng l\u1eb7p thi\u1ebft k\u1ebf. Ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1c vi ph\u1ea1m th\u1eddi gian s\u1ebd ti\u1ebft ki\u1ec7m \u0111\u00e1ng k\u1ec3 n\u1ed7 l\u1ef1c t\u00e1i c\u1ea5u tr\u00fac v\u1ec1 sau.<\/li>\n<\/ul>\n

                Nh\u1eefng c\u00e2n nh\u1eafc cu\u1ed1i c\u00f9ng cho c\u00e1c \u0111\u1ed9i k\u1ef9 thu\u1eadt \ud83d\udc65<\/h2>\n

                Vi\u1ec7c ch\u1ecdn k\u00fd hi\u1ec7u m\u00f4 h\u00ecnh h\u00f3a ph\u00f9 h\u1ee3p l\u00e0 m\u1ed9t quy\u1ebft \u0111\u1ecbnh chi\u1ebfn l\u01b0\u1ee3c. S\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 v\u1eabn l\u00e0 m\u1eb7c \u0111\u1ecbnh cho logic v\u00e0 lu\u1ed3ng. S\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 c\u00f4ng c\u1ee5 chuy\u00ean bi\u1ec7t cho \u0111\u1ed9 ch\u00ednh x\u00e1c v\u1ec1 th\u1eddi gian. Vi\u1ec7c l\u1ef1a ch\u1ecdn kh\u00f4ng n\u00ean mang t\u00ednh ng\u1eabu nhi\u00ean.<\/p>\n

                C\u00e1c \u0111\u1ed9i n\u00ean \u0111\u00e1nh gi\u00e1 y\u00eau c\u1ea7u hi\u1ec7u su\u1ea5t c\u1ee7a m\u00ecnh tr\u01b0\u1edbc khi cam k\u1ebft v\u1edbi m\u1ed9t chi\u1ebfn l\u01b0\u1ee3c m\u00f4 h\u00ecnh h\u00f3a. N\u1ebfu h\u1ec7 th\u1ed1ng nh\u1ea1y c\u1ea3m v\u1edbi \u0111\u1ed9 tr\u1ec5, chi ph\u00ed t\u1ea1o s\u01a1 \u0111\u1ed3 th\u1eddi gian l\u00e0 h\u1ee3p l\u00fd nh\u1edd gi\u1ea3m thi\u1ec3u r\u1ee7i ro. N\u1ebfu h\u1ec7 th\u1ed1ng ch\u1ee7 y\u1ebfu d\u1ef1a tr\u00ean logic kinh doanh, s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 v\u1eabn \u0111\u1ee7 \u0111\u00e1p \u1ee9ng.<\/p>\n

                Cu\u1ed1i c\u00f9ng, m\u1ee5c ti\u00eau l\u00e0 s\u1ef1 r\u00f5 r\u00e0ng. D\u00f9 s\u1eed d\u1ee5ng s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 hay s\u01a1 \u0111\u1ed3 th\u1eddi gian, s\u01a1 \u0111\u1ed3 ph\u1ea3i truy\u1ec1n \u0111\u1ea1t ch\u00ednh x\u00e1c h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng \u0111\u1ebfn c\u00e1c b\u00ean li\u00ean quan, nh\u00e0 ph\u00e1t tri\u1ec3n v\u00e0 ng\u01b0\u1eddi ki\u1ec3m th\u1eed. B\u1eb1ng c\u00e1ch hi\u1ec3u r\u00f5 nh\u1eefng \u0111i\u1ec3m m\u1ea1nh c\u1ee5 th\u1ec3 c\u1ee7a s\u01a1 \u0111\u1ed3 th\u1eddi gian, c\u00e1c k\u1ef9 s\u01b0 c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o hi\u1ec7u su\u1ea5t kh\u00f4ng ph\u1ea3i l\u00e0 \u0111i\u1ec1u \u0111\u01b0\u1ee3c xem x\u00e9t sau c\u00f9ng m\u00e0 l\u00e0 th\u00e0nh ph\u1ea7n c\u1ed1t l\u00f5i trong thi\u1ebft k\u1ebf.<\/p>\n","protected":false},"excerpt":{"rendered":"

                Thi\u1ebft k\u1ebf c\u00e1c h\u1ec7 th\u1ed1ng hi\u1ec7u su\u1ea5t cao \u0111\u00f2i h\u1ecfi s\u1ef1 ch\u00ednh x\u00e1c. Khi m\u00f4 h\u00ecnh h\u00f3a c\u00e1c t\u01b0\u01a1ng t\u00e1c trong c\u00e1c ki\u1ebfn tr\u00fac ph\u1ea7n m\u1ec1m ph\u1ee9c t\u1ea1p, vi\u1ec7c l\u1ef1a…<\/p>\n","protected":false},"author":1,"featured_media":559,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_yoast_wpseo_title":"S\u01a1 \u0111\u1ed3 th\u1eddi gian UML so v\u1edbi s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 cho ph\u00e2n t\u00edch hi\u1ec7u su\u1ea5t","_yoast_wpseo_metadesc":"H\u1ecdc c\u00e1ch khi n\u00e0o n\u00ean chuy\u1ec3n t\u1eeb s\u01a1 \u0111\u1ed3 th\u1ee9 t\u1ef1 sang s\u01a1 \u0111\u1ed3 th\u1eddi gian \u0111\u1ec3 m\u00f4 h\u00ecnh h\u00f3a hi\u1ec7u su\u1ea5t ch\u00ednh x\u00e1c, theo d\u00f5i \u0111\u1ed9 tr\u1ec5 v\u00e0 thi\u1ebft k\u1ebf h\u1ec7 th\u1ed1ng th\u1eddi gian 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