{"id":477196,"date":"2023-08-09T09:08:44","date_gmt":"2023-08-09T09:08:44","guid":{"rendered":""},"modified":"2023-09-05T11:14:15","modified_gmt":"2023-09-05T11:14:15","slug":"fcfs","status":"publish","type":"wiki","link":"https:\/\/oneproxy.pro\/vn\/wiki\/fcfs\/","title":{"rendered":"FCFS"},"content":{"rendered":"<p>\u0110\u1ebfn tr\u01b0\u1edbc ph\u1ee5c v\u1ee5 tr\u01b0\u1edbc (FCFS) l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch c\u01a1 b\u1ea3n \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh v\u00e0 \u1ee9ng d\u1ee5ng kh\u00e1c nhau \u0111\u1ec3 qu\u1ea3n l\u00fd vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 ho\u1eb7c quy tr\u00ecnh. N\u00f3 tu\u00e2n theo nguy\u00ean t\u1eafc ph\u1ee5c v\u1ee5 t\u00e1c v\u1ee5 c\u0169 nh\u1ea5t trong h\u00e0ng \u0111\u1ee3i tr\u01b0\u1edbc, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh m\u1ed9t trong nh\u1eefng ph\u01b0\u01a1ng ph\u00e1p l\u1eadp l\u1ecbch \u0111\u01a1n gi\u1ea3n v\u00e0 tr\u1ef1c quan nh\u1ea5t. FCFS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng r\u1ed9ng r\u00e3i trong c\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh, qu\u1ea3n l\u00fd t\u00e1c v\u1ee5 v\u00e0 ph\u00e2n b\u1ed5 t\u00e0i nguy\u00ean, bao g\u1ed3m c\u1ea3 s\u1ef1 li\u00ean quan c\u1ee7a n\u00f3 v\u1edbi th\u1ebf gi\u1edbi m\u00e1y ch\u1ee7 proxy. B\u00e0i vi\u1ebft n\u00e0y cung c\u1ea5p c\u00e1i nh\u00ecn to\u00e0n di\u1ec7n v\u1ec1 FCFS, l\u1ecbch s\u1eed, c\u1ea5u tr\u00fac b\u00ean trong, c\u00e1c t\u00ednh n\u0103ng ch\u00ednh, lo\u1ea1i, tr\u01b0\u1eddng h\u1ee3p s\u1eed d\u1ee5ng v\u00e0 k\u1ebft n\u1ed1i c\u1ee7a n\u00f3 v\u1edbi c\u00e1c nh\u00e0 cung c\u1ea5p m\u00e1y ch\u1ee7 proxy nh\u01b0 OneProxy.<\/p>\n<h2>L\u1ecbch s\u1eed ngu\u1ed3n g\u1ed1c c\u1ee7a FCFS v\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean \u0111\u1ec1 c\u1eadp \u0111\u1ebfn n\u00f3<\/h2>\n<p>Ngu\u1ed3n g\u1ed1c c\u1ee7a FCFS c\u00f3 th\u1ec3 b\u1eaft ngu\u1ed3n t\u1eeb nh\u1eefng ng\u00e0y \u0111\u1ea7u ph\u00e1t tri\u1ec3n h\u1ec7 th\u1ed1ng m\u00e1y t\u00ednh v\u00e0 h\u1ec7 \u0111i\u1ec1u h\u00e0nh. M\u1eb7c d\u00f9 kh\u00f4ng c\u00f3 ng\u00e0y th\u00e1ng ho\u1eb7c ng\u01b0\u1eddi c\u1ee5 th\u1ec3 li\u00ean quan \u0111\u1ebfn s\u1ef1 ra \u0111\u1eddi c\u1ee7a n\u00f3, nh\u01b0ng kh\u00e1i ni\u1ec7m ph\u1ee5c v\u1ee5 c\u00e1c nhi\u1ec7m v\u1ee5 theo th\u1ee9 t\u1ef1 ch\u00fang \u0111\u1ebfn c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c nh\u00ecn th\u1ea5y trong c\u00e1c h\u1ec7 th\u1ed1ng x\u1eed l\u00fd th\u1ee7 c\u00f4ng ban \u0111\u1ea7u. Khi m\u00e1y t\u00ednh ph\u00e1t tri\u1ec3n v\u00e0 tr\u1edf n\u00ean t\u1ef1 \u0111\u1ed9ng h\u01a1n, nhu c\u1ea7u v\u1ec1 thu\u1eadt to\u00e1n l\u1eadp k\u1ebf ho\u1ea1ch ch\u00ednh th\u1ee9c n\u1ea3y sinh.<\/p>\n<p>M\u1ed9t trong nh\u1eefng \u0111\u1ec1 c\u1eadp s\u1edbm nh\u1ea5t v\u1ec1 FCFS c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u00ecm th\u1ea5y trong b\u1ed1i c\u1ea3nh c\u00e1c h\u1ec7 th\u1ed1ng x\u1eed l\u00fd h\u00e0ng lo\u1ea1t v\u00e0o nh\u1eefng n\u0103m 1950 v\u00e0 1960. Trong c\u00e1c h\u1ec7 th\u1ed1ng n\u00e0y, c\u00f4ng vi\u1ec7c \u0111\u01b0\u1ee3c g\u1eedi t\u1edbi m\u00e1y t\u00ednh theo \u0111\u1ee3t v\u00e0 c\u00e1c nhi\u1ec7m v\u1ee5 trong m\u1ed7i \u0111\u1ee3t \u0111\u01b0\u1ee3c x\u1eed l\u00fd tu\u1ea7n t\u1ef1 d\u1ef1a tr\u00ean th\u1ee9 t\u1ef1 g\u1eedi. C\u00e1ch ti\u1ebfp c\u1eadn n\u00e0y d\u1ec5 th\u1ef1c hi\u1ec7n v\u00e0 d\u1ec5 hi\u1ec3u nh\u01b0ng c\u0169ng c\u00f3 nh\u1eefng h\u1ea1n ch\u1ebf, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi x\u1eed l\u00fd c\u00e1c t\u00e1c v\u1ee5 k\u00e9o d\u00e0i ho\u1eb7c nh\u1ea1y c\u1ea3m v\u1ec1 th\u1eddi gian.<\/p>\n<h2>Th\u00f4ng tin chi ti\u1ebft v\u1ec1 FCFS. M\u1edf r\u1ed9ng ch\u1ee7 \u0111\u1ec1 FCFS.<\/h2>\n<p>FCFS l\u00e0 m\u1ed9t thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch kh\u00f4ng \u01b0u ti\u00ean, ngh\u0129a l\u00e0 khi m\u1ed9t t\u00e1c v\u1ee5 \u0111\u01b0\u1ee3c giao cho CPU (B\u1ed9 x\u1eed l\u00fd trung t\u00e2m) th\u1ef1c thi, n\u00f3 s\u1ebd ti\u1ebfp t\u1ee5c ch\u1ea1y cho \u0111\u1ebfn khi ho\u00e0n th\u00e0nh ho\u1eb7c n\u00f3 t\u1ef1 nguy\u1ec7n t\u1eeb b\u1ecf CPU. N\u00f3 kh\u00f4ng l\u00e0m gi\u00e1n \u0111o\u1ea1n c\u00e1c nhi\u1ec7m v\u1ee5 trong qu\u00e1 tr\u00ecnh th\u1ef1c thi, l\u00e0m cho n\u00f3 ph\u00f9 h\u1ee3p v\u1edbi c\u00e1c t\u00ecnh hu\u1ed1ng kh\u00f4ng c\u1ea7n ph\u1ea3i c\u00f3 quy\u1ec1n \u01b0u ti\u00ean th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5.<\/p>\n<p>C\u1ea5u tr\u00fac d\u1eef li\u1ec7u ch\u00ednh \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong FCFS l\u00e0 m\u1ed9t h\u00e0ng \u0111\u1ee3i, trong \u0111\u00f3 c\u00e1c t\u00e1c v\u1ee5 \u0111\u01b0\u1ee3c nh\u1eadp \u1edf ph\u00eda sau v\u00e0 tho\u00e1t ra t\u1eeb ph\u00eda tr\u01b0\u1edbc. Khi c\u00e1c t\u00e1c v\u1ee5 m\u1edbi \u0111\u1ebfn, ch\u00fang s\u1ebd \u0111\u01b0\u1ee3c x\u1ebfp \u1edf cu\u1ed1i h\u00e0ng \u0111\u1ee3i v\u00e0 t\u00e1c v\u1ee5 \u1edf \u0111\u1ea7u h\u00e0ng \u0111\u1ee3i s\u1ebd \u0111\u01b0\u1ee3c CPU ph\u1ee5c v\u1ee5. Khi m\u1ed9t t\u00e1c v\u1ee5 ho\u00e0n th\u00e0nh vi\u1ec7c th\u1ef1c thi, n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c x\u1ebfp h\u00e0ng \u0111\u1ee3i t\u1eeb ph\u00eda tr\u01b0\u1edbc v\u00e0 t\u00e1c v\u1ee5 ti\u1ebfp theo trong d\u00f2ng s\u1ebd tr\u1edf th\u00e0nh t\u00e1c v\u1ee5 hi\u1ec7n t\u1ea1i.<\/p>\n<p>FCFS c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn \u201chi\u1ec7u \u1ee9ng \u0111o\u00e0n xe\u201d, trong \u0111\u00f3 m\u1ed9t t\u00e1c v\u1ee5 ch\u1ea1y d\u00e0i c\u00f3 th\u1ec3 tr\u00ec ho\u00e3n vi\u1ec7c th\u1ef1c hi\u1ec7n c\u00e1c t\u00e1c v\u1ee5 ti\u1ebfp theo ngay c\u1ea3 khi ch\u00fang ng\u1eafn. Hi\u1ec7n t\u01b0\u1ee3ng n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c s\u1eed d\u1ee5ng t\u00e0i nguy\u00ean k\u00e9m v\u00e0 t\u0103ng th\u1eddi gian ch\u1edd \u0111\u1ee3i trung b\u00ecnh cho c\u00e1c t\u00e1c v\u1ee5.<\/p>\n<h2>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a FCFS. FCFS ho\u1ea1t \u0111\u1ed9ng nh\u01b0 th\u1ebf n\u00e0o<\/h2>\n<p>C\u1ea5u tr\u00fac b\u00ean trong c\u1ee7a FCFS xoay quanh c\u1ea5u tr\u00fac d\u1eef li\u1ec7u h\u00e0ng \u0111\u1ee3i \u0111\u01a1n gi\u1ea3n. B\u1ea5t c\u1ee9 khi n\u00e0o m\u1ed9t t\u00e1c v\u1ee5 m\u1edbi \u0111\u01b0\u1ee3c g\u1eedi, n\u00f3 s\u1ebd \u0111\u01b0\u1ee3c th\u00eam v\u00e0o cu\u1ed1i h\u00e0ng \u0111\u1ee3i v\u00e0 CPU s\u1ebd th\u1ef1c thi t\u00e1c v\u1ee5 \u1edf ph\u00eda tr\u01b0\u1edbc h\u00e0ng \u0111\u1ee3i. Qu\u00e1 tr\u00ecnh l\u1eb7p l\u1ea1i cho \u0111\u1ebfn khi t\u1ea5t c\u1ea3 c\u00e1c nhi\u1ec7m v\u1ee5 \u0111\u01b0\u1ee3c ho\u00e0n th\u00e0nh.<\/p>\n<p>Bi\u1ec3u di\u1ec5n m\u00e3 gi\u1ea3 c\u1ee7a thu\u1eadt to\u00e1n FCFS:<\/p>\n<pre><div class=\"bg-black rounded-md mb-4\"><div class=\"flex items-center relative text-gray-200 bg-gray-800 px-4 py-2 text-xs font-sans justify-between rounded-t-md\"><span>sql<\/span><button class=\"flex ml-auto gap-2\"><svg stroke=\"currentColor\" fill=\"none\" stroke-width=\"2\" viewbox=\"0 0 24 24\" stroke-linecap=\"round\" stroke-linejoin=\"round\" class=\"h-4 w-4\" height=\"1em\" width=\"1em\" ><path d=\"M16 4h2a2 2 0 0 1 2 2v14a2 2 0 0 1-2 2H6a2 2 0 0 1-2-2V6a2 2 0 0 1 2-2h2\"><\/path><rect x=\"8\" y=\"2\" width=\"8\" height=\"4\" rx=\"1\" ry=\"1\"><\/rect><\/svg>Sao ch\u00e9p m\u00e3<\/button><\/div><div class=\"p-4 overflow-y-auto\"><code class=\"!whitespace-pre hljs language-sql\" data-no-translation=\"\"><span class=\"hljs-keyword\">function<\/span> FCFS_Schedule(tasks):\n    <span class=\"hljs-keyword\">create<\/span> an <span class=\"hljs-keyword\">empty<\/span> queue\n    <span class=\"hljs-keyword\">for<\/span> <span class=\"hljs-keyword\">each<\/span> task <span class=\"hljs-keyword\">in<\/span> tasks:\n        enqueue task <span class=\"hljs-keyword\">into<\/span> the queue\n    while the queue <span class=\"hljs-keyword\">is<\/span> <span class=\"hljs-keyword\">not<\/span> <span class=\"hljs-keyword\">empty<\/span>:\n        current_task <span class=\"hljs-operator\">=<\/span> dequeue the front task <span class=\"hljs-keyword\">from<\/span> the queue\n        <span class=\"hljs-keyword\">execute<\/span> current_task\n<\/code><\/div><\/div><\/pre>\n<h2>Ph\u00e2n t\u00edch c\u00e1c t\u00ednh n\u0103ng ch\u00ednh c\u1ee7a FCFS.<\/h2>\n<p>FCFS s\u1edf h\u1eefu m\u1ed9t s\u1ed1 t\u00ednh n\u0103ng ch\u00ednh, bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>S\u1ef1 \u0111\u01a1n gi\u1ea3n:<\/strong> FCFS d\u1ec5 th\u1ef1c hi\u1ec7n v\u00e0 d\u1ec5 hi\u1ec3u, khi\u1ebfn n\u00f3 tr\u1edf th\u00e0nh l\u1ef1a ch\u1ecdn ph\u1ed5 bi\u1ebfn cho c\u00e1c h\u1ec7 th\u1ed1ng \u0111\u01a1n gi\u1ea3n ho\u1eb7c l\u00e0 \u0111i\u1ec3m kh\u1edfi \u0111\u1ea7u cho c\u00e1c thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch ph\u1ee9c t\u1ea1p h\u01a1n.<\/p>\n<\/li>\n<li>\n<p><strong>Kh\u00f4ng \u01b0u ti\u00ean:<\/strong> FCFS kh\u00f4ng \u01b0u ti\u00ean c\u00e1c t\u00e1c v\u1ee5 \u0111ang ch\u1ea1y, \u0111\u1ea3m b\u1ea3o r\u1eb1ng khi m\u1ed9t t\u00e1c v\u1ee5 b\u1eaft \u0111\u1ea7u th\u1ef1c thi, n\u00f3 s\u1ebd ti\u1ebfp t\u1ee5c cho \u0111\u1ebfn khi ho\u00e0n th\u00e0nh ho\u1eb7c cho \u0111\u1ebfn khi n\u00f3 t\u1ef1 nguy\u1ec7n t\u1eeb b\u1ecf CPU.<\/p>\n<\/li>\n<li>\n<p><strong>C\u00f4ng b\u1eb1ng:<\/strong> V\u00ec FCFS tu\u00e2n theo nguy\u00ean t\u1eafc \u201c\u0111\u1ebfn tr\u01b0\u1edbc, ph\u1ee5c v\u1ee5 tr\u01b0\u1edbc\u201d n\u00ean \u0111\u1ea3m b\u1ea3o s\u1ef1 c\u00f4ng b\u1eb1ng trong th\u1ee9 t\u1ef1 th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5. C\u00e1c nhi\u1ec7m v\u1ee5 \u0111\u01b0\u1ee3c th\u1ef1c hi\u1ec7n theo th\u1ee9 t\u1ef1 ch\u00fang \u0111\u1ebfn m\u00e0 kh\u00f4ng c\u00f3 b\u1ea5t k\u1ef3 s\u1ef1 ph\u00e2n bi\u1ec7t \u01b0u ti\u00ean n\u00e0o.<\/p>\n<\/li>\n<li>\n<p><strong>Th\u1eddi gian quay v\u00f2ng cao cho c\u00e1c nhi\u1ec7m v\u1ee5 d\u00e0i:<\/strong> Hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn th\u1eddi gian ho\u00e0n th\u00e0nh l\u00e2u h\u01a1n cho c\u00e1c t\u00e1c v\u1ee5 d\u00e0i, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn hi\u1ec7u su\u1ea5t t\u1ed5ng th\u1ec3 c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1c lo\u1ea1i FCFS<\/h2>\n<p>Ch\u1ec9 c\u00f3 m\u1ed9t bi\u1ebfn th\u1ec3 c\u1ee7a l\u1eadp l\u1ecbch FCFS v\u00e0 \u0111\u00f3 l\u00e0 d\u1ea1ng c\u01a1 b\u1ea3n, kh\u00f4ng \u0111\u01b0\u1ee3c \u01b0u ti\u00ean \u0111\u00e3 m\u00f4 t\u1ea3 tr\u01b0\u1edbc \u0111\u00f3. Tuy nhi\u00ean, c\u00f3 th\u1ec3 th\u1ea5y c\u00e1c bi\u1ebfn th\u1ec3 c\u1ee7a FCFS khi k\u1ebft h\u1ee3p v\u1edbi c\u00e1c ch\u00ednh s\u00e1ch l\u1eadp l\u1ecbch kh\u00e1c, ch\u1eb3ng h\u1ea1n nh\u01b0 l\u1eadp l\u1ecbch d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean. Trong FCFS d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean, c\u00e1c nhi\u1ec7m v\u1ee5 c\u00f3 c\u00f9ng m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean \u0111\u01b0\u1ee3c ph\u00e2n ph\u00e1t theo th\u1ee9 t\u1ef1 FCFS, trong khi c\u00e1c nhi\u1ec7m v\u1ee5 c\u00f3 m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean kh\u00e1c nhau \u0111\u01b0\u1ee3c th\u1ef1c thi d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean c\u1ee7a ch\u00fang.<\/p>\n<p>D\u01b0\u1edbi \u0111\u00e2y l\u00e0 b\u1ea3ng so s\u00e1nh FCFS c\u01a1 b\u1ea3n v\u00e0 FCFS d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean:<\/p>\n<table>\n<thead>\n<tr>\n<th>FCFS<\/th>\n<th>FCFS d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kh\u00f4ng \u01b0u ti\u00ean<\/td>\n<td>Kh\u00f4ng \u01b0u ti\u00ean<\/td>\n<\/tr>\n<tr>\n<td>M\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean ngang nhau<\/td>\n<td>\u01afu ti\u00ean kh\u00e1c nhau<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u01a1n gi\u1ea3n<\/td>\n<td>\u0110\u01a1n gi\u1ea3n<\/td>\n<\/tr>\n<tr>\n<td>Hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe<\/td>\n<td>Hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>C\u00e1c c\u00e1ch s\u1eed d\u1ee5ng FCFS, 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<p>FCFS t\u00ecm th\u1ea5y \u1ee9ng d\u1ee5ng trong nhi\u1ec1u l\u0129nh v\u1ef1c kh\u00e1c nhau, bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>C\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh:<\/strong> Trong c\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh \u0111\u1ea7u ti\u00ean, FCFS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 l\u00ean l\u1ecbch c\u00e1c t\u00e1c v\u1ee5 trong c\u00e1c h\u1ec7 th\u1ed1ng x\u1eed l\u00fd h\u00e0ng lo\u1ea1t. Tuy nhi\u00ean, c\u00e1c h\u1ec7 \u0111i\u1ec1u h\u00e0nh hi\u1ec7n \u0111\u1ea1i s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch n\u00e2ng cao h\u01a1n \u0111\u1ec3 c\u00f3 hi\u1ec7u su\u1ea5t t\u1ed1t h\u01a1n.<\/p>\n<\/li>\n<li>\n<p><strong>Qu\u1ea3n l\u00fd t\u00e1c v\u1ee5:<\/strong> FCFS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong h\u00e0ng \u0111\u1ee3i nhi\u1ec7m v\u1ee5, trong \u0111\u00f3 c\u00e1c nhi\u1ec7m v\u1ee5 \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo th\u1ee9 t\u1ef1 ch\u00fang \u0111\u01b0\u1ee3c th\u00eam v\u00e0o.<\/p>\n<\/li>\n<li>\n<p><strong>Ph\u00e2n b\u1ed5 ngu\u1ed3n l\u1ef1c:<\/strong> FCFS \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng trong c\u00e1c t\u00ecnh hu\u1ed1ng trong \u0111\u00f3 vi\u1ec7c ph\u00e2n ph\u1ed1i t\u00e0i nguy\u00ean m\u1ed9t c\u00e1ch c\u00f4ng b\u1eb1ng l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft v\u00ec n\u00f3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c nhi\u1ec7m v\u1ee5 \u0111\u01b0\u1ee3c th\u1ef1c thi m\u00e0 kh\u00f4ng c\u00f3 sai l\u1ec7ch v\u1ec1 m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean.<\/p>\n<\/li>\n<\/ol>\n<h3>V\u1ea5n \u0111\u1ec1 v\u00e0 gi\u1ea3i ph\u00e1p:<\/h3>\n<ol>\n<li>\n<p><strong>Hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe:<\/strong> Nh\u01b0 \u0111\u00e3 \u0111\u1ec1 c\u1eadp tr\u01b0\u1edbc \u0111\u00f3, FCFS c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe, g\u00e2y ra s\u1ef1 ch\u1eadm tr\u1ec5 cho c\u00e1c nhi\u1ec7m v\u1ee5 ng\u1eafn. M\u1ed9t gi\u1ea3i ph\u00e1p cho v\u1ea5n \u0111\u1ec1 n\u00e0y l\u00e0 s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n l\u1eadp k\u1ebf ho\u1ea1ch n\u00e2ng cao h\u01a1n \u0111\u1ec3 xem x\u00e9t m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean c\u1ee7a nhi\u1ec7m v\u1ee5 ho\u1eb7c th\u1eddi gian th\u1ef1c hi\u1ec7n.<\/p>\n<\/li>\n<li>\n<p><strong>Can thi\u1ec7p c\u00f4ng vi\u1ec7c l\u00e2u d\u00e0i:<\/strong> C\u00e1c t\u00e1c v\u1ee5 ch\u1ea1y d\u00e0i c\u00f3 th\u1ec3 chi\u1ebfm \u0111\u1ed9c quy\u1ec1n c\u1ee7a CPU, \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn kh\u1ea3 n\u0103ng ph\u1ea3n h\u1ed3i chung c\u1ee7a h\u1ec7 th\u1ed1ng. V\u1ea5n \u0111\u1ec1 n\u00e0y c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c gi\u1ea3m thi\u1ec3u b\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng quy\u1ec1n \u01b0u ti\u00ean th\u1ef1c hi\u1ec7n nhi\u1ec7m v\u1ee5 ho\u1eb7c s\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt chia s\u1ebb th\u1eddi gian.<\/p>\n<\/li>\n<\/ol>\n<h2>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<p>\u0110\u00e2y l\u00e0 so s\u00e1nh FCFS v\u1edbi c\u00e1c thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch kh\u00e1c:<\/p>\n<table>\n<thead>\n<tr>\n<th>FCFS<\/th>\n<th>V\u00f2ng Robin<\/th>\n<th>C\u00f4ng vi\u1ec7c ng\u1eafn nh\u1ea5t \u0111\u1ea7u ti\u00ean (SJF)<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>Kh\u00f4ng \u01b0u ti\u00ean<\/td>\n<td>\u01afu ti\u00ean<\/td>\n<td>Kh\u00f4ng \u01b0u ti\u00ean<\/td>\n<\/tr>\n<tr>\n<td>\u0110\u01a1n gi\u1ea3n<\/td>\n<td>T\u01b0\u01a1ng \u0111\u1ed1i \u0111\u01a1n gi\u1ea3n<\/td>\n<td>T\u1ed5 h\u1ee3p<\/td>\n<\/tr>\n<tr>\n<td>Hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe<\/td>\n<td>Tr\u00e1nh hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe<\/td>\n<td>Tr\u00e1nh hi\u1ec7u \u1ee9ng \u0111o\u00e0n xe<\/td>\n<\/tr>\n<tr>\n<td>Kh\u00f4ng t\u1ed1i \u01b0u h\u00f3a<\/td>\n<td>T\u1ed1i \u01b0u h\u00f3a l\u01b0\u1ee3ng t\u1eed th\u1eddi gian<\/td>\n<td>T\u1ed1i \u01b0u cho th\u1eddi gian trung b\u00ecnh<\/td>\n<\/tr>\n<tr>\n<td>Th\u1ef1c thi c\u00f4ng b\u1eb1ng<\/td>\n<td>K\u1ef9 thu\u1eadt chia s\u1ebb th\u1eddi gian<\/td>\n<td>C\u00f3 th\u1ec3 g\u00e2y \u0111\u00f3i<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h2>Quan \u0111i\u1ec3m v\u00e0 c\u00f4ng ngh\u1ec7 c\u1ee7a t\u01b0\u01a1ng lai li\u00ean quan \u0111\u1ebfn FCFS.<\/h2>\n<p>Khi c\u00e1c h\u1ec7 th\u1ed1ng v\u00e0 \u1ee9ng d\u1ee5ng m\u00e1y t\u00ednh ph\u00e1t tri\u1ec3n, c\u00e1c thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch ph\u1ee9c t\u1ea1p h\u01a1n \u0111\u00e3 \u0111\u01b0\u1ee3c ph\u00e1t tri\u1ec3n \u0111\u1ec3 gi\u1ea3i quy\u1ebft c\u00e1c h\u1ea1n ch\u1ebf c\u1ee7a FCFS v\u00e0 c\u00e1c thu\u1eadt to\u00e1n c\u01a1 b\u1ea3n kh\u00e1c. Nh\u1eefng ti\u1ebfn b\u1ed9 n\u00e0y bao g\u1ed3m:<\/p>\n<ol>\n<li>\n<p><strong>L\u1eadp l\u1ecbch x\u1ebfp h\u00e0ng \u0111a c\u1ea5p:<\/strong> Chia nhi\u1ec7m v\u1ee5 th\u00e0nh c\u00e1c h\u00e0ng \u0111\u1ee3i ri\u00eang bi\u1ec7t d\u1ef1a tr\u00ean m\u1ee9c \u0111\u1ed9 \u01b0u ti\u00ean, cho ph\u00e9p s\u1eed d\u1ee5ng c\u00e1c thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch kh\u00e1c nhau cho m\u1ed7i h\u00e0ng \u0111\u1ee3i.<\/p>\n<\/li>\n<li>\n<p><strong>L\u1eadp k\u1ebf ho\u1ea1ch h\u00e0ng \u0111\u1ee3i ph\u1ea3n h\u1ed3i \u0111a c\u1ea5p:<\/strong> Cho ph\u00e9p c\u00e1c t\u00e1c v\u1ee5 di chuy\u1ec3n gi\u1eefa c\u00e1c h\u00e0ng \u0111\u1ee3i kh\u00e1c nhau d\u1ef1a tr\u00ean h\u00e0nh vi c\u1ee7a ch\u00fang, th\u00edch \u1ee9ng v\u1edbi nh\u1eefng thay \u0111\u1ed5i \u0111\u1ed9ng c\u1ee7a kh\u1ed1i l\u01b0\u1ee3ng c\u00f4ng vi\u1ec7c.<\/p>\n<\/li>\n<li>\n<p><strong>L\u1eadp k\u1ebf ho\u1ea1ch theo th\u1eddi gian th\u1ef1c:<\/strong> C\u00e1c thu\u1eadt to\u00e1n l\u1eadp k\u1ebf ho\u1ea1ch \u0111\u01b0\u1ee3c thi\u1ebft k\u1ebf \u0111\u1ec3 \u0111\u00e1p \u1ee9ng c\u00e1c r\u00e0ng bu\u1ed9c nghi\u00eam ng\u1eb7t v\u1ec1 th\u1eddi gian, r\u1ea5t quan tr\u1ecdng trong c\u00e1c \u1ee9ng d\u1ee5ng th\u1eddi gian th\u1ef1c.<\/p>\n<\/li>\n<li>\n<p><strong>L\u1eadp k\u1ebf ho\u1ea1ch d\u1ef1a tr\u00ean Machine Learning:<\/strong> S\u1eed d\u1ee5ng c\u00e1c k\u1ef9 thu\u1eadt h\u1ecdc m\u00e1y \u0111\u1ec3 t\u1ed1i \u01b0u h\u00f3a vi\u1ec7c l\u1eadp l\u1ecbch t\u00e1c v\u1ee5 d\u1ef1a tr\u00ean d\u1eef li\u1ec7u l\u1ecbch s\u1eed v\u00e0 h\u00e0nh vi c\u1ee7a h\u1ec7 th\u1ed1ng.<\/p>\n<\/li>\n<\/ol>\n<h2>C\u00e1ch s\u1eed d\u1ee5ng ho\u1eb7c li\u00ean k\u1ebft m\u00e1y ch\u1ee7 proxy v\u1edbi FCFS.<\/h2>\n<p>M\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 h\u01b0\u1edfng l\u1ee3i t\u1eeb FCFS theo nhi\u1ec1u c\u00e1ch kh\u00e1c nhau, \u0111\u1eb7c bi\u1ec7t l\u00e0 khi x\u1eed l\u00fd c\u00e1c y\u00eau c\u1ea7u c\u1ee7a m\u00e1y kh\u00e1ch. B\u1eb1ng c\u00e1ch s\u1eed d\u1ee5ng FCFS l\u00e0m thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch cho c\u00e1c y\u00eau c\u1ea7u m\u00e1y kh\u00e1ch \u0111\u1ebfn, m\u00e1y ch\u1ee7 proxy c\u00f3 th\u1ec3 \u0111\u1ea3m b\u1ea3o r\u1eb1ng c\u00e1c y\u00eau c\u1ea7u \u0111\u01b0\u1ee3c x\u1eed l\u00fd theo th\u1ee9 t\u1ef1 ch\u00fang \u0111\u1ebfn, mang l\u1ea1i s\u1ef1 \u0111\u1ed1i x\u1eed c\u00f4ng b\u1eb1ng cho t\u1ea5t c\u1ea3 m\u00e1y kh\u00e1ch. \u0110i\u1ec1u n\u00e0y gi\u00fap ng\u0103n ch\u1eb7n b\u1ea5t k\u1ef3 m\u00e1y kh\u00e1ch n\u00e0o \u0111\u1ed9c quy\u1ec1n t\u00e0i nguy\u00ean m\u00e1y ch\u1ee7 v\u00e0 \u0111\u1ea3m b\u1ea3o ph\u00e2n b\u1ed5 c\u00e2n b\u1eb1ng s\u1ee9c m\u1ea1nh x\u1eed l\u00fd gi\u1eefa c\u00e1c m\u00e1y kh\u00e1ch.<\/p>\n<h2>Li\u00ean k\u1ebft li\u00ean quan<\/h2>\n<p>\u0110\u1ec3 bi\u1ebft th\u00eam th\u00f4ng tin v\u1ec1 FCFS v\u00e0 c\u00e1c thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch, h\u00e3y tham kh\u1ea3o c\u00e1c t\u00e0i nguy\u00ean sau:<\/p>\n<ol>\n<li><a href=\"https:\/\/www.os-book.com\/OS10\/slide-dir\/index.html#slides\/sched-1\/sld024.htm\" target=\"_new\" rel=\"noopener nofollow\">Kh\u00e1i ni\u1ec7m h\u1ec7 \u0111i\u1ec1u h\u00e0nh \u2013 L\u1eadp k\u1ebf ho\u1ea1ch FCFS<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Multilevel_feedback_queue\" target=\"_new\" rel=\"noopener nofollow\">L\u1eadp k\u1ebf ho\u1ea1ch h\u00e0ng \u0111\u1ee3i ph\u1ea3n h\u1ed3i \u0111a c\u1ea5p<\/a><\/li>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Real-time_scheduling\" target=\"_new\" rel=\"noopener nofollow\">L\u1eadp k\u1ebf ho\u1ea1ch th\u1eddi gian th\u1ef1c<\/a><\/li>\n<li><a href=\"https:\/\/ieeexplore.ieee.org\/abstract\/document\/9150162\" target=\"_new\" rel=\"noopener nofollow\">H\u1ecdc m\u00e1y \u0111\u1ec3 l\u1eadp l\u1ecbch t\u00e1c v\u1ee5<\/a><\/li>\n<\/ol>\n<p>Khi c\u00f4ng ngh\u1ec7 ti\u1ebfp t\u1ee5c ph\u00e1t tri\u1ec3n, c\u00e1c thu\u1eadt to\u00e1n l\u1eadp l\u1ecbch s\u1ebd v\u1eabn l\u00e0 m\u1ed9t kh\u00eda c\u1ea1nh quan tr\u1ecdng trong vi\u1ec7c t\u1ed1i \u01b0u h\u00f3a hi\u1ec7u su\u1ea5t h\u1ec7 th\u1ed1ng v\u00e0 ph\u00e2n b\u1ed5 ngu\u1ed3n l\u1ef1c. FCFS, v\u1edbi t\u00ednh \u0111\u01a1n gi\u1ea3n v\u00e0 c\u00f4ng b\u1eb1ng c\u1ee7a n\u00f3, s\u1ebd ti\u1ebfp t\u1ee5c ph\u00f9 h\u1ee3p trong c\u00e1c l\u0129nh v\u1ef1c \u0111i\u1ec7n to\u00e1n kh\u00e1c nhau, bao g\u1ed3m qu\u1ea3n l\u00fd m\u00e1y ch\u1ee7 proxy v\u00e0 h\u01a1n th\u1ebf n\u1eefa.<\/p>","protected":false},"featured_media":477197,"menu_order":0,"template":"","meta":{"_acf_changed":false,"content-type":"","inline_featured_image":false,"footnotes":""},"class_list":["post-477196","wiki","type-wiki","status-publish","has-post-thumbnail","hentry"],"acf":{"faq_title":"Frequently Asked Questions about <mark>FCFS (First-Come, First-Serve) Scheduling: An In-depth Guide<\/mark>","faq_items":[{"question":"What is FCFS (First-Come, First-Serve) Scheduling?","answer":"<p>FCFS (First-Come, First-Serve) Scheduling is a fundamental task scheduling algorithm used in computer systems and applications. It serves tasks in the order they arrive, following a simple \"first-come, first-serve\" principle.<\/p>"},{"question":"What is the history of FCFS?","answer":"<p>The origins of FCFS can be traced back to the early days of computer systems. While there is no specific date or person associated with its inception, it was used in batch processing systems in the 1950s and 1960s. These systems processed tasks in the order of submission, forming the basis of FCFS.<\/p>"},{"question":"How does FCFS work internally?","answer":"<p>FCFS utilizes a queue data structure. As tasks arrive, they are added to the back of the queue. The CPU executes the task at the front of the queue. Once a task is completed, it is removed from the front, and the next task in line gets processed.<\/p>"},{"question":"What are the key features of FCFS?","answer":"<p>FCFS is simple, non-preemptive, and fair. It is easy to implement and understand, does not interrupt running tasks, and ensures equal treatment for all tasks in the queue.<\/p>"},{"question":"Are there different types of FCFS?","answer":"<p>While there is only one basic FCFS scheduling algorithm, variations can be seen when combined with other policies. For example, in priority-based FCFS, tasks with the same priority are served in FCFS order, while tasks with different priorities follow their priority levels.<\/p>"},{"question":"What are the uses of FCFS?","answer":"<p>FCFS finds applications in operating systems, task management, and resource allocation. It ensures fair distribution of resources and is useful in scenarios where task preemption is not required.<\/p>"},{"question":"What are the common issues with FCFS?","answer":"<p>FCFS can lead to the \"convoy effect,\" where long-running tasks delay shorter ones. To address this, more advanced scheduling algorithms can be used that consider task priorities or execution times.<\/p>"},{"question":"How does FCFS compare to other scheduling algorithms?","answer":"<p>Compared to Round Robin and Shortest Job First (SJF) algorithms, FCFS is non-preemptive, simple, and ensures fair execution. However, it may not be optimized for average time compared to SJF.<\/p>"},{"question":"How does FCFS relate to proxy servers?","answer":"<p>FCFS can be employed in proxy servers to process client requests in the order they arrive, ensuring fair treatment and resource allocation among clients.<\/p>"},{"question":"What does the future hold for FCFS and related technologies?","answer":"<p>As technology evolves, more advanced scheduling algorithms, like multilevel queue and real-time scheduling, will continue to be developed. Machine learning-based scheduling may also play a significant role in optimizing task scheduling in the future.<\/p>"}]},"_links":{"self":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/wiki\/477196","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\/477196\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media\/477197"}],"wp:attachment":[{"href":"https:\/\/oneproxy.pro\/vn\/wp-json\/wp\/v2\/media?parent=477196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}