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                # Linux nice命令 Linux nice命令以更改過的優先序來執行程序,如果未指定程序,則會印出目前的排程優先序,內定的 adjustment 為 10,范圍為 -20(最高優先序)到 19(最低優先序)。 使用權限:所有使用者。 ### 語法 ``` nice [-n adjustment] [-adjustment] [--adjustment=adjustment] [--help] [--version] [command [arg...]] ``` **參數說明**: * -n adjustment, -adjustment, --adjustment=adjustment 皆為將該原有優先序的增加 adjustment * --help 顯示求助訊息 * --version 顯示版本資訊 ### 實例 設置程序運行時的優先級 ``` # vi & //后臺運行 [1] 15297 # nice vi & //設置默認優先級 [2] 15298 [1]+ Stopped vi # nice -n 19 vi & //設置優先級為19 [3] 15299 [2]+ Stopped nice vi # nice -n -20 vi & //設置優先級為 -20 [4] 15300 [3]+ Stopped nice -n 19 vi # ps -l //顯示進程 F S UID PID PPID C PRI NI ADDR SZ WCHAN TTY TIME CMD 4 S 0 15278 15212 0 80 0 - 1208 wait pts/2 00:00:00 bash 0 T 0 15297 15278 0 80 0 - 2687 signal pts/2 00:00:00 vi 0 T 0 15298 15278 0 90 10 - 2687 signal pts/2 00:00:00 vi 0 T 0 15299 15278 1 99 19 - 2687 signal pts/2 00:00:00 vi 4 T 0 15300 15278 3 60 -20 - 2687 signal pts/2 00:00:00 vi 4 R 0 15301 15278 0 80 0 - 625 - pts/2 00:00:00 ps [4]+ Stopped nice -n -20 vi ``` 將 ls 的優先序加 1 并執行 ``` nice -n 1 ls ``` 將 ls 的優先序加 10 并執行 ``` nice ls ``` **注意:**優先序 (priority) 為操作系統用來決定 CPU 分配的參數,Linux 使用『回合制(round-robin)』的演算法來做 CPU 排程,優先序越高,所可能獲得的 CPU時間就越多。
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