How to use the common command nice in Linux
This article mainly introduces how to use Linux common command nice, has a certain reference value, interested friends can refer to, I hope you have a lot of gains after reading this article, let Xiaobian take you to understand.
The nice command executes programs with changed priority, and if no program is specified, prints the current scheduling priority, with a default adjustment of 10, ranging from-20 (highest priority) to 19 (lowest priority).
nice [-n adjustment] [-adjustment][--adjustment=adjustment] [--help] [--version] [command [arg...]] Parameter Description:
-n adjustment, -adjustment, -adjustment=adjustment is an increase in the priority of the adjustment
- help Display help messages
- version Displays version information
Instance Sets the run-time priority of the program
# vi & //background [1] 15297 # nice vi & //set default priority [2] 15298 [1]+ Stopped vi # nice -n 19 vi & //Set priority to 19 [3] 15299 [2]+ Stopped nice vi # nice -n -20 vi & //Set priority to-20 [4] 15300 [3]+ Stopped nice -n 19 vi # ps -l //Display process 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 Increase the priority of ls by 1 and execute
nice -n 1 ls increases the priority of ls by 10 and executes
nice ls Note: Priority is a parameter used by the operating system to determine CPU allocation. Linux uses a round-robin algorithm for CPU scheduling. The higher the priority, the more CPU time it is possible to get.
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