![]() ![]() At the Unix prompt, enter: ps -u username The output will appear in a slightly different format when using sh, ksh, or bash, since the time command is not built into those shells. The percentage (29.0%) indicates the percentage of the CPU's time that the process used while it ran. The sum of the user and system times is the total CPU time of the process. The program myprog used 1.406 seconds of user time, 0.042 seconds of system time, and 4.96 seconds of real time. The following is an output example for users in the csh or tcsh shells: 1.406u 0.042s 0:04.96 29.0% 2+5k 0+1io 0pf+0w ![]() Replace myprog with the name of the program you are running. If you want to see a grand total of CPU time for a program when it finishes running, you can use the time command. In Unix, you can see CPU usage on a job that is running in a number of ways, as described below: The time command For more information about the nice command, at the Unix prompt, enter: man nice Once that is divided by the number of cores ( nproc -all), you will get the current CPU usage: top -bn2 | grep '%Cpu' | tail -1 | grep -P '(.|.If you are concerned about slowing the system down, you can use the nice command to lower your program's priority. If you want to know the total CPU usage on your system every second, you can use the id attribute (IDLE) of the top output. The 45% usage you're seeing for your application is most likely the usage on one core of the CPU, which is why you can have the sum of the numbers in the %CPU column exceed 100%. ![]()
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