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The total CPU time is the combination of the amount of time the CPU or CPUs spent performing some action for a program and the amount of time they spent performing system calls for the kernel on the program's behalf. When a program loops through an array, it is accumulating user CPU time.
TIME+: The total CPU time the task has used since it started. This is shown in minutes:seconds. The plus sign in TIME+ means that it is accurate to 0.01 second. If it shows TIME then it is accurate to 1 second. COMMAND: The command line argument that started the process. Unlike USER, if the command is too long, it is cut-off without a + at the end.
Ubuntu 22.04 LTS Desktop uses Linux kernel 5.17 for newer hardware and a rolling HWE (hardware enablement) kernel based on version 5.15 for other hardware; Ubuntu 22.04 LTS Server uses version 5.15, while Ubuntu Cloud and Ubuntu for IoT use an optimized kernel based on version 5.15. It updates Python to 3.10 and Ruby to 3.0. [274]
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sar [-flags] [ -e time ] [ -f filename ] [-i sec ] [ -s time ] -f filename Uses filename as the data source for sar. The default is the current daily data file /var/adm/sa/sadd.-e time Selects data up to time. The default is 18:00.-i sec Selects data at intervals as close as possible to sec seconds.
Sometimes it is useful to convert CPU time into a percentage of the CPU capacity, giving the CPU usage. Measuring CPU time for two functionally identical programs that process identical inputs can indicate which program is faster, but it is a common misunderstanding that CPU time can be used to compare algorithms .
Usage of Last Branch Records, [7] a branch tracing implementation available in Intel CPUs since Pentium 4, is available as a patch. [6] Since version 3.14 of the Linux kernel mainline, released on March 31, 2014, perf also supports running average power limit (RAPL) for power consumption measurements, which is available as a feature of certain ...
CPU usage and scheduling information COMMAND* Name of the process, including arguments, if any NI: nice value F: Flags PID: Process ID number PPID: ID number of the process's parent process PRI: Priority of the process RSS: Resident set size: S or STAT: Process status code START or STIME: Time when the process started VSZ: Virtual memory usage TIME