CPU time - Definition. Was ist CPU time
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Was (wer) ist CPU time - definition

AMOUNT OF TIME FOR WHICH A CENTRAL PROCESSING UNIT (CPU) WAS USED FOR PROCESSING INSTRUCTIONS OF A COMPUTER PROGRAM OR OPERATING SYSTEM, AS OPPOSED TO, FOR EXAMPLE, WAITING FOR INPUT/OUTPUT (I/O) OPERATIONS OR ENTERING LOW-POWER (IDLE) MODE
CPUtime; Cputime; Process time; CPU usage; Computer time; Cpu usage; Cpu time; CPU utilization
  • top]]'s display of the CPU time of various processes on a [[Unix-like]] ([[GNU]]/[[Linux]]) system
  • CPU color time for program P1}}

CPU time         
CPU time         
CPU time (or process time) is the amount of time for which a central processing unit (CPU) was used for processing instructions of a computer program or operating system, as opposed to elapsed time, which includes for example, waiting for input/output (I/O) operations or entering low-power (idle) mode. The CPU time is measured in clock ticks or seconds.
CPU socket         
  • [[LGA 775]], a [[land grid array]] socket
PROVIDES MECHANICAL AND ELECTRICAL CONNECTIONS BETWEEN A MICROPROCESSOR AND A PRINTED CIRCUIT BOARD
List of Intel CPU slots and sockets; List of AMD CPU slots and sockets; List of CPU sockets; CPU Sockets; Micro-PGA1; AMD64 sockets; CPU Socket; CPU sockets; List of AMD CPU Slots and Sockets; Processor socket; Cpu socket; Microprocessor socket; List of Intel CPU Slots and Sockets; Intel Sockets; CPU slot; Socket 615; ΜPGA1; Micro PGA1
In computer hardware, a CPU socket or CPU slot contains one or more mechanical components providing mechanical and electrical connections between a microprocessor and a printed circuit board (PCB). This allows for placing and replacing the central processing unit (CPU) without soldering.

Wikipedia

CPU time

CPU time (or process time) is the amount of time for which a central processing unit (CPU) was used for processing instructions of a computer program or operating system, as opposed to elapsed time, which includes for example, waiting for input/output (I/O) operations or entering low-power (idle) mode. The CPU time is measured in clock ticks or seconds. Often, it is useful to measure CPU time as a percentage of the CPU's capacity, which is called the CPU usage. CPU time and CPU usage have two main uses.

The CPU time is used to quantify the overall empirical efficiency of two functionally identical algorithms. For example any sorting algorithm takes an unsorted list and returns a sorted list, and will do so in a deterministic number of steps based for a given input list. However a bubble sort and a merge sort have different running time complexity such that merge sort tends to complete in fewer steps. Without any knowledge of the workings of either algorithm a greater CPU time of bubble sort shows it is less efficient for particular input data than merge sort.

This type of measurement is especially useful when comparing like algorithms that are not trivial in complexity. In this case the wall time (actual duration elapsed) is irrelevant, the computer may execute the program slower or faster depending on real world variables such as the CPU's temperature, as well as other operating system variables, such as the process's priority.

The CPU usage is used to quantify how the processor is shared between computer programs. High CPU usage by a single program may indicate that it is highly demanding of processing power or that it may malfunction; for example, it has entered an infinite loop. CPU time allows measurement of the processing power a single program requires, eliminating interference, such as time executed waiting for input or being suspended to allow other programs to run.

In contrast, elapsed real time (or simply real time, or wall-clock time) is the time taken from the start of a computer program until the end as measured by an ordinary clock. Elapsed real time includes I/O time, any multitasking delays, and all other types of waits incurred by the program.