CPU time (or CPU usage, process time) is the amount of time for which a central processing unit (CPU) was used for processing instructions of a computer program, as opposed to, for example, waiting for input/output (I/O) operations.
The CPU time is often measured in clock ticks or seconds. CPU time is also mentioned as percentage of the CPU's capacity at any given time on multi-tasking environment. That helps in figuring out how a CPU’s computational power is being shared among multiple computer programs.
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 and all other types of waits incurred by the program.
Read more about CPU Time: Total CPU Time, CPU Time and Elapsed Real Time
Famous quotes containing the word time:
“At about that time I was once sitting at my place and whispering—it was naughty, I know—with my neighbor. Then you, Herr Professor Rudner, got up from your desk, came calmly down the aisle to me: “Did you speak?” and slapped me smack in the face. And I—the fury is inside me to this day—I didn’t hit back. Such were the methods of objectivity.”
—Alfred Döblin (1878–1957)