![]() Time.time() shows that the wall-clock time has passed approximately one second while time.clock() shows the CPU time spent on the current process is less than 1 microsecond. Here is an example of running time.time and time.clock on a Unix machine: Another difference between time.time and time.clock is that time.time could return a lower-value than a previous call if the system clock has been set back between the two calls while time.clock always return non-decreasing values. While on Windows, it returns the wall-clock time expressed in seconds elapsed since the first call to this function, based on the Win32 function QueryPerformanceCounter. On Unix, time.clock returns the current processor time expressed in seconds, i.e., the CPU time it takes to execute the current thread so far. While time.time behaves the same on Unix and on Windows, time.clock has different meanings. time.time is often used to benchmark a program on Windows. For Windows, the epoch is January 1, 1601. For any operatin system, you can always run time.gmtime(0) to find out what epoch is on the given system. time.time returns the time in seconds since the epoch, i.e., the point where the time starts. Two useful functions for time measurement are time.time and time.clock. Since most of the time functions call platform-specific C library functions with the same name, the semantics of these functions are platform-dependent. Python's time module provides various time-related functions. One should remember that the system clock could be modified by the operating system, thus modifying the system time. System time represents a computer system's notion of the passing of time. Compared to the CPU time, the wall-clock time is often longer because the CPU executing the measured program may also be executing other program's instructions at the same time.Īnother important concept is the so-called system time, which is measured by the system clock. The wall-clock time is also called elapsed or running time. The second type of time is called wall-clock time, which measures the total time to execute a program in a computer. The first type of time is called CPU or execution time, which measures how much time a CPU spent on executing a program. ![]() Last Updated: Wednesday 29 th December 2021Ī prerequisite before we dive into the difference of measuring time in Python is to understand various types of time in the computing world.
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