Python Count Wall Clock Time

The second type of time is called wall clock time which measures the total time to execute a program in a computer.
Python count wall clock time. To measure time elapsed during program s execution either use time clock or time time functions. This function in combination with a loop serves as the python countdown timer. Time module in python provides various time related functions. Time clock was removed in python 3 8 because it had platform dependent behavior.
A prerequisite before we dive into the difference of measuring time in python is to understand various types of time in the computing world. On windows this function returns wall clock seconds elapsed since the first call to this function as a floating point number based on the win32 function queryperformancecounter. It does include time elapsed during sleep and is system wide. Pythom time method clock returns the current processor time as a floating point number expressed in seconds on unix.
Return the value in fractional seconds of a performance counter i e. The precision of returned float value depends on the called c library function. The duration for which we want to delay the execution is passed as an argument to the sleep function in seconds. For the best measure of elapsed time since python 3 3 use time perf counter.
Perf counter function always returns the float value of time in seconds. The first type of time is called cpu or execution time which measures how much time a cpu spent on executing a program. On unix return the current processor time as a floating point number expressed in seconds. A clock with the highest available resolution to measure a short duration.
As most of the functions defined in time module call corresponding c library function. Python s time library contains a predefined sleep function. Time clock method also call c library function of the same name to get the result. Time clock method of time module in python is used to get the current processor time as a floating point number expressed in seconds.
Note that different systems will have different accuracy based on their internal clock setup ticks per second. But it s generally at least under 20ms. Also note that clock returns different things on different platforms. Return the value in fractional seconds of a performance counter i e.
On windows this function returns wall clock seconds elapsed since the first call to this function as a floating point number. A clock with the highest available resolution to measure a short duration.