Python Count Wall Clock Time

As most of the functions defined in time module call corresponding c library function. The first type of time is called cpu or execution time which measures how much time a cpu spent on executing a program. Time module in python provides various time related functions.

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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.

Python count wall clock time.

Time clock method of time module in python is used to get the current processor time as a floating point number expressed in seconds. A clock with the highest available resolution to measure a short duration. This function in combination with a loop serves as the python countdown timer. Perf counter function always returns the float value of time in seconds.

Python s time library contains a predefined sleep function. Return the value in fractional seconds of a performance counter i e. To measure time elapsed during program s execution either use time clock or time time functions. Return the value in fractional seconds of a performance counter i e.

Note that different systems will have different accuracy based on their internal clock setup ticks per second. On windows this function returns wall clock seconds elapsed since the first call to this function as a floating point number. Pythom time method clock returns the current processor time as a floating point number expressed in seconds on unix. The duration for which we want to delay the execution is passed as an argument to the sleep function in seconds.

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. Also note that clock returns different things on different platforms. It does include time elapsed during sleep and is system wide.

Time clock method also call c library function of the same name to get the result. For the best measure of elapsed time since python 3 3 use time perf counter. The python docs state that this function should be used for benchmarking purposes. It does include time elapsed during sleep and is system wide.

The precision of returned float value depends on the called c library function. But it s generally at least under 20ms. A clock with the highest available resolution to measure a short duration. On unix return the current processor time as a floating point number expressed in seconds.

The second type of time is called wall clock time which measures the total time to execute a program in a computer. The precision depends on that of the c function of the same name but in any case this is the function to use for benchmarking python or timing algorithms.

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