Python time.perf_counter_ns() Function Last Updated : 05 Nov, 2021 Comments Improve Suggest changes Like Article Like Report Python time.perf_counter_ns() function gives the integer value of time in nanoseconds. Syntax: from time import perf_counter_ns We can find the elapsed time by using start and stop functions. We can also find the elapsed time during the whole program by subtracting stoptime and starttime Example 1: Python3 # import perf_counter_ns() from time import perf_counter_ns # integer input from user, 2 input in single line n, m = map(int, input().split()) # Start the stopwatch / counter start = perf_counter_ns() for i in range(n): t = int(input()) # user gave input n times if t % m == 0: print(t) # Stop the stopwatch / counter stop = perf_counter_ns() print("Elapsed time:", stop, 'ns', start, 'ns') print("Elapsed time during the whole program", stop-start, 'ns') Output: Example 2: Python3 # import perf_counter_ns() from time import perf_counter_ns # integer input from user, 2 input in single line n, m = map(int, input().split()) # Start the stopwatch / counter start = perf_counter_ns() for i in range(n): t = int(input()) # user gave input n times if t % m == 0: print(t) # Stop the stopwatch / counter stop = perf_counter_ns() print("Elapsed time:", stop, 'ns', start, 'ns') print("Elapsed time during the whole program", stop-start, 'ns') Output: Comment More infoAdvertise with us Next Article Python time.perf_counter_ns() Function M manojkumarreddymallidi Follow Improve Article Tags : Python Python time-module Practice Tags : python Similar Reads Python | time.clock_getres() method Time module in Python provides various time-related functions. 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