Python time.perf_counter_ns() Function

Last Updated : 05 Nov, 2021

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')