timestamp speed and precision

timestamp_speed.py

from datetime import datetime

import numpy as np

import time

n = 100000


mark1 = datetime.now()
t0 = time.perf_counter()
count = 0
for i in range(n):
    mark2 = datetime.now()
    if mark1 < mark2:
        mark1 = mark2
        count += 1
print(time.perf_counter() - t0, count)


mark1 = np.datetime64(datetime.now())
t0 = time.perf_counter()
count = 0
for i in range(n):
    mark2 = np.datetime64(datetime.now())
    if mark1 < mark2:
        mark1 = mark2
        count += 1
print(time.perf_counter() - t0, count)

mark1 = time.time()
t0 = time.perf_counter()
count = 0
for i in range(n):
    mark2 = time.time()
    if mark1 < mark2:
        mark1 = mark2
        count += 1
print(time.perf_counter() - t0, count)

mark1 = time.perf_counter_ns()
t0 = time.perf_counter()
count = 0
for i in range(n):
    mark2 = time.perf_counter_ns()
    if mark1 < mark2:
        mark1 = mark2
        count += 1
print(time.perf_counter() - t0, count)

On my machine:

0.042509458002314204 42070
0.2643832920002751 100000
0.010956333000649465 10884
0.015090416000020923 100000