Question

我用子进程调用了ping命令。我计算的时差低于运行时间。

延迟：361.953 [实际操作时间]

calculated_latency：0.7531721591949463 [用python计算]

如果python逐行执行，那么计算的延迟将高于原始延迟。我不知道发生了什么，我怎么能计算函数调用的时间。

import subprocess
import shlex
import re
import time
from datetime import datetime

command_line = "ping -c 1 {}".format('yahoo.com')
args = shlex.split(command_line)
try:
    start = time.time()
    output = subprocess.check_output(args)
    end = time.time()
    ping_latency_calculated = end - start

    result = str(output).strip("b'")

    m = re.search(r"\/(\d+\.\d+)\/", result)
    ping_latency = m.group(1)

    result = {'latency': ping_latency, 'calculated_latency': ping_latency_calculated}

except subprocess.CalledProcessError as e:
    result = {'Status': 'Ping Failed', 'time': datetime.fromtimestamp(time.time())}

return result

Answer 1

calculated_latency以秒计算，latency以毫秒计算。

所以你得到的结果是：

latency: 361.953 ms
calculated_latency: 753.1721591949463 ms

如何计算函数使用python执行所花费的时间？

1 个答案: