测试此 UDP 套接字 Python 代码：奇怪的延迟； Windows 对比 Linux

Question

我以 1 毫秒的间隔发送数据，但在接收端，我似乎一次收到 15-16 个数据包，然后在 15-16 毫秒延迟后接收另一组数据包。

请尝试此代码，看看您是否有相同的结果。我正在使用 Windows 10 机器。我试过 2 件，结果相同。任何见解将不胜感激。

# -*- coding: utf-8 -*-
"""
Created on Thu Sep  3 23:32:44 2020

@author: Pratyush
"""

# sender.py
import socket
from time import sleep,monotonic_ns

TEMPO = 1e6
send = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
last_second = monotonic_ns()
iteration_count = 0
while iteration_count < 1000:
    if monotonic_ns() >= last_second + TEMPO:
        last_second += TEMPO
        send.sendto(bytes(32), ('127.0.0.1', 8208))       
        iteration_count += 1

接收代码如下，运行先receiver.py

# -*- coding: utf-8 -*-
"""
Created on Thu Sep  3 23:32:13 2020

@author: Pratyush
"""

# receiver2.py
import socket
import time
"""
just get the raw values from UDP socket every 1ms
The sender sends it with that temporal resolution

"""

UDP_IP = ""
UDP_PORT = 8208 #UDP phasor values 32 bytes (V,phi,P)
sock_ph = socket.socket(socket.AF_INET,  # Internet
                     socket.SOCK_DGRAM)  # UDP
sock_ph.bind((UDP_IP, UDP_PORT))
print("socket bound, waiting for data...")

while True:
    time_before_raw = time.monotonic_ns()
    raw = sock_ph.recv(32) #I am receiving 32 bytes data
    time_after_raw = time.monotonic_ns()
    # print((time_after_raw-time_before_raw),raw,len(raw))
    print((time_after_raw-time_before_raw),len(raw))

我收到的结果如下：

0 32
0 32
16000000 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
15000000 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32
0 32

Answer 1

根据 PEP，Windows'单调时钟的分辨率为 15mS。很可能是您在输出中看到的粒度。

https://www.python.org/dev/peps/pep-0564/#id23

测试此 UDP 套接字 Python 代码：奇怪的延迟； Windows 对比 Linux

Test this UDP socket Python Code: Weird delay; Windows vs Linux

python

python-3.x

sockets

udp

real-time