使用Python TCP ping，时间度量与其他工具有什么不同？

Question

我正在尝试写一个简单的工具来测量TCP端口的开放程度，代码运行良好。我遇到的问题是，当我将TCP ping结果与其他工具进行比较时，比如psping (Sysinternals)，tcpping，check_tcp(Nagios)，我得到的结果比我的代码要低得多。在我的代码中，打开TCP端口大约需要9~10ms，其他工具一开始需要0.200~0.500ms，考虑到这与我的计算机上有多个接口的情况有关，我添加了绑定到正确的接口，并且没有改变结果。此外，我还发现了python和其他工具的区别，我使用Wireshark来捕获python和psping，我发现从客户端FIN，ACK的最后握手在Python中要比psping慢得多，这就是10ms的区别。在Python TCP中是否有任何标志可以使其更快？我的问题是，为什么我得到了如此不同的结果？请指教，谢谢

Answer 1

正如babygame0ver建议的帖子解决了“延迟”问题，增加了线程和延迟现在很多其他工具感谢

 #!/usr/bin/env python3
"""
TCP Ping Test (defaults to port 80, 10000 packets)

Usage: ./tcpping.py host [port] [maxCount]
- Ctrl-C Exits with Results
"""

import sys
import socket
import time
import signal
from timeit import default_timer as timer
import threading

host = None
port = 80
a = time.clock()
time.sleep(2)
b = time.clock()
print(b-a)
# Default to 10000 connections max
maxCount = 10000
count = 0

## Inputs

# Required Host
try:
    host = sys.argv[1]
except IndexError:
    print("Usage: tcpping.py host [port] [maxCount]")
    sys.exit(1)

# Optional Port
try:
    port = int(sys.argv[2])
except ValueError:
    print("Error: Port Must be Integer:", sys.argv[3])
    sys.exit(1)
except IndexError:
    pass

# Optional maxCount
try:
    maxCount = int(sys.argv[3])
except ValueError:
    print("Error: Max Count Value Must be Integer", sys.argv[3])
    sys.exit(1)
except IndexError:
    pass

# Pass/Fail counters
passed = 0
failed = 0


def getResults():
    """ Summarize Results """

    lRate = 0
    if failed != 0:
        lRate = failed / (count) * 100
        lRate = "%.2f" % lRate

    print("\nTCP Ping Results: Connections (Total/Pass/Fail): [{:}/{:}/{:}] (Failed: {:}%)".format((count), passed, failed, str(lRate)))

def signal_handler(signal, frame):
    """ Catch Ctrl-C and Exit """
    getResults()
    sys.exit(0)

# Register SIGINT Handler
signal.signal(signal.SIGINT, signal_handler)

# Loop while less than max count or until Ctrl-C caught
while count < maxCount:

    # Increment Counter
    count += 1

    success = False

    # New Socket
    s = socket.socket(
    socket.AF_INET, socket.SOCK_STREAM)
    s.bind(('192.168.10.19', 0))

    # 1sec Timeout
    s.settimeout(1)


    # Try to Connect
    try:
        # Start a timer


        t = threading.Thread(target=s.connect((host, int(port))))
        #threads.append(t)
        s_start = timer()
        t.start()

        # Stop Timer
        s_stop = timer()
        s.shutdown(socket.SHUT_RD)
        success = True

    # Connection Timed Out
    except socket.timeout:
        print("Connection timed out!")
        failed += 1
    except OSError as e:
        print("OS Error:", e)
        failed += 1

    # Stop Timer
    #s_stop = timer()
    s_runtime = "%.2f" % (1000 * (s_stop - s_start))

    if success:
        print("Connected to %s[%s]: tcp_seq=%s time=%s ms" % (host, port, (count-1), s_runtime))
        passed += 1

    # Sleep for 1sec
    if count < maxCount:
        time.sleep(1)

# Output Results if maxCount reached
getResults()