Python网络编程——修改套接字发送和接收的缓冲区大小

很多情况下,默认的套接字缓冲区大小可能不够用。此时,可以将默认的套接字缓冲区大小改成一个更合适的值。

1. 代码

 1 # ! /usr/bin/env python
 2 # -*- coding: utf-8 -*-
 3 
 4 import socket
 5 
 6 # 设置发送缓冲域大小
 7 SEND_BUF_SIZE = 4096
 8 # 设置接收缓冲域大小
 9 RECV_BUF_SIZE = 4096
10 
11 
12 def modify_buff_size():
13     # 创建TCP socket
14     # UDP socket —— s=socket.socket(socket.AF_INET,SOCK_DGRAM)
15     sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
16 
17     # 获取当前套接字关联的选项
18     # socket.SOL_SOCKET —— 正在使用的socket选项
19     # socket.SO_SNDBUF —— 发送缓冲区大小
20     bsize = sock.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF)
21     #打印更改前的发送缓冲区大小
22     print("Buffer size [Before]: %d" % bsize)
23 
24     # 设置TCP套接字关联的选项
25     # socket.TCP_NODELAY TCP层套接口选项
26     # 1 —— 表示将TCP_NODELAY标记为TRUE
27     sock.setsockopt(socket.SOL_TCP, socket.TCP_NODELAY, 1)
28 
29     # 设置发送缓冲域套接字关联的选项
30     sock.setsockopt(
31         socket.SOL_SOCKET,
32         socket.SO_SNDBUF,
33         SEND_BUF_SIZE)
34 
35     # 设置接收缓冲域套接字关联的选项
36     sock.setsockopt(
37         socket.SOL_SOCKET,
38         socket.SO_RCVBUF,
39         RECV_BUF_SIZE)
40 
41     # 获取设置后的发送缓冲域
42     bsize = sock.getsockopt(socket.SOL_SOCKET, socket.SO_SNDBUF)
43     print("Buffer size [After] : %d" % bsize)
44 
45 if __name__ == '__main__':
46     modify_buff_size()

2.setsockopt()和getsockopt()

 1 def setsockopt(self, level, option, value):  # real signature unknown; restored from __doc__
 2     """
 3     setsockopt(level, option, value)
 4 
 5     Set a socket option.  See the Unix manual for level and option.
 6     The value argument can either be an integer or a string.
 7     """
 8     pass
 9 
10 def getsockopt(self, level, option, buffersize=None):  # real signature unknown; restored from __doc__
11     """
12     getsockopt(level, option[, buffersize]) -> value
13 
14     Get a socket option.  See the Unix manual for level and option.
15     If a nonzero buffersize argument is given, the return value is a
16     string of that length; otherwise it is an integer.
17     """
18     pass
19 后续添加解释

3.AF_INET和SOCK_STREAM解释

1 socket.AF_INET —— 服务器之间网络通信
2 socket.SOCK_STREAM提供有序的、可靠的、双向的和基于连接的字节流,使用带外数据传送机制,为Internet地址族使用TCP。
3 SOCK_STREAM类型的套接口为全双向的字节流。对于流类套接口,在接收或发送数据前必需处于已连接状 态。用connect()调用建立与另一套接口的连接,连接成功后,即可用send()和recv()传送数据。当会话结束后,调用closesocket()。带外数据根据规定用send()和recv()来接收。

4.运行结果

1 Buffer size [Before]: 65536
2 Buffer size [After] : 4096

 

posted @ 2016-09-21 22:58  欧阳逸轩  阅读(10597)  评论(0编辑  收藏  举报