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