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查看Apache并发请求数及其TCP连接状态[转]

http://blog.s135.com/read.php/269.htm

引用

# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# MaxClients: maximum number of server processes allowed to start
# MaxRequestsPerChild: maximum number of requests a server process servesStartServers 10
MinSpareServers 10
MaxSpareServers 15
ServerLimit 2000
MaxClients 2000
MaxRequestsPerChild 10000


  查看httpd进程数(即prefork模式下Apache能够处理的并发请求数):
Linux命令:

引用

ps -ef | grep httpd | wc -l

返回结果示例:
1388
表示Apache能够处理1388个并发请求,这个值Apache可根据负载情况自动调整,我这组服务器中每台的峰值曾达到过2002。


  查看Apache的并发请求数及其TCP连接状态:
Linux命令:

引用

netstat -n | awk ‘/^tcp/ {++S[$NF]} END {for(a in S) print a, S[a]}’

(这条语句是从 新浪互动社区事业部技术总监王老大那儿获得的,非常不错)
返回结果示例:
LAST_ACK 5
SYN_RECV 30
ESTABLISHED 1597
FIN_WAIT1 51
FIN_WAIT2 504
TIME_WAIT 1057
其中的SYN_RECV表示正在等待处理的请求数;ESTABLISHED表示正常数据传输状态;TIME_WAIT表示处理完毕,等待超时结束的请求数。


  关于TCP状态的变迁,可以从下图形象地看出:
点击在新窗口中浏览此图片
状态:描述
CLOSED:无连接是活动的或正在进行
LISTEN:服务器在等待进入呼叫
SYN_RECV:一个连接请求已经到达,等待确认
SYN_SENT:应用已经开始,打开一个连接
ESTABLISHED:正常数据传输状态
FIN_WAIT1:应用说它已经完成
FIN_WAIT2:另一边已同意释放
ITMED_WAIT:等待所有分组死掉
CLOSING:两边同时尝试关闭
TIME_WAIT:另一边已初始化一个释放
LAST_ACK:等待所有分组死掉

Posted in Apache, shell, 技术.

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