[文章作者:张宴 本文版本:v1.1 最后修改:2007.07.27 转载请注明出处:http://blog.zyan.cc]

  这两天搭建了一组Apache服务器,每台服务器4G内存,采用的是prefork模式,一开始设置的连接数太少了,需要较长的时间去响应用户的请求,后来修改了一下Apache 2.0.59的配置文件httpd.conf:
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 serves

StartServers         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


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技术大类 » Web服务器 | 评论(47) | 引用(0) | 阅读(109915)
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beiji
2013-3-7 00:07
ps -ef | grep httpd | wc -l

这个值我服务 返回 只有 5 ,是不是说明我服务器能处理的并发只有 5个,如果是就太少了吧 ?是不是设置哪里有问题?
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