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子进程有建立多个线程，以获得基于进程服务器的稳定性。

2．IHS就是基于worker MPM的模式，其工作原理是IHS根据负载的情况，增加或减少进程数量，一个单独的父控制进程负责管理（建立或删除）子进程，每个子进程可以建立多个服务线程和一个监听线程，监听线程监听请求并转发给服务线程处理。

2.2 参数说明

参数设置文件路径：

IHS的参数配置文件：{ IHS_HOME }/conf/httppd.conf

重点内容：

#

# KeepAlive: Whether or not to allow persistent connections (more than

# one request per connection). Set to "Off" to deactivate.

#

KeepAlive On

#

# MaxKeepAliveRequests: The maximum number of requests to allow

# during a persistent connection. Set to 0 to allow an unlimited amount.

# We recommend you leave this number high, for maximum performance.

#

MaxKeepAliveRequests 0

#

# KeepAliveTimeout: Number of seconds to wait for the next request from the

# same client on the same connection.

#

KeepAliveTimeout 16

##

## Server-Pool Size Regulation (MPM specific)

##

# worker MPM

# ThreadLimit: maximum setting of ThreadsPerChild

# ServerLimit: maximum setting of StartServers

# StartServers: initial number of server processes to start

# MaxClients: maximum number of simultaneous client connections

# MinSpareThreads: minimum number of worker threads which are kept spare

# MaxSpareThreads: maximum number of worker threads which are kept spare