Apache2 为什么有八个httpd过程？

我使用的是linux EC2，启动apache后立即看到8个httpd进程，其中2个由root所有，其余由“apache”所有：

root     22966     1  0 08:03 ?        00:00:00 /usr/sbin/httpd
root     22968 22966  0 08:03 ?        00:00:00 /usr/sbin/httpd
apache   22969 22966  0 08:03 ?        00:00:00 /usr/sbin/httpd
apache   22970 22966  0 08:03 ?        00:00:00 /usr/sbin/httpd
apache   22971 22966  0 08:03 ?        00:00:00 /usr/sbin/httpd
apache   22972 22966  0 08:03 ?        00:00:00 /usr/sbin/httpd
apache   22973 22966  0 08:03 ?        00:00:00 /usr/sbin/httpd
apache   22974 22966  0 08:03 ?        00:00:00 /usr/sbin/httpd

为什么有8个过程？我假设这与prefork/worker配置有关，可能是prefork，但我的/etc/httpd/conf/httpd.conf文件是这样的，没有定义8或6，也许我遗漏了什么

# 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
# ServerLimit: maximum value for MaxClients for the lifetime of the server
# MaxClients: maximum number of server processes allowed to start
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule prefork.c>
StartServers      5
MinSpareServers   3
MaxSpareServers  9
ServerLimit      256
MaxClients       256
MaxRequestsPerChild  4000
</IfModule>

# worker MPM
# 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
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule worker.c>
StartServers         4
MaxClients         300
MinSpareThreads     25
MaxSpareThreads     75
ThreadsPerChild     25
MaxRequestsPerChild  0
</IfModule>

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StartServer+MinSpare服务器？我以为StartServer包括MinSpare，不是吗？也许吧，是的。你能试试吗？参考：