修改httpd.conf，在里面设置：
MaxSpareServers n
其中n是一个整数。这样当空闲进程超过n的时候，apache主进程会杀掉多余的空闲进程而保持空闲进程在n，节省了系统资源。如果在一个apache非常繁忙的站点调节这个参数才是必要的，但是在任何时候把这个参数调到很大都不是一个好主意。
同时也可以设置：
MinSpareServers n
来限制最少空闲进程数目来加快反应速度。
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