prefork和worker模式的切換

1.將當前的prefork模式啟動文件改名
mv httpd httpd.prefork
2.將worker模式的啟動文件改名
mv httpd.worker httpd
3.修改Apache配置文件
vi /usr/local/apache2/conf/extra/httpd-mpm.conf
找到裡邊的如下一段，可適當修改負載等參數：

StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0

4.重新啟動服務
/usr/local/apache2/bin/apachectl restart
即可換成worker方式啟動apache2

摘自:http://blog.yam.com/htshboy/article/17182660