apache prefork模式优化错误
修改完apache配置：ServerLimit 20000
StartServers 5
MinSpareServers 5
MaxSpareServers 20
MaxClients 18000
MaxRequestsPerChild 4000
报如下错误：
WARNING: MaxClients of 18000 exceeds ServerLimit value of 256 servers
原因是:ServerLimit的设置默认是256
修改源码参数，从新编译，安装就可以。
# cd SOURCE_HTTPD
# cd server/mpm/prefork
- Modified prefork.c file.
# vi prefork.c
Old:
#define DEFAULT_SERVER_LIMIT 256
New:
#define DEFAULT_SERVER_LIMIT 30000
# cd SOURCE_HTTPD
# make clean
# make
# make install
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