提校效能限制設定：
<IfModule prefork.c>
# number of server processes to start
# http://httpd.apache.org/docs/2.2/mod/mpm_common.html#startservers
StartServers 128
# minimum number of server processes which are kept spare
# http://httpd.apache.org/docs/2.2/mod/prefork.html#minspareservers
MinSpareServers 16
# maximum number of server processes which are kept spare
# http://httpd.apache.org/docs/2.2/mod/prefork.html#maxspareservers
MaxSpareServers 64
# highest possible MaxClients setting for the lifetime of the Apache process.
# http://httpd.apache.org/docs/2.2/mod/mpm_common.html#serverlimit
ServerLimit 2048
# maximum number of server processes allowed to start
# http://httpd.apache.org/docs/2.2/mod/mpm_common.html#maxclients
MaxClients 2048
# maximum number of requests a server process serves
# http://httpd.apache.org/docs/2.2/mod/mpm_common.html#maxrequestsperchild
MaxRequestsPerChild 10000
</IfModule>
重啟 apache 請先 stop 再 start。
/etc/init.d/apache2 stop
/etc/init.d/apache2 start
