How to optimize Apache heavy load server

It is true that 20 thousand requests per day are not large, but if they are presented during peak hours, and they are not displayed in the evening or at other times, they are normally distributed and all download services require time, the load is huge. It is true that 20 thousand requests per day are not large, but if they are presented during peak hours, and they are not displayed in the evening or at other times, they are normally distributed and all download services require time, the load is huge.

The maximum number of processes that Apache promises to open for pleading is 256, and the limit of MaxClients is 256. if there are more users, you can only see Waiting for reply .... wait until the next available process is displayed. The maximum number is determined by the Apache program-its NT version can have 1024, but the Unix version only has 256, you can in src/include/httpd. h
See:
# Ifndef HARD_SERVER_LIMIT
# Ifdef WIN32
# Define HARD_SERVER_LIMIT 1024
# Else
# Define HARD_SERVER_LIMIT 256
# Endif
# Endif
You can tune it to 1024 and then compile your system. Remember that in httpd. conf
To change the configuration, the default value is 150. For the following machine, adjust to the top 512
Death, if it is higher, the system can not stand.

In addition, some systems limit the maximum number of processes for a user. You can use ulimit-u
Let's see. Linux is generally 256. So if you really want Apache to exceed this number, you have to adjust it.
This parameter:
Ulimit-u unlimited
This parameter must be corrected before Apache runs. Therefore, we recommend that you add this parameter to apachectl:
Case $ ARG in
Start)
If [$ RUNNING-eq 1]; then
Echo '$0 $ ARG: httpd (pid $ PID) already running'
Continue
Change
Case $ ARG in
Start)
Ulimit-u unlimited
If [$ RUNNING-eq 1]; then
Echo '$0 $ ARG: httpd (pid $ PID) already running'
Continue