You cna find the instances of apache in the processlist by using  top command or you can gerp the httpd threds by using the following command

ps -ax | grep httpd

Tools such as top and ps may be used to examine your process list and determine the size of processes. The server-status handler, provided by mod_status, may be used to determine the total number of Apache processes running at a given time.

It is very Important to get Apache server status. it will help you to identify that what is happening inside your web server.

For more info check it here

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