问题
I am hosting multiple sites on a server with 7.5gb RAM. Using apache2 mpm_prefork.
Following command gives me a value of 200-300 in production
ps aux|grep -c 'apache2'
Using top i see only some hundred megabytes of RAM is free. Error log show nothing unusual. Is this much apache2 process normal?
MaxRequestWorkers is set to 512
Update:
Now i am using mod-status to check apache activity.
I have a row like this
Srv PID Acc M CPU SS Req Conn Child Slot Client VHost Request
0-0 29342 2/2/70 W 0.07 5702 0 3.0 0.00 1.67 XXX XXX /someurl
If i check again after sometime PID not changes and i get SS with greater value that previous time. M of this request is in 'W` sending reply state. So that means apache2 process locked in for that request?
回答1:
On my VPS and root servers, the situation is partially similar. AFAIK the os tries to distribute most of the processing power/RAM to running processes and frees the resources for other processes as the need arises.
来源：https://stackoverflow.com/questions/42489182/apache2-processes-stuck-in-sending-reply-w