Apache: Menghitung Max Client
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"You can, and should, control the MaxClients setting so that your server does not spawn so many children it starts swapping. This procedure for doing this is simple: determine the size of your average Apache process, by looking at your process list via a tool such as top, and divide this into your total available memory, leaving some room for other processes."
Get the Apache process average size:
ps -ylC apache2 --sort:rss
S UID PID PPID C PRI NI RSS SZ WCHAN TTY TIME CMD S 33 6233 25895 0 80 0 7432 72802 poll_s ? 00:00:00 apache2 S 33 6250 25895 0 80 0 7432 72802 poll_s ? 00:00:00 apache2 S 33 6278 25895 0 80 0 7432 72802 poll_s ? 00:00:00 apache2 S 33 6280 25895 0 80 0 7432 72802 poll_s ? 00:00:00 apache2 S 33 6577 25895 0 80 0 7432 72802 poll_s ? 00:00:00 apache2 S 33 6299 25895 0 80 0 7772 72891 poll_s ? 00:00:00 apache2 S 33 6295 25895 0 80 0 7776 72891 poll_s ? 00:00:00 apache2
As you can see in the SZ column my Apache process size is about 73 MB
Make the following formula
MaxClients: ((Total_Memory)(1024)(MB) - Other_processes_memory) / 73
For Example: I have 16 GB RAM, I might leave free 2 GB for any other processes
MaxClients: ((16*1024) - 2048) / 73 MaxClient: 196
This is what I use & my server is going great.
You have to consider that my Apache processes are a little heavy, so you could have processes about 50 MB or less.
Regards,
Your SZ is slightly the same for all Apache processes. In my case I have values between 23 and 212 Mb
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What value should I use in your formula ?
By the way in Apache 2.4 MaxClients has been renamed to MaxRequestWorkers. Is your formula still valid for this new parameter ?
Regards