Onnowpurbo at 09:36, 11 December 2018

2018-12-11T09:36:23Z

← Older revision		Revision as of 09:36, 11 December 2018
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	"You can, and should, control the MaxClients setting so that your server does not spawn		"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		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		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		as top, and divide this into your total available memory, leaving some room for other
	processes."		processes."

			Get the Apache process average size:

			ps -ylC apache2 --sort:rss

	~~up vote~~		S UID PID PPID C PRI NI RSS SZ WCHAN TTY TIME CMD
	6		S 33 6233 25895 0 80 0 7432 72802 poll_s ? 00:00:00 apache2
	~~down vote~~		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

	~~Complementing @Sameer answer, I read a lot of this theme and what I do~~ is ~~this:~~		As you can see in the SZ column my Apache process size is about 73 MB

	~~Get~~ the ~~Apache process average size:~~		Make the following formula

	~~server# ps -ylC apache2 -~~-~~sort:rss~~		MaxClients: ((Total_Memory)(1024)(MB) - Other_processes_memory) / 73

	~~S UID PID PPID C PRI NI RSS SZ WCHAN TTY TIME CMD~~		For Example: I have 16 GB RAM, I might leave free 2 GB for any other processes
	~~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~~		MaxClients: ((16*1024) - 2048) / 73
			MaxClient: 196
	~~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.		This is what I use & my server is going great.

Onnowpurbo: Created page with ""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: determ..."

2018-12-11T02:31:20Z

Created page with ""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: determ..."

New page

"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."

up vote
6
down vote

Complementing @Sameer answer, I read a lot of this theme and what I do is this:

Get the Apache process average size:

server# 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

enter image description here

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

==Pranala Menarik==

* [[Network Benchmarking]]

Apache: Menghitung Max Client - Revision history

Onnowpurbo at 09:36, 11 December 2018

Onnowpurbo: Created page with ""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: determ..."