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From "BipinDas-Gmail" <>
Subject RE: [users@httpd] Apache hangs when maximum connection beyond 2000
Date Wed, 20 May 2009 06:58:31 GMT
Thanks Prasanna for your valuable feedback. So you recommend to change the
Serverlimit to 41 and Threads per child is 50 in worker? 

My goal is to set up this server for serving around 2000 connections
simultaneously with  minimum load. Any more changes to be needed ?


Thanks again.


Greetings ....



From: Prasanna Ram Venkatachalam [] 
Sent: Wednesday, May 20, 2009 4:47 AM
Subject: Re: [users@httpd] Apache hangs when maximum connection beyond 2000


Also in prefork, MaxClients is 256 (ServerLimit also) which means at max
only 256 processes can run and serve 256 connections simultaneously. In your
case 2000 well exceeds this. (i personally suggest worker rather than
prefork since for 2000 connections even if you change the settings,
processes running in the system would shoot up unneccessarily taking more

In which model your apache is running now?

Prasanna Ram

On Wed, May 20, 2009 at 7:11 AM, Prasanna Ram Venkatachalam
<> wrote:

ServerLimit is 21 in worker and ThreadsPerChild is 25. So that means at MAX,
21 httpd will be running with with 25 threads each serving requests. I don't
think it will serve 2000 connections simultaneously. Can you change it to 50
and 41 and see whether it works? (just a thought)

Prasanna Ram

On Wed, May 20, 2009 at 2:13 AM, BipinDas-Gmail <> wrote:

Hello Everybody


I have a webserver running on Dell Poweredge Xeon Processor with 4GB Ram.
There is only one website a learning management system called

Moodle. Configuration of Apache is as follows.


This is the Prefork Module.

<IfModule prefork.c>

StartServers       8

MinSpareServers    5

MaxSpareServers   20

ServerLimit      256

MaxClients       256

MaxRequestsPerChild  4000




This is the Worker Module


<IfModule worker.c>

StartServers         2

ServerLimit          21

MaxClients          2000 (This was before 256,I changed to 2000)

MinSpareThreads     25

MaxSpareThreads     75

ThreadsPerChild     25

MaxRequestsPerChild  0



When the output    "netstat -tn | wc -l " goes beyond the 2000 the load of
the server will go high say above 100 and server will hang down.

I need to avoid this. So what will be the configuration to be changed to
increase the client connection above this limit. Because students 

are accessing this site across the country simultaneously from NAT mode.


Please help,Thanks in advance.


Greetings ....





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