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Posted to users@httpd.apache.org by Tushar Swarnakar <tu...@mahindrabt.com> on 2002/04/29 10:51:15 UTC
Apache hangs up for more than 100 concurrent users.
Hi,
I am using Apache 1.3.9 and configured for 150 users on Windows NT server. It works fine with 100 or less than 100 concurrent users. But when more than 100 concurrent users are accessing the Apache then it hangs up and does not response anymore.
I don't know what to do. Please help me out.
Regards
Tushar
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Subscribed <su...@myarchive.biz>.
Owen, you snip you!
Way to get the point across! ;)
====================================
"It is said that if you line up all the cars in the
world end to end, someone would be stupid
enough to try and pass them."
====================================
----- Original Message -----
From: "Owen Boyle" <ob...@bourse.ch>
To: <us...@httpd.apache.org>
Sent: Monday, April 29, 2002 4:01 AM
Subject: Re: Apache hangs up for more than 100 concurrent users.
> > Tushar Swarnakar wrote:
> >
> > Hi,
> > I am using Apache 1.3.9 and configured for 150 users on Windows NT
> > server. It works fine with 100 or less than 100 concurrent users. But
> > when more than 100 concurrent users are accessing the Apache then it
> > hangs up and does not response anymore.
> > I don't know what to do. Please help me out.
>
> I have a VW Golf with a 1.3l engine. I fitted a new speedometer to it
> which goes up to 200 km/h but whenever I go out on the road, the car
> will only get up to about 140 km/h. How can I make it go all the way to
> 200 km/h?
>
> Rgds,
>
> Owen Boyle.
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
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>
>
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Owen Boyle <ob...@bourse.ch>.
Tushar Swarnakar wrote:
>
> I used Rational Robot to simulate 100 users and it is running on different
> machine. I tested for 95 concurrent users, simulated by Rational Robot, and
> it works fine. Once I test for 100 users after that I can't access my page
> through a web browser, no response comes from the web server. After
> restarting Apache, I can access my page again. It also behaves same for the
> settings MaxClients =150.
I'm not familiar with Rational Robot but it sounds funky. Where is your
browser - on the same machine as Rational Robot? (if so, could be the RR
machine's IP interface gets blocked) - on the server? (if so, server IP
blocked?). Try the following to "prove" it:
- define your site on localhost on the apache server (i.e. so that
http://localhost/ on a browser on the apache server leads to your site).
- start apache
- zap it with 100 connections from RR host so it "hangs"
- unplug the network cable from RR host
- try and hit http://localhost/ from a browser on the apache server
Does it work?
I really don't think it is apache which hangs when it gets over 100
simultaneous requests (if it were, this would have been discovered ages
ago as an excellent DoS attack :-)
Rgds,
Owen Boyle.
PS anything in the error/access logs?
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Tushar Swarnakar <tu...@mahindrabt.com>.
I used Rational Robot to simulate 100 users and it is running on different
machine. I tested for 95 concurrent users, simulated by Rational Robot, and
it works fine. Once I test for 100 users after that I can't access my page
through a web browser, no response comes from the web server. After
restarting Apache, I can access my page again. It also behaves same for the
settings MaxClients =150.
----- Original Message -----
From: "Owen Boyle" <ob...@bourse.ch>
To: <us...@httpd.apache.org>
Sent: Friday, May 03, 2002 3:24 PM
Subject: Re: Apache hangs up for more than 100 concurrent users.
> Tushar Swarnakar wrote:
> >
> > The server hangs forever and no requests are ever served again, even
> > after I stop my performance tester. The server does not response any
more.
>
> Very strange. I can think of two things:
>
> - You have dicovered a bug in an ancient version of apache (1.3.9).
> Upgrade to the current version (1.3.24) and try again.
>
> - Your performance tester is buggy. What is it? Did you write it
> yourself? Is it "ab"? Is it running on the same machine as apache (i.e.
> loading localhost)? If so, are you sure it is droppping connections
> after it is stopped (is a zombie hanging around, blocking sockets?) What
> do you have to do to get running again - reboot? Or is it sufficient to
> restart apache?
>
> As an experiment, can you test the theory that the problem only occurs
> if you emulate N clients where MaxClients = 2N, i.e. set:
>
> MaxClients = 100, test 50 clients
> MaxClients = 50, test 25 clients
> MaxClients = 30, test 15 clients
> etc.
>
> see if there is any logic to it..
>
> Rgds,
>
> Owen Boyle.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Owen Boyle <ob...@bourse.ch>.
Tushar Swarnakar wrote:
>
> The server hangs forever and no requests are ever served again, even
> after I stop my performance tester. The server does not response any more.
Very strange. I can think of two things:
- You have dicovered a bug in an ancient version of apache (1.3.9).
Upgrade to the current version (1.3.24) and try again.
- Your performance tester is buggy. What is it? Did you write it
yourself? Is it "ab"? Is it running on the same machine as apache (i.e.
loading localhost)? If so, are you sure it is droppping connections
after it is stopped (is a zombie hanging around, blocking sockets?) What
do you have to do to get running again - reboot? Or is it sufficient to
restart apache?
As an experiment, can you test the theory that the problem only occurs
if you emulate N clients where MaxClients = 2N, i.e. set:
MaxClients = 100, test 50 clients
MaxClients = 50, test 25 clients
MaxClients = 30, test 15 clients
etc.
see if there is any logic to it..
Rgds,
Owen Boyle.
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Tushar Swarnakar <tu...@mahindrabt.com>.
The server hangs forever and no requests are ever served again, even
after I stop my performance tester. The server does not response any more.
----- Original Message -----
From: "Owen Boyle" <ob...@bourse.ch>
To: <us...@httpd.apache.org>
Sent: Friday, May 03, 2002 1:47 PM
Subject: Re: Apache hangs up for more than 100 concurrent users.
> Tushar IMAP wrote:
> >
> > I am doing performance testing of our web application on Solaris with
> > Apache1.3.9. I was simulating for 100 concurrent users and the values of
the
> > following directives were
> > MaxClients = 200
> > MaxKeepAliveRequests = 250
> > MaxRequestsPerChild = 0
> > MaxSpareServers = 64
> > MinSpareServers = 32
> > For the above settings and for 100 concurrent users, apache . But if
> > I comment out MaxClients directive then apache does not hang for 100
> > concurrent user.
>
> This is whole lot more information than on your original mail!
>
> I am not clear about what you mean by "apache hangs up"... Do you mean;
> (1) Request 101 is not answered, but if you stop performance testing,
> the server works again.
> or
> (2) The server hangs forever and no requests are ever served again, even
> after you stop your performance tester.
>
> If (1) then I would say that this is expected behaviour with MaxClients
> = 200. Although, I would suspect a bug in your performance testing
> program in which if you specify 100 clients, it really emulates twice
> that number...
>
> If (2) then that's really odd. However, apache_1.3.9 is pretty ancient
> by now - you might like to upgrade to 1.3.24.
>
> Rgds,
>
> Owen Boyle.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Owen Boyle <ob...@bourse.ch>.
Tushar IMAP wrote:
>
> I am doing performance testing of our web application on Solaris with
> Apache1.3.9. I was simulating for 100 concurrent users and the values of the
> following directives were
> MaxClients = 200
> MaxKeepAliveRequests = 250
> MaxRequestsPerChild = 0
> MaxSpareServers = 64
> MinSpareServers = 32
> For the above settings and for 100 concurrent users, apache . But if
> I comment out MaxClients directive then apache does not hang for 100
> concurrent user.
This is whole lot more information than on your original mail!
I am not clear about what you mean by "apache hangs up"... Do you mean;
(1) Request 101 is not answered, but if you stop performance testing,
the server works again.
or
(2) The server hangs forever and no requests are ever served again, even
after you stop your performance tester.
If (1) then I would say that this is expected behaviour with MaxClients
= 200. Although, I would suspect a bug in your performance testing
program in which if you specify 100 clients, it really emulates twice
that number...
If (2) then that's really odd. However, apache_1.3.9 is pretty ancient
by now - you might like to upgrade to 1.3.24.
Rgds,
Owen Boyle.
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Tushar IMAP <tu...@mahindrabt.com>.
I am doing performance testing of our web application on Solaris with
Apache1.3.9. I was simulating for 100 concurrent users and the values of the
following directives were
MaxClients = 200
MaxKeepAliveRequests = 250
MaxRequestsPerChild = 0
MaxSpareServers = 64
MinSpareServers = 32
For the above settings and for 100 concurrent users, apache hangs up. But if
I comment out MaxClients directive then apache does not hang for 100
concurrent user.
----- Original Message -----
From: "Owen Boyle" <ob...@bourse.ch>
To: <us...@httpd.apache.org>
Sent: Thursday, May 02, 2002 6:14 PM
Subject: Re: Apache hangs up for more than 100 concurrent users.
> Tushar Swarnakar wrote:
> >
> > If I remove MaxClients directive from the httpd.conf file and start
apache
> > for more than 100 hundred users then it never hangs up and runs
properly.
> >
>
> I don't understand what you're asking. Do you mean that when you use
> MaxClients apache hangs?
>
> - How busy is your site?
> - if it is on the internet, what is its IP?
> - What do you have for the following directives (1) when it works, (2)
> when it hangs?
>
> MaxClients
> MaxKeepAliveRequests
> MaxRequestsPerChild
> MaxSpareServers
> MinSpareServers
>
> Rgds,
>
> Owen Boyle.
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Owen Boyle <ob...@bourse.ch>.
Tushar Swarnakar wrote:
>
> If I remove MaxClients directive from the httpd.conf file and start apache
> for more than 100 hundred users then it never hangs up and runs properly.
>
I don't understand what you're asking. Do you mean that when you use
MaxClients apache hangs?
- How busy is your site?
- if it is on the internet, what is its IP?
- What do you have for the following directives (1) when it works, (2)
when it hangs?
MaxClients
MaxKeepAliveRequests
MaxRequestsPerChild
MaxSpareServers
MinSpareServers
Rgds,
Owen Boyle.
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Tushar Swarnakar <tu...@mahindrabt.com>.
If I remove MaxClients directive from the httpd.conf file and start apache
for more than 100 hundred users then it never hangs up and runs properly.
----- Original Message -----
From: "Owen Boyle" <ob...@bourse.ch>
To: <us...@httpd.apache.org>
Sent: Monday, April 29, 2002 2:31 PM
Subject: Re: Apache hangs up for more than 100 concurrent users.
> > Tushar Swarnakar wrote:
> >
> > Hi,
> > I am using Apache 1.3.9 and configured for 150 users on Windows NT
> > server. It works fine with 100 or less than 100 concurrent users. But
> > when more than 100 concurrent users are accessing the Apache then it
> > hangs up and does not response anymore.
> > I don't know what to do. Please help me out.
>
> I have a VW Golf with a 1.3l engine. I fitted a new speedometer to it
> which goes up to 200 km/h but whenever I go out on the road, the car
> will only get up to about 140 km/h. How can I make it go all the way to
> 200 km/h?
>
> Rgds,
>
> Owen Boyle.
>
> ---------------------------------------------------------------------
> The official User-To-User support forum of the Apache HTTP Server Project.
> See <URL:http://httpd.apache.org/userslist.html> for more info.
> To unsubscribe, e-mail: users-unsubscribe@httpd.apache.org
> For additional commands, e-mail: users-help@httpd.apache.org
>
*********************************************************
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If you are not the intended recipient, you should
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Re: Apache hangs up for more than 100 concurrent users.
Posted by Owen Boyle <ob...@bourse.ch>.
> Tushar Swarnakar wrote:
>
> Hi,
> I am using Apache 1.3.9 and configured for 150 users on Windows NT
> server. It works fine with 100 or less than 100 concurrent users. But
> when more than 100 concurrent users are accessing the Apache then it
> hangs up and does not response anymore.
> I don't know what to do. Please help me out.
I have a VW Golf with a 1.3l engine. I fitted a new speedometer to it
which goes up to 200 km/h but whenever I go out on the road, the car
will only get up to about 140 km/h. How can I make it go all the way to
200 km/h?
Rgds,
Owen Boyle.
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RE: Apache hangs up for more than 100 concurrent users.
Posted by Milind Sawant <mi...@skandiabank.ch>.
Hi
increase the no of server processes using the MaxSpareServers parameter.
Milind Sawant
Web Administrator (Apollo)
TCS
+0041 1 288 4675
-----Original Message-----
From: Tushar Swarnakar [mailto:tushars@mahindrabt.com]
Sent: 29 April 2002 10:51
To: users@httpd.apache.org
Subject: Apache hangs up for more than 100 concurrent users.
Hi,
I am using Apache 1.3.9 and configured for 150 users on Windows NT
server. It works fine with 100 or less than 100 concurrent users. But when
more than 100 concurrent users are accessing the Apache then it hangs up and
does not response anymore.
I don't know what to do. Please help me out.
Regards
Tushar
*********************************************************
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confidential information intended for a specific
individual and purpose, and is protected by law.
If you are not the intended recipient, you should
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any disclosure, copying, or distribution of this
message, or the taking of any action based on it,
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