RE: Please help me improve my question skills (number of tomcat apps)

[Marek, Tomas]

Maybe you'd better check this
<http://www.tuxedo.org/~esr/faqs/smart-questions.html>  first or, still
better, ask at The Tomcat Developer List, which can be subscribed here
<http://jakarta.apache.org/site/mail2.html> . The guys there might know.
That's all I can do for you, mate.
 
tom
 
-Original Message-
From: Knutsen Jeffrey S [mailto:[EMAIL PROTECTED]] 
Sent: Monday, June 10, 2002 3:49 PM
To: '[EMAIL PROTECTED]'
Subject: Please help me improve my question skills (number of tomcat apps)
 
I have submitted the following question and received no response.  I know
this isn't a technical problem, but I was hoping for responses from real
developers.  I thought it was a simple question, and have always received
excellent and quick responses from the tomcat mail list in the past, so the
problem must be with me or the way I am asking.
 
Can someone please help me improve myself?  Is this a stupid question?  Have
I perhaps asked it incorrectly?  I am open and receptive to any constructive
criticism available (I can take it, but maybe you could send a direct
response if you want to be extremely brutal?!)
 
All I really want to know is how many applications real developers are
putting on one machine in the real world. I am just looking for an abstract
number, and I am not worried about system configurations at this time.
 
Thanks!
 
 
ORIGINAL QUESTION:
 
I am doing some Tomcat cost/benefit projections for my company.  I need to
determine the maximum number of applications that will run on Tomcat and
still provide stable performance.  I am not interested in a theoretical
number at this time, just seeking information about what real developers are
actually doing with real applications.  
 
At this time, I am not interested in what machine types, OSs,
configurations, versions, are being used.  I understand the answer to my
questions will depend heavily on these issues as well as on the applications
themselves.  I just need to come up with a realistic number of
instances/apps which are being run on a single machine by real users. I am
seeking an answer to the following two questions:
 
Number of Tomcat instances I am running on one machine:
 
Number of individual applications I am running in all instances of Tomcat on
one machine:
 
Please feel free to respond to the mail list, or to me directly at
[EMAIL PROTECTED] (if we don't want to clog the list with
answers to this question).  I will post a final resolution message to the
mail list when I have come to some sort of conclusion.
 
Thanks in advance for your help!
 
 
 
 
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Re: Please help me improve my question skills (number of tomcat apps)

[Craig R. McClanahan]

On Mon, 10 Jun 2002, Arshad Mahmood wrote:

> Date: Mon, 10 Jun 2002 16:49:07 +0100
> From: Arshad Mahmood <[EMAIL PROTECTED]>
> Reply-To: Tomcat Users List <[EMAIL PROTECTED]>
> To: Tomcat Users List <[EMAIL PROTECTED]>
> Subject: Re: Please help me improve my question skills (number of tomcat
> a pps)
>
> Hi,
>
> So the question reduces to:-
> 1. What are the extra memory requirements for a virtual host/context?
> 2. How much longer does it take to decide on a servlet/jsp to invoke for
> an extra virtual host/context?
>
> >From my (limited) understanding of Tomcat, I would say the answer to both of
> these questions is negligible compared to the memory/overhead of processing
> a typical request. So your question reduces to how many requests can be
> processed by your instance, and that depends very much on your application.
> The distribution of the requests amongst the applications shouldm't matter.
>
> Can somebody more knowledgeable confirm the extra resource requirements for
> virtual hosts/contexts.
>

Virtual hosts and webapps are both looked up via Hashtables (Tomcat 3.x)
or HashMaps (Tomcat 4.x), so the cost is indeed very small - so small that
it's basically not worth worrying about for a standalone Tomcat
installation.

When you're using Tomcat behind a web connector, it really depends on how
the connector is implemented -- and someone else will have to answer those
questions; I never use 'em so don't have any idea.

> Regards,
> Arshad
>

Craig


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Re: Please help me improve my question skills (number of tomcat apps)

[Adrian]

Your question cannot be answered without specifying criteria.
1) OS type
2) JVM type
3) Type and Complexity of Application
4) Are you using connectors
5) Are you connecting to databases

Your current question is like asking how fast and how far will a car go. I
don`t care what
kind of car, or engine.

Adrian

- Original Message -
From: "Knutsen Jeffrey S" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Monday, June 10, 2002 9:48 AM
Subject: Please help me improve my question skills (number of tomcat apps)


> I have submitted the following question and received no response.  I know
> this isn't a technical problem, but I was hoping for responses from real
> developers.  I thought it was a simple question, and have always received
> excellent and quick responses from the tomcat mail list in the past, so
the
> problem must be with me or the way I am asking.
>
> Can someone please help me improve myself?  Is this a stupid question?
Have
> I perhaps asked it incorrectly?  I am open and receptive to any
constructive
> criticism available (I can take it, but maybe you could send a direct
> response if you want to be extremely brutal?!)
>
> All I really want to know is how many applications real developers are
> putting on one machine in the real world. I am just looking for an
abstract
> number, and I am not worried about system configurations at this time.
>
> Thanks!
>
>
> ORIGINAL QUESTION:
>
> I am doing some Tomcat cost/benefit projections for my company.  I need to
> determine the maximum number of applications that will run on Tomcat and
> still provide stable performance.  I am not interested in a theoretical
> number at this time, just seeking information about what real developers
are
> actually doing with real applications.
>
> At this time, I am not interested in what machine types, OSs,
> configurations, versions, are being used.  I understand the answer to my
> questions will depend heavily on these issues as well as on the
applications
> themselves.  I just need to come up with a realistic number of
> instances/apps which are being run on a single machine by real users. I am
> seeking an answer to the following two questions:
>
> Number of Tomcat instances I am running on one machine:
>
> Number of individual applications I am running in all instances of Tomcat
on
> one machine:
>
> Please feel free to respond to the mail list, or to me directly at
> [EMAIL PROTECTED] (if we don't want to clog the list with
> answers to this question).  I will post a final resolution message to the
> mail list when I have come to some sort of conclusion.
>
> Thanks in advance for your help!
>
>
>
>
> --
> To unsubscribe, e-mail:
> <mailto:[EMAIL PROTECTED]>
> For additional commands, e-mail:
> <mailto:[EMAIL PROTECTED]>
>
>
>
> --
> To unsubscribe, e-mail:
<mailto:[EMAIL PROTECTED]>
> For additional commands, e-mail:
<mailto:[EMAIL PROTECTED]>
>
>


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