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From "Martin Gainty" <mgai...@hotmail.com>
Subject Re: Peak load of Tomcat-powered server(s)?
Date Wed, 27 Dec 2006 20:08:09 GMT
maxThreads is a hard gate (immutable) attribute specifying the max number of threaded connections
to the implemented connector 
(where there is no distinction between same user connected maxThread times or maxThread users
running concurrently)

HTH
Martin --
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----- Original Message ----- 
From: "Li Ma" <lima01@gmail.com>
To: "Tomcat Users List" <users@tomcat.apache.org>; "Martin Gainty" <mgainty@hotmail.com>
Sent: Tuesday, December 26, 2006 10:26 PM
Subject: Re: Peak load of Tomcat-powered server(s)?


Martin,

For the concept No 2, I dont understand why the user defined in
tomcat-users.xml will matter to number of connection or maxThreads?

Can you explain more?

Thanks!

Li

On 12/25/06, Martin Gainty <mgainty@hotmail.com> wrote:
>
> Tim makes a very good point
>
> to make this distinction clearer there are 2 distinct concepts which we
> need to have clear understanding
>
> 1)there may be thousands of of (browser users) connecting in (on unix as
> the nobody account) to a tomcat server
>
> 2)number of <users which are configured under $TOMCAT_HOME/conf/tomcat-
> users.xml which would be configured as something like
> <user username="tomcat" password="tomcat" roles="tomcat"/>
> in the latter case the number of users would be confined to number of
> maxThreads for the connector used
>
> On a side note It is a welcome respite to hear from courteous and polite
> professionals..if only for one day!
>
> Martin--
>
> ---------------------------------------------------------------------------
> This e-mail message (including attachments, if any) is intended for the
> use of the individual or entity to which it is addressed and may contain
> information that is privileged, proprietary , confidential and exempt from
> disclosure. If you are not the intended recipient, you are notified that any
> dissemination, distribution or copying of this communication is strictly
> prohibited.
>
> ---------------------------------------------------------------------------
> Le présent message électronique (y compris les pièces qui y sont annexées,
> le cas échéant) s'adresse au destinataire indiqué et peut contenir des
> renseignements de caractère privé ou confidentiel. Si vous n'êtes pas le
> destinataire de ce document, nous vous signalons qu'il est strictement
> interdit de le diffuser, de le distribuer ou de le reproduire.
> ----- Original Message -----
> From: "Tim Funk" <funkman@joedog.org>
> To: "Tomcat Users List" <users@tomcat.apache.org>
> Sent: Monday, December 25, 2006 9:47 AM
> Subject: Re: Peak load of Tomcat-powered server(s)?
>
>
> > Any modern server can easily handle thousands of concurrent users.
> >
> > But that doesn't answer concurrent requests. Which should be > 100/sec.
> >
> > But there are 2 major factors
> > - use of HttpSession is light - Using HttpSession for users can kill
> > scalability due to memory constraints. (YMMV)
> > - Amount of work each request takes - images/css will be served very
> > quickly as compared to JSP's or servlets which utilize database
> > connectivity or file access.
> >
> >
> > -Tim
> >
> > Li Ma wrote:
> >> Thanks for the suggestions. I agree lots of stuff can only be decided
> after
> >> putting into a specific environment. But still, any number that can be
> >> shared?
> >>
> >> How many concurrent users your Tomcat can serve?
> >>
> >> Thanks again!
> >>
> >> Li
> >>
> >> On 12/24/06, Gary Evesson <lists@evesson.com> wrote:
> >>>
> >>> Generally in a production environment, increasing the number of
> threads
> >>> from
> >>> the default is compulsory. You need to balance that against the amount
> of
> >>> memory that you have allocated for your JVM, which needs to be
> balanced
> >>> against the amount of memory available in the machine.
> >>>
> >>> Handling concurrent users generally comes back to the number of
> >>> connections
> >>> that your architecture can handle and how much work your database
> >>> server(s)
> >>> (assuming you have some) can handle. Our experience has been that
> these
> >>> things become an issue before tomcat does. It depends on your
> application
> >>> *a
> >>> lot*.
> >>>
> >>> Nothing beats real load testing to figure out where *your* stress
> points
> >>> are. They are probably going to be different to other people...
> >>>
> >>> Gary
> >>>
> >>> -----Original Message-----
> >>> From: Li Ma [mailto:lima01@gmail.com]
> >>> Sent: Sunday, December 24, 2006 12:35 PM
> >>> To: Tomcat Users List
> >>> Subject: Re: Peak load of Tomcat-powered server(s)?
> >>>
> >>> Actually you can imagine the server serves a site like mySpace where
> >>> people
> >>> can access their own home, blog, images, forum, etc. I know it is
> still
> >>> not
> >>> easy to answer, but I'm not looking for an answer to my specific
> >>> question.
> >>> I'm just looking for any similiar experience that can be shared and
> >>> hoping
> >>> I
> >>> can learn some.
> >>>
> >>> Another question, how many threads do you think Tomcat can have on one
> >>> machine? And will increasing number of threads help processing more
> >>> requests? I think 100-150 per server per second is not a good number.
> But
> >>> if
> >>> it is true, does that mean Tomcat is not suitable for large website?
> And
> >>> what does commercial products like WebLogic can normally do?
> >>>
> >>> Well, lots of question at my end. Thanks for sharing of your idea. Any
> >>> thing
> >>> will help.
> >>>
> >>> Best!
> >>>
> >>> Li
> >>>
> >>> On 12/24/06, Leon Rosenberg <rosenberg.leon@googlemail.com> wrote:
> >>> >
> >>> > The question is impossible to answer, since you don't tell us what
a
> >>> > user will do :-)
> >>> > However, to give you an example, if your requests are somewhat
> >>> > "normal-web-requests" (producing html) than going for 100-150 per
> >>> > second and server should be a reasonable value.
> >>> >
> >>> > regards
> >>> > Leon
> >>> >
> >>> > P.S. Of course it depends hardly on your use-cases... for example
> your
> >>> > apache in front of tomcat could reduce the performance by 10%
> without
> >>> > giving you anything in exchange.
> >>> >
> >>> > On 12/24/06, Li Ma <lima01@gmail.com> wrote:
> >>> > > I need to setup for a client to run a myspace-like site. My client
> >>> kept
> >>> > > asking me how many concurrent user's I can support. I really don't
> >>> know
> >>> > the
> >>> > > answer.
> >>> > >
> >>> > > We will use Apache, jk_mod, Tomcat and Oracle(clustered). We will
> use
> >>> > X86
> >>> > > servers with Linux.
> >>> > >
> >>> > > Can anyone share your experience and let me know the best load
you
> >>> have
> >>> > > achieved?
> >
> >
> > ---------------------------------------------------------------------
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> >
> >




-- 
Li Ma
lima01@gmail.com
http://www.idealtechs.com
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