how to run more than one tomcat on single machine

[Peddireddy Srikanth <pe...@gmail.com>]

Michael.

I am a bit new to deployment and related stuff, so can you tell me how
to run more than one tomcat on a single machine. Is the process is
same as having load balancing tomcat clusters on different machines.
or  
Please direct me towards any documentation on this. I will get the
info from there.

regards
Srikanth


On 7/22/05, Michael Kleinhenz <m....@tarent.de> wrote:
> Peddireddy,
> 
> > your mail is very informative.
> > we have a very similar set up (4 Xeon processors 3.5 GB Ram and
> > WIn2003 Standard edition) and hardpart is that we cant change this
> > setup and switch to Linux.
> 
> same problem over here. The computing centre of our client can't provide
> Linux servers. I'm struggling with this problem for 3 weeks now.
> 
> > I heard about clustering on diferent boxes. Is the process of running
> > multiple tomcats on a single machine will be same??
> 
> My experience was that with a single Tomcat on a large machine, you'll
> never use that box fully. Besides that you can't get the Sun JVM to
> accept a large amount of threads while giving them enough memory, Tomcat
> seems to have performance problems with 3000+ threads busy at the same
> time. The BEA JVM (JRockit) performs better in terms of memory and
> threads but is slower than the Sun JVM. If you have rather complex
> database operations performed by your webapp, this will get you into
> trouble, because if there is a single bottleneck in the whole system,
> the requests will pile up in the server, it hits its thread limit, and
> ceases operation.
> 
> So, I have made good experiences with 4 Tomcats on a 2xXeon with 4GB.
> The server's load is somewhere between 70% and 100% while running with
> high load and can handle more concurrent requests than a single Tomcat.
> 
> > You talked about some "workarounds using esoteric registry keys", can
> > you eloborate on this or tell me where I can get details about it and
> > the details about limitations placed by windows2003  on a single
> > process in terms of number of threads, memory etc.
> 
> We use 2003 Standard Edition and get the following limitations:
> 
>  . Windows only provides 2GB memory to all applications running,
>   regardless of how much memory you have. All other memory is used for
>   Windows itself. With a registry key, you can extend this to 3GB. I
>   don't have the key handy, but it can be found in MSDN.
> 
>  . The somewhat larger problem is the crappy TCP stack on Windows. A
>   single Tomcat easily handles 1000 concurrent connections, but if I start
>   4 Tomcats, I get a WSAENOBUFS error ("An operation on a socket could not
>   be performed because the system lacked sufficient buffer space or
>   because a queue was full") at about 3300 concurrent connections.
>   Because each Tomcat runs with his own instance of the JVM, I suppose
>   the problem is Windows, the network or anything else that is used by all
>   Tomcats at the same time. Even worse, after such a crash, there is a
>   10% chance, the Tomcats not resuming normal operation but crashes
>   completely.
> 
>  . Windows has a default limit of 5000 ephemeral ports that can be used
>   fo outgoing connections. This can be changed with the MaxUserPorts
>   registry key. Also, the TcpTimedWaitDelay key is relevant for network
>   performance. Both are described here:
> 
>   http://msdn.microsoft.com/library/en-us/randz/protocol/tcp_time-wait_delay.asp
> 
> I'm now really irritated by this problem. I need a capacity of about
> 15000 concurrent connections for my project. I also have 3 2xXeon
> servers here, but windows (or anything else) doesn't allow more than
> ~8000 connections until it dies.
> 
> -- Michael
> 
> --
> Dipl.-Technoinform. Michael Kleinhenz
> tarent GmbH . Bahnhofstr. 13 . 53123 Bonn
> fon +49 (228) / 52 67 5-0 . fax +49 (228) / 52 67 5-25
> 
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