RE: Production server tuning

2003-07-29 Thread john d. haro 
What is the load on your web servers?  Could you repurpose a web server and
load balance the app server instead?  Most of the systems I set up replicate
application servers and come to think of it I almost never get enough load
on a single Apache HTTP server to need more than one box. (I'm speaking
about load and NOT failover).

Sadly I don’t know anything about load balancing Tomcat and I'm usually
doing BEA WL or WAS setups.  I'm here to learn people... don’t flame me.

Here is another couple .02 for you - hindsight is 20/20 but don’t you
performance test before going 'live'?  That is how we 'tune' our systems...
run some serious load tests on your setup in a mirrored QA or staging
environment prior to go-live.  Then watch closely, use a code profiler or
similar tools to see where the bottlenecks are.  Play with the database and
app server configurations... 

Sometimes turning up things like connections will actually seriously degrade
performance for a myriad of other reasons.

Apache JMeter running on several machines is a good load tester.  If you
have the $$ and the project is important enough... we have had great results
from the Compuware suite of products, TrueTime etc.

Good luck

John Haro

-Original Message-
From: Kwok Peng Tuck [mailto:[EMAIL PROTECTED] 
Sent: Tuesday, July 29, 2003 12:47 AM
To: Tomcat Users List
Subject: Re: Production server tuning

I'm no expert in load balancing and stuff like that, but shouldn't you 
load balance tomcat as well ?

Antonio Fiol Bonnín wrote:

 Hello,

 We have already gone live, and we actually spend too much time dead. I 
 hope some of you can help me a bit about the problems we have.

 Architecture:
 3 Apache web servers (1.3.23) behind a replicated load balancer in DMZ
 1 Tomcat server (4.1.9) behind firewall, in secure zone.
 1 Firewall in between.

 Some facts I observed:
 - Under high load, server sometimes hangs from the user's point of 
 view (connection not refused, but nothing comes out of them.
 - Under low load, I netstat and I still see lots of ESTABLISHED 
 connections between the web servers and the Tomcat server.

 For the first case, I reckon I might have found the cause:
 Apache MaxClients is set to 200, and Tomcat maxProcessors was set to 
 something about 150. Taking into account that there are 3 Apache, that 
 means 200 x 3 = 600 clients -- tomcat chokes. Just raised 
 maxProcessors to 601 ;-)

 For the second one, I have really no clue:
 Apache MaxSpareServers is set to 10. I see more than 30 ESTABLISHED 
 connections even with extremely load.

 Could someone point me to either
 - a solution (or part thereof, or hints, or ...)
 - a good tomcat tuning resource
 ?

 I hope I can find a solution for this soon... The Directors are 
 starting to think that buying WebLogic is the solution to our 
 nightmares. They think they only need to throw money at the problem. 
 Please help me show them they are wrong before they spend the money.

 Thank you very much.

 Antonio Fiol



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RE: Help: Server Runtime error

2003-07-28 Thread john d. haro 
System memory of 1gig is good, but your JVM has a default limit so you may
need to increase the heap size for your application.

It will be a command line parameter to the JVM that probably will look
something like -Xmx128m.  Where 128m means - 128 megs of memory for the
heap.

For other issues make sure to read the link that Tim Funk sent earlier...
its true... google is your friend.

Good luck

John Haro

-Original Message-
From: seanssu [mailto:[EMAIL PROTECTED] 
Sent: Monday, July 28, 2003 8:37 PM
To: Tomcat Users List
Subject: Re: Help: Server Runtime error

Tim:

I've checked the system, it has free memory. the machine is IBM M80, 1G RAM

SEAN

- Original Message -
From: Tim Funk [EMAIL PROTECTED]
To: Tomcat Users List [EMAIL PROTECTED]
Sent: Tuesday, July 29, 2003 9:02 AM
Subject: Re: Help: Server Runtime error


 Your out of memory.
 http://jakarta.apache.org/tomcat/faq/memory.html#why

 -Tim

 seanssu wrote:
  Hi,
 
  my system was running on tomcat4.06, which was a MVC structure, Servlet
received requests and send back JSP pages.
 
  after the server running 8hours, I was sent the following errors:
 
 
 
 
  - Root Cause -
 
  java.lang.OutOfMemoryError
 
 
 
  2003-07-06 10:15:18 PageContextImpl: creating out
 
  java.lang.OutOfMemoryError
 
at
org.apache.jasper.runtime.JspWriterImpl.init(JspWriterImpl.java:132)
 
at
org.apache.jasper.runtime.PageContextImpl._createOut(PageContextImpl.java:47
9)
 
at
org.apache.jasper.runtime.PageContextImpl._initialize(PageContextImpl.java:1
46)
 
 
 
  who could give me advice?
 
 
 
  sean
 
 
 
 


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