Re: Latency and Tomcat 3.2.4

[Pete Helgren <Pete@xxxxxxxxxx>]

Robert,

We use Tomcat 5.0.28 and haven't experienced this.  It has been a while 
since we ran the 3.x version.  Is this the "original" supported version 
of Tomcat or did you install it from the Apache web site?  We always 
have an initial lag when starting a servlet based application because I 
understand that it recompiles when it first loads after starting 
Tomcat.  But, once Tomcat has been started and the application has been 
accessed at least once, the next request is handled quite fast, even 
days later.

I don't know if there is a setting for having an application "unload" 
from memory, especially in Tomcat 3.x.  We have been very satisfied with 
the 5.x release.

Pete Helgren


rbyrne@xxxxxxxxxxxxxxx wrote:
> Hi,
>
> I've been looking into Tomcat on the iSeries for the past couple of 
> months. I've successfully migrated a small IIS application we use in house 
> to Tomcat rewriting it with Java/Jsp using the Struts framework. I stress 
> tested the application and the results where great i.e. circa 100ms for a 
> response. We put the application into pilot production. What we noticed 
> was that due to the infrequent use of the application initial requests had 
> a very poor response time however subsequent requests were fine. So in 
> essence if the application was left idle for a period analysis has shown 
> that the idle interval doesnt necessarily have to be a long one, the 
> initial request is slow, so there is a lag. 
>
> I've been trying all sorts to try and minimize/elimate the lag by 
> adjusting priorities, running tomcat inprocess/out of process, setting up 
> a seperate memory pool for my http instance. Our iSeries has automatic 
> tuning switched on and is tuned heavily for interactive. I've been told by 
> our iSeries admin that switching the automatic tuning off is not an 
> option.
>
> I would like not having to resort to leaving a stress test running 
> constantly to keep the application responding.
>
> I'm wondering if anyone has seen the following behaviour of if anyone can 
> suggest an explanation/solution.
>
> Thanks and kind regards,
> Robert.
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