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From John Turner <tomcat-u...@johnturner.com>
Subject Re: Need help with performance issue - Tomcat 4.1.X
Date Fri, 11 Jul 2003 19:27:52 GMT

In a situation like that, the two things I check first are:

1) DNS lookup failing, especially a reverse lookup..do you have Tomcat 
trying to look up a hostname for access logging, perhaps?

2) database connection timing out

Also, I would look at garbage collection, but I doubt that's it.

John

On Fri, 11 Jul 2003 19:22:41 +0000, <tomcat-question@comcast.net> wrote:

> Yes, these occur internally and externally.  There does not appear to be 
> any network traffic that is causing this (according to the network 
> people...).  We're also seeing this on two different environments on two 
> distinct networks.
>
> After some more digging, there is just NOTHING happening on the machine.  
> Dual CPU, with both cpu's sitting at about 99% idle.  1 GB of RAM, and 
> it's not even being all used.  Tomcat is using about 327MB of RAM with 
> maybe 40(?) threads running.
>
> When I submit my request to get the login page (not to process the login, 
> just to serve the login page), I couple of the java threads will spin up 
> and take maybe 3% of the cpu, but it still takes over 30 seconds to get 
> the page.
>
> Still stuggling for ideas.
>
> -- Dave
>> Are these results occurring when tested on a local
>> area network as well?
>>
>> I have had an issue like that, but it turned out to be
>> a networking issue..not tomcat.
>>
>>
>> --- tomcat-question@comcast.net wrote:
>> > With Tomcat 4.1.x
>> > > We've recently run into an issue where some of our
>> > pages either
>> > a) take a really long time to come up (20+ seconds) >  or
>> > b) come up, but never really finish loading (the
>> > status bar in IE shows the the > response hasn't finished).
>> > > These are very simple pages (for example, a login
>> > page) and our server load is > minimal (maybe 10 concurrent users).  
>> Then,
>> > mysteriously, the problem will go > away by itself.  It will also 
>> return.
>> > > Given the information above, I'm not expecting any
>> > solutions, but I could use > some help steering me in the right 
>> direction with
>> > things to check.  We're > hooking up monitoring on the systems (Linux) 
>> to
>> > examine memory and CPU > utilization during the slowdowns.
>> > > Any things in particular we should be examining to
>> > try to find the problem?  > Any idea why the pages would never fully 
>> return from
>> > the server?
>> > > TIA
>> > > -- Dave
>> > >
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