Re: Tomcat stops responding due to too many requests - using Jackrabbit

[Marcel Reutegger <ma...@gmx.net>]

Hi,

please try to get a thread dump from the jvm when tomcat does not
respond. using suns jdk 6 you can use the following tools:

jps (will give you the ids of your java processes)
jstack <pid> (gives you the thread dump)

that will help to analyze what causes the slow down.

regards
 marcel

On Thu, Nov 12, 2009 at 02:40, rokham <so...@gmail.com> wrote:
>
> Hi,
>
> I've written a web application using Jackrabbit. I have Tomcat as my web
> server and I'm having a strange problem when a large number of requests are
> sent to Tomcat simultaneously.
>
> Here's the scenario:
>
> When I have about 7 people accessing the server and sending about 10-15
> requests at a time, the server starts off very strong and keeps going for
> about 5 minutes (Each of the 7 people sends 3-4 batches of requests over
> those 5 minutes. This means in 5 minutes we have 7 people sending about 50
> requests each. Therefore a total of 350 requests). After the 5 minutes the
> sever slows down and about 2-3 minutes after doing the same routine, Tomcat
> stops responding.
>
> I was monitoring the system and the CPU was calm and the memory was running
> at about 100 MB. But it's really strange that Tomcat stops responding even
> though the server is not doing anything. And it's not like the request has
> timed out. No error msg or anything is sent back from Tomcat.
>
> I'm using Jackrabbit as my DB and I'm having a really hard time spotting the
> problem. I don't know if I need to tweak tomcat's configs, or something in
> Jackrabbit or is it something with Tomcat and Jackrabbit talking to each
> other, that I need to know about.
>
> I came across the post below and the line saying It is caused by an in
> accessible data base.  made me wonder if there's a glitch between tomcat and
> jackrabbit.
> http://www.mail-archive.com/tomcat-user@jakarta.apache.org/msg158745.html
>
> Thank you in advance. Any help is much appreciated, since I need to have the
> system ready in a week.
>
>
>
> --
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>