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Chirag,
On 6/12/13 1:01 AM, Chirag Dewan wrote:
> I am facing an Out of Memory Issue with my application. I am using
> Embedded Tomcat 6.0.18. I have a simple servlet deployed which
> does nothing but set the HTTPResponse and return it.
Are you sure you don't trigger session creation?
> Now I have 2 testing clients
>
> Client 1:
>
> HTTPClient 3.1 with MultiThreadedHttpConnectionManager with SSL
> maxConnections = 200 maxConnectionsPerHost=200
>
> Client 2:
>
> HTTPClient 4.1 in which I configured multiple threads
>
> for (int i = 0; i < noofConnections; i++) { Thread t = new
> Thread(my); t.start(); }
What is noofConnections set to?
> With every thread executing HTTPGet on the servlet. This too with
> SSL.
>
>
> Now with client 1,my JVM crashes after just a few minutes. Running
> with 8gb heap space.
>
>
> I took a heap dump for 2gb heap space using Jmap and analyzed it
> with MAT. It seems that there were many instances of
> org.apache.catalina.session.StandardManager consuming almost 95% of
> heap space.
There should only be one StandardManager present per web application
deployed. You only have a single web application? Are you sure that
you have many StandardManager instances, or do you have a single
StandardManager with a huge number of sessions?
> CPU utilization is only 13 -14% and I can see only 65 threads
> active with netstat.
>
>
> With Client 2,everything looks fine. Though JVM crashes at 2gb,but
> at 8gb it works fine. Though CPU utilization is almost 90% and 100
> simultaneous threads created for 100 simultaneous threads.
>
> Both my server and clients are on Linux 64 bit machines.
>
> I believe that this is something related to the client 1 i.e.
> either the HTTPClient 3.1 or the MultiThreadedConnectionManager,but
> posting here if someone can assist me in what might be the root
> cause.
Try a single thread and a single connection. Take a packet-capture and
see what the response headers look like. I wouldn't be surprised if
you are generating a new session with each and every request.
- -chris
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=FOAt
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