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From Christopher Schultz <ch...@christopherschultz.net>
Subject Re: Configuring limits of requests/sessions/threads in Tomcat
Date Tue, 01 Apr 2014 21:31:49 GMT
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Danilo,

On 4/1/14, 2:03 PM, Danilo Amaral de Oliveira wrote:
> Next week we will deploy a institutional video to all company (more
> than 5k users) in a webpage in an application manges by the Tomcat
> 7.0.40. I have made a stress test through JMeter, simulating a lot
> of simultaneous access, and when the simultaneous access reaches
> 100 users the application stop answering.

What is your expected peak load? If you only need to handle 500
simultaneous users, then you should be fine.

> I would like to know if I can set a max number (80, for example)
> of requests (maxsession or threads, I dunno) in order to configure
> the tomcat to send a warning page advising the user that the server
> is loaded and try again in few minutes if the limits reach the
> maximum value.

You can change the size of Tomcat's request processing pool. That's
either "maxConnections" on your <Connector> or, better yet,
"maxThreads" in your <Executor>.

If you set maxThreads="80", then the 100th request will wait in a
queue. You may get request timeouts at this point, which will be
equivalent to the 100-user situation you describe above.

What you really need is a CDN so your servers don't even handle the
requests at all. Is there a place where you can upload your file that
will be more scalable and/or faster? Something like Amazon S3 maybe?

- -chris
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