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    <p>I don't think there's an out of the box answer to this question. This depends heavily on what kind of applications you are going to host and how much is it going to be on your system. I administer a small server with 3-4 applöications on a 64bit linux system. Using 4GB is more than enough for me. </p> <p>My advise is make a wild guess how much ram is required for your applications. Then startup tomcat with a monitor tool then watch how much load is there on your tomcat. You might have allocated too much resource for tomcat. Maybe too few. you never know</p> <p>Please read this article on <a href="http://www.tomcatexpert.com/ask-the-experts/simultaneous-users" rel="nofollow">Simultaneous users</a>, and also the article about <a href="http://people.apache.org/~mturk/docs/article/ftwai.html" rel="nofollow">load balancing in tomcat</a></p> <p>Basically you have to differentiate between users and requests. you might have 5000 users browsing your site, but only 100 making requests for a new page at one moment. By default tomcat supports 50 concurrent requests (not 100% sure though). But this number can be changed in your tomcat configuration. Obviously you might need more hardware. In the second article, max 200 requests per tomcat instance is recommended. only simple calculation rules as mentioned in the second article and doing some monitoring can help. </p> <p>There's even a load balancer manager for tomcat. Check it out <a href="http://tomcat.apache.org/connectors-doc/generic_howto/loadbalancers.html" rel="nofollow">load balancer for tomcat</a></p> <p>One more thing to think of, is although you have the hardware and the right load balancing to support 5000 users, you also need enough bandwidth to do so. Again explained in the second article "load balancing in tomcat"</p> <p>Good luck</p>
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    1. COI posted detailed requirement and questions in another thread and that thread got closed :( Anyways ... It would be helpful if you tell how much % of RAM can be kept for JVM memory on a 64 bit Linux system. I have got answers like not more than 70% of your physical RAM or 70% of the remaining after subtracting your OS memory etc. What is your suggestion ? Also, how that will map to number of maximum threads of tomcat ?
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    2. COMy ultimate goal is to support 5000 concurrent users. Depending on above calculations, I will calculate how many web servers I should add under a load balancer.
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    3. CO5000 concurrent users with one application server, do you use AIX machine? <br>I do not think one machine can support so many requests, unless your app serve is simple.
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