'How to determine the max number of threads in tomcat thread pool?

I have deployed my application in tomcat 7. I am using the default number of threads in thread pool. When I am running the performance testing for 500 concurrent users the application is not responding. I am using vCPU-8 and 16GB RAM EC2 instance.

Can any one suggest how to decide the number of threads in the thread pool? Also Is it possible to allocate fixed number of threads for a specific url prefixes?

Please note that it is not possible to horizontal scale the infrastructure because of limitations in the framework.

tomcat7


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