Simple math to compute how many http worker you need in tomcat 5.5

Suppose that you know how many users will hit your site hosted by tomcat 5.5 simultaneously, you can use the following math to compute maxThread (http workers) you will need:

MaxThread = 1.5 * Max Concurrent Request + 7

The max thread count gives tomcat a guideline how many worker threads it would create. In reality tomcat will not create these many. If the load proportion reaches 66%, it will insert "connection: close" in the HTTP header to ask client to close the connection. If your browser does not open a new connection for following request, users start seeing errors.