Do you mean memory to manage sessions or how much memory is used in a session?
Unmesh, i doubt that you mean how much memory is uses by a session server.So I am going to concentrate on the next version.
Lets see for example.A person loads a page xyz.comLogs in to xyz.com/usermakes a post top xyz.com/posts/blah/xmakes a comment to xyz.com/posts/abc/1does not like the answer from someone else to his post at xyz.com/posts/abc/1 and blogs about it to xyz.com/blogs/userid/
if this is what you mean than its a bit difficult to measure then to measure how much memory is used in creating a session.
Let us know which one do you think it is so we may be able to comment on it.
Get a load simulator, and start measuring your heap size. If nothing else, top(1), prstat(1M), or Windows Task Manager will tell you how big the process(es) is/are.
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