Session creation statistics are only displayed in perfdump. Following is an example of the statistics displayed:
SessionCreationInfo: ------------------------ Active Sessions 1 Total Sessions Created 48/128
Active Sessions shows the number of sessions (request processing threads) currently servicing requests.
Total Sessions Created shows both the number of sessions that have been created and the maximum number of sessions allowed.
Reaching the maximum number of configured threads is not necessarily undesirable, and you do not need to automatically increase the number of threads in the server. Reaching this limit means that the server needed this many threads at peak load, but as long as it was able to serve requests in a timely manner, the server is adequately tuned. However, at this point connections will queue up in the connection queue, potentially overflowing it. If you check your perfdump output on a regular basis and notice that total sessions created is often near the RqThrottle maximum, you should consider increasing your thread limits.
You can increase your thread limits by: