JVM Memory HTTP Session Sizing Worksheet

Use the HTTP Session Sizing worksheet to estimate the JVM memory required to support HTTP sessions. Please see Chapter 6 for a complete description of the data and calculations in the worksheet. Also, see Chapter 10, Case Study: Preparing to Test, for an example using this worksheet.

Input Data

	Input Data	Source of Data	Your Data
1.	User arrival rate (in seconds)	Capacity Sizing worksheet, line 11
2.	Average user visit time	Capacity Sizing worksheet, line 5
3.	Planned HTTP session timeout interval (in minutes)	System administrator
4.	HTTP session size (per user)	Network Capacity Sizing worksheet, line 7

Calculating HTTP Session Memory Requirement

	Calculated Data	Calculation	Total
5.	Average time user session stays resident in memory (in minutes)	Average user visit time + Session timeout Line 2 + Line 3
6.	Number of user sessions in memory	User arrival rate * Average time session in memory Line 1 * Line 5
7.	HTTP session memory required	Number of user sessions in memory * HTTP session size Line 6 * Line 4