IBM 6.1.X manual S E S S I O N T I M E O U T, W E B C O N T A I N E R T H R E A D P O O L S I Z E

S E S S I O N T I M E O U T

Session timeout: The default value of Session Timeout is 30 minutes. Reducing this value to a lower number can help reduce memory consumption requirements, allowing a higher user load to be sustained for longer periods of time. Reducing the value too low can interfere with the user experience.

For Solaris, on a T5240 hardware, we used a much lower think time, 5 seconds, than was used for other platform hardware measurement of 12 seconds. With a lower thinktime, fewer vusers will result in a heavier load on the system. The reason we lowered the thinktime was specifically to decrease the number of vusers required for this measurement. Our pool of LoadRunner vuser licenses was inadequate to generate enough load with the higher think time. With a shorter think time than is used in the other measurements, the duration of each virtual user's interaction with the site is shorter by approximately 2 minutes. To compensate for this, and keep the sessions live on the server for the same period of time, we increased the session timeout by 2 minutes, to 12 minutes.

How To Set: In the WebSphere Administrative Console: Servers ￿ Application Servers ￿

WebSphere Portal ￿ Container Settings: Web Container Settings ￿ Session Management

￿Session Timeout -> Set Timeout

Parameter	AIX	Linux	Solaris	Windows	z/Linux	z/OS
	POWER5			2003
Session	10 minutes	10 minutes	12 minutes	10 minutes	10 minutes	10 minutes
timeout

W E B C O N T A I N E R T H R E A D P O O L S I Z E

Servlet engine thread pool size: Set this value and monitor the results. Increase this value if all the servlet threads are busy most of the time.

How To Set: In the WebSphere Administrative Console: Servers ￿ Application Servers ￿

WebSphere Portal￿ Additional Properties: Thread Pools￿ Web Container ￿ Thread Pool - Minimum size threads - Maximum size threads

Parameter	AIX	Linux	Solaris	Windows	z/Linux	z/OS
	POWER5			2003
Web Container	50	50	50	50	50	50
Thread pool
size

9

W E BS P HE R E P O R T AL V 6 . 1 T U N I N G G U I D E