InfoCenter Home > 6.6.4.1.4: Tuning containers with the Java administrative consoleThe IBM Redbook SG24-5657-00 is a recommended source of container tuning guidelines. Some tips are excerpted and included in the container property help (section 6.4.1.4.1.4). Although it provides figures for Version 3.0x, the performance tuning Redbook discusses many tuning principles that can be anticipated to apply to Version 3.5. Specific performance numbers and suggested setting values, which have not been verified with Version 3.5, might differ. The book provides guidelines such as the cache size estimation metric that follows. Estimating the cache sizeSizing the cache involves estimating the working set size for the concurrent load to which you expect the application server to be subjected. To determine a rough approximation of the required value for this property, multiply the number of beans active in any given transaction by the total number of concurrent transactions expected. Then add the number of active entity bean instances. For example, an EJB model:
200 x 1 stateful session beans, plus 200 x 5 entity beansIn this case, set your cache to be equal to or greater than 1200. Given the high cost of passivating a bean when the container cache absolute limit is reached, set the container cache and the container cache absolute limit to be larger than the expected load, rather than setting these values too low.
|
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
|