IBM FileNet P8, Version 5.2.1            

Improving JRockit response times and CPU utilization

To improve response time and CPU utilization consider tuning the following JVM switches.

Start by using the values that are listed in the examples and then adjust them accordingly.

Table 1. JRockit JVM switches that help to improve response time and CPU utilization
JRockit JVM switch Description
-XXtlaSize Defines the size of thread local areas (TLAs), which are used for object allocation.

The default value is 2 KB.

Format: -XXltaSize:size[k|K] [m|M] [g|G]

For example: java -XXtlaSize:64k

-XXlargeObjectLimit Defines the size of a large object.

Objects that exceed the defined size limit are considered large and are not allocated in TLAs.

Format: -XXlargeObjectLimit:size[k|K] [m|M] [g|G

For example: java -XXlargeObjectLimit:64k

-Xns Defines the nursery size.

Consider setting the JRockit nursery size to 25% of the total heap.

Format: -Xns:size[k|K] [m|M] [g|G

For example: java -Xns:300m



Last updated: March 2016
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