Using fine tuning options

You can change the minimum and maximum vales of the free space after garbage collection, the expansion amount, and the garbage collection time threshold, to fine tune the management of the heap.

Consider the description of the following command-line parameters and consider applying them to fine tune the way the heap is managed:

-Xminf and -Xmaxf

Minimum and maximum free space after garbage collection.

-Xmine and -Xmaxe

Minimum and maximum expansion amount.

-Xmint and -Xmaxt

Minimum and maximum garbage collection time threshold.

These are also described in Heap allocation in the OpenJ9 user documentation.