IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator > How to do heap sizing

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 expansion and Heap shrinkage.

Parent: How to do heap sizing

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