A few parameters:

From

http://www.oracle.com/technetwork/java/gc-tuning-5-138395.html

Note

The proportion of the heap dedicated to the young generation: The bigger the young generation, the less often minor collections occur. However, for a bounded heap size a larger young generation implies a smaller tenured generation, which will increase the frequency of major collections. The optimal choice depends on the lifetime distribution of the objects allocated by the application.