Some of the parameters are ratios of one part of the heap to another. See the section Parallel Collector Ergonomics in Sizing the Generations for details on heap resizing and default heap sizes with the parallel collector. The default size is often too small. The most important factor affecting garbage collection performance is total available memory. At each garbage collection, the virtual machine chooses a threshold number, which is the number times an object can be copied before it is tenured. Increase the young generation size as you increase the number of processors, because allocation can be parallelized.
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