7.6.2 Estimating the memory size of the Eden area in Java heap
The memory size of the Eden area affects the interval between copy GC operations. If the memory size of the Eden area is large, the interval of occurrence of copy GC becomes long. The time taken for the copy GC is affected by the number of objects in use, but is not much affected by the memory size of the Eden area. For this reason, allocate enough memory size for the Eden area to prevent a frequent occurrence of the copy GC. This is effective for improving performance.