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Max Min Heap size for java

Q:   Minimum and Maximum Heap size ? Hi Friends, Can someone let me know like the minimum and maximum sizes required ? I mean ,  What's the default minimum and maximum heap sizes (should we assign) for a 32-bit  operating system  ? What's the default minimum and maximum heap sizes (should we assign) for a 64-bit operating system ? Assume my operating system was LINUX. thanks. A:  Minimum and Maximum Heap size ? "Suppose say , if we observe lots of "FULL GC" occurring frequently.. What does this mean ?" That the maximum heap space is reached frequently. Another  question  that arises as well, what type of application are you dealing with. Is this an application that users are using, or is it an application that processes batches or something similar. In the first case you might want to check if you experience high pause-times due to these garbage collections, you could give the garbage collector some hints in what pause...