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The Free Memory Contribution pie chart gives a graphic overview of how the free memory is distributed in free blocks of different sizes on the Java heap. The table below the pie chart (Figure 10-3) lists all block sizes by category.
The block sizes are categorized by the following entities: small, medium, large, and very large. The block sizes are multiples of the minimum block size set at startup (default 2kB). You set the minimum block size with the option -XXminblocksize.
Below are the multiples used for the different block sizes:
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