IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator > Allocation > Large Object Area

Expansion and shrinkage of the LOA

The Garbage Collector expands or shrinks the LOA, depending on usage.

The Garbage Collector uses the following algorithm:

• If an allocation failure occurs in the SOA:
  • If the current size of the LOA is greater than its initial size and if the amount of free space in the LOA is greater than 70%, reduce by 1% the percentage of space that is allocated to the LOA.
  • If the current size of the LOA is equal to or less than its initial size, and if the amount of free space in the LOA is greater than 90%:
    • If the current size of the LOA is greater than 1% of the heap, reduce by 1% the percentage of space that is allocated to the LOA.
    • If the current size of the LOA is 1% or less of the heap, reduce by 0.1%, the percentage of space that is allocated to the LOA.

• If an allocation failure occurs on the LOA:
  • If the size of the allocation request is greater than 20% of the current size of the LOA, increase the LOA by 1%.
  • If the current size of the LOA is less than its initial size, and if the amount of free space in the LOA is less than 50%, increase the LOA by 1%.
  • If the current size of the LOA is equal to or greater than its initial size, and if the amount of free space in the LOA is less than 30%, increase the LOA by 1%.

Parent: Large Object Area

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