IBM User Guide for Java V7 on Windows > IBM SDK for Java > The collector and the allocator

Allocation

The Allocator is a component of memory management that is responsible for allocating areas of memory for the JVM. The task of memory allocation is small, compared to that of garbage collection.

• Heap lock allocation
  Heap lock allocation occurs when the allocation request cannot be satisfied in the existing cache.
• Cache allocation
  Cache allocation is specifically designed to deliver the best possible allocation performance for small objects.
• Large Object Area
  The Large Object Areas (LOA) is an area of the tenure area of the heap set used solely to satisfy allocations for large objects. The LOA is used when the allocation request cannot be satisfied in the main area (also known as the small object area (SOA)) of the tenure heap.
• Compressed references
  When using compressed references, the JVM stores all references to objects, classes, threads, and monitors as 32-bit values. Use the -Xcompressedrefs and -Xnocompressedrefs command-line options to enable or disable compressed references in a 64-bit JVM. Only 64-bit JVMs recognize these options.

Parent: The collector and the allocator

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