JDK Compressed Oops Compressed oops is supported and enabled by default in Java SE 6u23 and later. In...

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JDK Compressed Oops
Compressed oops is supported and enabled by default in Java SE 6u23 and later. In Java SE 7, use of compressed oops is the default for 64-bit JVM processes when -Xmx isn't specified and for values of -Xmxless than 32 gigabytes. 

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Ensure that the min (Xms) and max (Xmx) sizes are the same to prevent the heap from resizing at runtime, a very costly process.
Don’t Cross 32 GB!
Give Half Your Memory to Lucene
Swapping Is the Death of Performance
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Tiered Compilation; Compressed Oops; Zero-Based Compressed Oops; Escape Analysis; NUMA Collector Enhancements. Tiered Compilation. Tiered compilation, introduced in Java SE 7, brings client startup speeds to the server VM. Normally, a server VM uses the interpreter to collect profiling ...

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