Java SE 6 Update 14 Performance Improvements – One Not Free
Sun has just released Java SE 6 Update 14 with some great performance improvements.
- Optimization Using Escape Analysis :
[-XX:+DoEscapeAnalysis]
HotSpot will look for objects that are created and reference by a single thread and omit allocation treating them like local variables. - Compressed Object Pointers :
[-XX:+UseCompressedOops]
Improves 64-bit JRE performance by compressing object references to 32 bits when the object heap is less than 32 GB. - Garbage First (G1) Garbage Collector :
[-XX:+UnlockExperimentalVMOptions -XX:+UseG1GC]
A low pause, server style collector that is more predictable. - Improved TreeMap Iteration :
[-XX:+AggressiveOpts]
Improved iteration for frequent passes over TreeMaps when the option is turned on.
Release notes indicate though that to use the G1 garbage collector in production, a Java support contract must have been purchased. I guess Oracle is starting to make its mark on Sun.
Posted under Java Virtual Machine, Performance, Sun, Update
This post was written by robert.casto on May 29, 2009
