JDK-6857194 : Add hotspot new perf counters to aid class loading performance measurement
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 7
  • Priority: P4
  • Status: Closed
  • Resolution: Fixed
  • OS: generic
  • CPU: generic
  • Submitted: 2009-07-02
  • Updated: 2010-04-02
  • Resolved: 2010-01-15
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JDK 6 JDK 7 Other
6u18Fixed 7Fixed hs16Fixed
Related Reports
Relates :  
Relates :  
Add new perf counters to understand class loading cost and how the class data sharing impacts the startup time.

1. time spent in defining system classes (shared and non-shared)
2. time spent in defining app classes
3. exclusive time in clinit, class linking, and verification.

EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-rt/hotspot/rev/6a93908f268f

EVALUATION Instrument the class loading path and add a few perf counters for performance measurement.