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 :  
JDK-6959965 - jstat: Add new -classload option to print class loading statistics
Relates :  
JDK-6966589 - hs16-b08 causes java.lang.StackOverflowError
Description
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.
Comments
EVALUATION http://hg.openjdk.java.net/jdk7/hotspot-rt/hotspot/rev/6a93908f268f
10-07-2009
EVALUATION Instrument the class loading path and add a few perf counters for performance measurement.
02-07-2009