JDK-6479360 : RFE: PrintClassHistogram improvements
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Affected Version: 6
  • Priority: P4
  • Status: Closed
  • Resolution: Won't Fix
  • OS: generic
  • CPU: generic
  • Submitted: 2006-10-06
  • Updated: 2019-12-04
  • Resolved: 2014-01-29
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JDK 8 Other
8Fixed hs25Fixed
Related Reports
Relates :  
JDK-8232759 - Remove GC.class_stats
Relates :  
JDK-8168305 - GC.class_stats should not require -XX:+UnlockDiagnosticVMOptions
Description
Requested improvements for PrintClasshistogram:

1) print loaded classes grouped by class loader
2) distinguish between Class Object and instances
of the class (they have the same name)
Comments
Will not backport this, closing as WNF
29-01-2014
The JDK8/hs25 version is based on NPG code. Backport to JDK7 requires extensive changes.
26-03-2013
The fix is committed into jdk8: http://hg.openjdk.java.net/jdk8/jdk8/hotspot/rev/16fb9f942703
18-03-2013
Sample outputs jcmdfoo -help > ver_010_help.txt jcmdfoo > ver_010_hello.txt jcmdfoo -csv > ver_010_hello.csv jcmdfoo -all > ver_010_hello_all.txt jcmdfoo -csv -all > ver_010_hello_all.csv A list of all the columns and their meanings are in the attached file ver_010_help.txt.
17-01-2013
The PrintClassHistogram option is not easily accessible by the user and cannot be easily changed once the VM is started. Also, it is not easy to be used to print out class information "at the right time". Instead, I propose to add a new "jcmd" diagnostic command to print out a superset of the information that's currently printed by PrintClassHistogram. See attachment: class-stats-proposal.2.txt
02-01-2013
Proposal: Dumping of Extended Class Size Statistics v0.2 - 2013/01/01 Ioi Lam (ioi.lam@oracle.com)
02-01-2013