Compute sizes of classes loaded in perm gen

[Dmitry Samersoff]

Sergei,

Does you need this information for coredump or for live process?

-Dmitry


On 2014-03-19 17:24, Sergei Mihhailov wrote:
> Greetings,
> 
> I’m writing special purpose java agent to compute sizes of classes
> loaded in perm gen. Basically reimplementing some functionality of “jmap
> -permstat”. But in order to do that, I need to get instances of
> InstanceKlass for all loaded classes.
> 
> I’ve looked up PermStat source code, and tried to use it internally in
> my agent using its start() method. This attempt failed :
> “sun.jvm.hotspot.debugger.DebuggerException: Can't attach to the process”
> 
> Is it somehow possible to compute sizes of classes loaded in perm gen?
> 
> 
> Thanks,
> Sergei
> 


-- 
Dmitry Samersoff
Oracle Java development team, Saint Petersburg, Russia
* I would love to change the world, but they won't give me the source code.