(Slightly OT) Telling exactly which objects get promoted

Ben Evans ben.evans at db.com
Thu Apr 8 03:26:27 PDT 2010


Apologies if this is too off-topic, or is covered in a document which my 
Google-Foo has been insufficient to locate so far.

I have an application which is displaying an odd collection pattern on 
large heaps (3G on a 32-bit 6u18). Broadly, all our objects are 
sufficiently short-lived that we don't expect any of them to survive to 
tenure, and yet a small amount of them seem to, so over time we are unable 
to completely avoid full collections.

We would like some tool or JVM setting which would allow us to see exactly 
which objects (or failing that, their classes) are reaching tenure. Can 
anyone suggest something suitable, or some docs?


Ben Evans
GFFX Auto Trading
Deutsche Bank, London
Office: +44 (0)20 7541 3953


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