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Can object address help to give me generation info ? [message #1397312]

Wed, 09 July 2014 10:33

Eclipse User

So, I've seen that generation info say even old vs new has been asked for before and that this information is not explicitly in the hprof but if I was say using a collector with fixed region sizes (standard collector)could I in theory guess where an object sits, if I new its address from the hprof.

So say I have half my memory new and fixed, i know my heap size, perm size etc could I use the object address to indicate if that object is in old or new say eg if object address > x say. Though I notice System class loader appears to have address 0.

Re: Can object address help to give me generation info ? [message #1450363 is a reply to message #1397312]

Wed, 22 October 2014 07:10

Eclipse User

I think this could work, provided it wasn't an HPROF agent dump (which doesn't have proper addresses). For HPROF the system class loader is a special case, and has address 0.

Some years ago I did try a query which used object addresses to look for space between objects to assess fragmentation.

Andrew Johnson

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