UseCompressedOops switch with more than 32gb heaps...

atulksh atulksh at
Thu May 27 17:58:17 UTC 2010

We are currently running our application servers with 26Gb of heap and have
the UseCompressedOops enabled for memory savings. We are intending to boost
the memory on our servers more, in which event, we would be bumping the heap
above 32Gb. I know that the UseCompressedOops switch works only if you have
a heap of 32Gb or less.

Is there anything in the Hotspot VM roadmap where there may be support of
heaps larger than 32Gb, and still using the UseCompressedOops switch for
memory optimization (32 bit object pointers within the heap)? Or is this
question irrelevent - meaning there is no possibility to have such a support
on the 64 bit machines?

Thank you for your response in advance.

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