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Java can address 32GB heaps with compressedoops flag enabled. After that flag is off, you can address as much as 64 bits will allow. http://stackoverflow.com/questions/2093679/max-memory-for-64...

Do a little research before implying that there's no way that Java can address gigantic heaps.

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You can but garbage collection will kill your performance for very large heaps. You either end up needing to use off heap memory to take it out of scope for garbage collection or using many small JVMs with more reasonable sized heaps.

I wasn't implying or assuming anything, I was genuinely asking... I'm more familiar with windows, than other OSes, but iirc, windows apps can only get 4GB per process. (Maybe that was just 32bit windows apps).

I was incorrect... Then again, I've never needed to address more than a couple gb of ram.

[1] http://stackoverflow.com/a/11892191/43906

Just 32bit apps. 64bit apps can go much higher.

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