Raghu Angadi wrote:
Suresh had made an spreadsheet for memory consumption.. will check.
A large portion of NN memory is taken by references. I would expect
memory savings to be very substantial (same as going from 64bit to
32bit), could be on the order of 40%.
The last I heard from Sun was that compressed pointers will be in very
near future JVM (certainly JDK 1.6_x). It can use compressed pointers
upto 32GB of heap.
It's in JDK 1.6u14. Looking at the source and reading the specs implies
there is savings, but we need to experiment to see. I now know how to do
sizeof() in java, (in the instrumentation API), so these experiments are
possible
I would expect runtime over head on NN would be minimal in practice.
I think there's a small extra deref cost, but its very minimal; one 8
bit logical shift left, possibly also an addition. Both of which run at
CPU-speeds, not main memory bus rates
