Max memory for 64bit Java

Question

What\'s the maximum amount of heap space that one can allocate for java on a 64-bit platform? Is it unlimited?

Answer 1

In theory its between 2^63 and 2^64 bytes.

In practice it is limited by the amount of physical memory and swap space available on your machine. And the physical memory is in turn limited by your chipset (i.e. the number of address pins on the physical memory address bus) and motherboard (i.e. the number and size of the DIMM sockets).