Thus to manage 1000 concurrent requests, the 1000 threads would consume 1GB of the JVM’s RAM just for thread’s stacks. Can anyone explain why this could be an

Thus to manage 1000 concurrent requests, the 1000 threads would consume 1GB of the JVM’s RAM just for thread’s stacks. Can anyone explain why this could be an issue on a 64-bit JVM, assuming these threads only need a small fraction of the 1MB of stack they're allocated? 1GB of address space is nothing on a 64-bit system, and surely the only physical memory that's allocated is what the threads actually use. Does the JVM enforce a limit on virtual allocations, even for its own 'internals' like thread stacks?