[vinkelhake]

That's true, but the majority of those 64-bit servers only have a 48-bit address space to millions of gigabyte-sized stacks would still be a tight fit.

[alexlarsson]

Obviously it would be a "virtual" gigabyte-size stack. I.e. it would be mmapped, but all the threads would not actually be using all their stack. Physical memory is not allocated, but virtual addresses are.

[dbaupp]

One can only fit 2^18 == 262144 stacks with size 1GiB into the 48-bit x86-64 address space (i.e. 48 bits is the total virtual address size).

[zokier]

Isn't 1GiB stack quite huge? I would have excepted them to be like order of magnitude smaller.

[noselasd]

Yes, it's huge. C programs on linux normally defaults to a 8 or 10 MB stack per thread, and that is considered huge by many.