64bit Thread Overhead

Question

What's the overhead of a thread on 64bit windows? I believe it was 1mb of userspace for the stack and a smaller amount of kernel space in 32bit.

Thanks

Answer 1

It can be whatever you want. The CreateThread() API lets you specify stack size. If you call it with a stack size of 0, it will use the stack defined in the executable file header, which can be set via a linker option. The default value (for both x86 & x64 systems) is 1MB.