But if you're on 64-bit; you can just create the threads with a huge stack size limit (e.g. 1GB) and let the OS handle automatically growing the actual stack si

But if you're on 64-bit; you can just create the threads with a huge stack size limit (e.g. 1GB) and let the OS handle automatically growing the actual stack size. No need to reinvent the wheel. Stack size is the one area where Windows does have something like "overcommit" by default, as you can separately configure the reserved and commit sizes of the stack: https://learn.microsoft.com/en-us/windows/win32/procthread/thread-stack-size https://learn.microsoft.com/en-us/windows/win32/procthread/t...