If you know you only need a small amount of stack size, you can set the stack size to be small via the task builder: http://doc.rust-lang.org/master/std/task/struct.TaskBuilder....

Thanks for the link. But what if I don't know the stack size in advance? I guess the model with a stack that starts small and grows on demand is only possible with M:N scheduling, not with 1:1 native scheduling?