How is the amount of memory allocated for the stack when a new goroutine is started in Go determined?

In Go, when a new goroutine is launched, its stack is allocated dynamically and starts with a small size (usually around 2 KB). As needed, the stack can automatically expand if the goroutine requires more memory for function calls and local variables.

This allows for efficient memory usage, as a large stack is not allocated upfront, but only as the goroutine's needs grow. The stack management mechanism is built into the Go runtime and is transparent to the developer.

Thus, the memory size for a new goroutine's stack is determined dynamically and starts with a minimal size, which increases as necessary.