func writeHeap(w io.Writer, debug int) error {
	return writeHeapInternal(w, debug, "")
}

// writeAlloc writes the current runtime heap profile to w
// with the total allocation space as the default sample type.
func writeAlloc(w io.Writer, debug int) error {
	return writeHeapInternal(w, debug, "alloc_space")
}

func writeHeapInternal(w io.Writer, debug int, defaultSampleType string) error {