Why are "single" and "one" located next to each other?
"Every single one" is actually a general expression that means each and every single one of something, without fail or exception. The speaker has used this expression to mean that Linux ranks each of its tasks, and does not leave out a single one. Another related expression is "each and every one." Ex: Every single morning, I drink two cups of coffee. Ex: Each and every one of my brothers is a teacher.