I think that's a good point. In an OS, many applications (like Web browsers, word processors) are also I/O bound, but you're right, it's an important use-case to support applications that just want to use as much of the CPU as possible. So preemption makes a lot of sense from that perspective alone.
I think even in a world where all applications were I/O bound though, we'd still want the OS to be preemptive - the fragility of any single application being able to break everything just seems untenable.
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I think that's a good point. In an OS, many applications (like Web browsers, word processors) are also I/O bound, but you're right, it's an important use-case to support applications that just want to use as much of the CPU as possible. So preemption makes a lot of sense from that perspective alone.
I think even in a world where all applications were I/O bound though, we'd still want the OS to be preemptive - the fragility of any single application being able to break everything just seems untenable.