> That’s not to be minimized. Sounds like very much on the critical path, and definitely not some shitty infotainment sidecar. If that crashed, you couldn’t control core functions of the sub? Are there overrides?
Sure, it's an important component of the entire system. Much as a steering wheel is an important component of a car, it still doesn't "run" the car. You need to interface, yes obviously; but if the machine crashes the sub operates merrily along like usual and any of the other control computers can continue to give it commands.
As to overrides, if you lost every single control computer and the direct interfaces (the analog control boards you see in crucial areas of naval vessels) then the overall system has a fallback procedure. It's not documented or public knowledge, but assumedly it would surface and activate an emergency beacon as the vessel is crippled (and likely damaged) at that point.
If the goal of such parallel is to show how Linux is more reliable than Windows, then being the steering wheel is sufficient, compared to Windows not being a part of the car at all.
> For UK subs, they run a similar custom OS for the modules and electronics and (until 2017 or so, at least) run Windows XP for their control computers.
Sure, it's an important component of the entire system. Much as a steering wheel is an important component of a car, it still doesn't "run" the car. You need to interface, yes obviously; but if the machine crashes the sub operates merrily along like usual and any of the other control computers can continue to give it commands.
As to overrides, if you lost every single control computer and the direct interfaces (the analog control boards you see in crucial areas of naval vessels) then the overall system has a fallback procedure. It's not documented or public knowledge, but assumedly it would surface and activate an emergency beacon as the vessel is crippled (and likely damaged) at that point.