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0 pointsnikofeyn5y ago0 comments

how is it not an RTOS?

and national instruments and red hat are both large companies that would seem to disagree with you. national instruments has completely replaced pharlap and vxworks in their newer products with their linux real-time OS, so them and their users writing real-time applications would also disagree with you.

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numpad05y ago

See how Red Hat words it? “Red Hat Enterprise Linux for Real Time” not “RHEL RTOS” as if they don’t think Linux is technically not an RTOS. Or maybe they do think that way.

And see that chart down that page? Shows RHEL for RT achieve 3.5 to 85uS variance. I don’t know what application needs it but 80uS is 24km at the speed of light.

LabVIEW is NI’s bread and butter and LabVIEW connects to peripherals via cables and buses. NI not opting for conventional RTOS just means that 80uS errors are probably good enough for their usage.

RTOS also often refers to specific group of lightweight OS and libraries more so than capabilities. People want small no-bullshit runtime, not always a precision scheduler. From that point of view, Linux is just a bloatware towards extreme side so don’t qualify as one.

Overall, no, I still don’t think Linux is RTOS, I don’t think Red Hat says it is, and I think NI just don’t care.

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