I'm really sad QNX has never been adopted for the desktop and it died with Blackberry for mobile.
Such a cool fast kernel / operating system.
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QNX is a big chunk of Blackberry's revenue. It has found a footing in the automotive industry.
It had a footing in the automotive industry long before Blackberry even existed. Also: process control, medical, avionics, transportation. Anything where latency matters more than throughput.
Fast? Not in the benchmarks I have seen.
In my understanding it promises correctness of scheduling not speed.
When you get down to real-time OSs, jitter often becomes the only metric that actually matters, and raw throughput becomes a means to that end.
Latency >> throughput.
It’s not fast if you want to do batch processing, but if you want fast and predictable responses, it’s quite good.