Comment Re:Monday morning quarterback: RTOS tradeoffs (Score 1) 386
"Hard real-time software cannot afford to have a complex layered structure and lots of conditional code that adds unpredictable delays."
Vxworks is the worst of both worlds, not only does it not have the memory protection (unless you use AE), but its "hard" real time performance is not so good because system calls cannot be interrupted.
A modern operating system such as INTEGRITY has excellent latency characteristics as well as memory and CPU bandwidth protection...
BTW I am not a salesman for Green Hills, just a humble engineer who recommended them for his embedded PPC project only to be overruled by non software people and ended up with VxWorks... which by the way has done it's job on this project very well. I would still be keen on trying something a little more up to date but overall WRS has come to the party with most major issues, the only problem is you have to ask, and know what to ask, to get a result. They are just as clueless/lazy when it comes to finding problems as you are... unless you are NASA of course.
We never bought FFS though, maybe that was a good decision! hehe
Vxworks is the worst of both worlds, not only does it not have the memory protection (unless you use AE), but its "hard" real time performance is not so good because system calls cannot be interrupted.
A modern operating system such as INTEGRITY has excellent latency characteristics as well as memory and CPU bandwidth protection...
BTW I am not a salesman for Green Hills, just a humble engineer who recommended them for his embedded PPC project only to be overruled by non software people and ended up with VxWorks... which by the way has done it's job on this project very well. I would still be keen on trying something a little more up to date but overall WRS has come to the party with most major issues, the only problem is you have to ask, and know what to ask, to get a result. They are just as clueless/lazy when it comes to finding problems as you are... unless you are NASA of course.
We never bought FFS though, maybe that was a good decision! hehe
