Re: Why is Linux not RTOS?
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On 4/5/07, Raseel Bhagat <raseelbhagat@xxxxxxxxx> wrote:
Hi On 4/5/07, Pradeep <pradeep.annavarapu@xxxxxxxxxxx> wrote: > > > Hi, > > > > Why is Linux kernel considered a (hard) realtime OS? I already > > Linux kernel is never considered a real time OS. > A real time OS should be predictable.The general linux kernel is not > predictable because of many reasons. To ellaborate more, any RTOS HAS TO be deterministic , i.e, it should have a deterministic latecy, a predictable jitter which will never cross its threshold even during heavy loads. > > What stops us from classifying kernel as hard RTOS? Is it because at > > An RTOS is just a facilitator to build Real time systems. A Real time system > developer should analyse a RTOS wether is will be useful for his system. > If some body is holding spin lock and making it non-preemptive its a bad > design. So even a RTOS linux has spin locks. Its the designer who should > take care. Basically , a GPOS (General Purpose OS) is build to optimize the average-response time. Whereas, an RTOS is designed to optimize the worst-case response time. Hence non-RT tasks, in case of an RTOS , are given the least prioirity where as the deadlines for RT tasks are not to be crossed under ANY circumstances. Thanks, Raseel. -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
Why Linux is not RTOS? It was not designed to be a RTOS, thats why. -Pharaoh. - To unsubscribe from this list: send the line "unsubscribe linux-newbie" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.linux-learn.org/faqs