Messages in this thread | | | Date | Mon, 14 Jan 2002 11:16:02 -0800 | From | Rick Stevens <> | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
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Daniel Phillips wrote:
> On January 14, 2002 10:09 am, yodaiken@fsmlabs.com wrote: > >>UNIX generally tries to ensure liveness. So you know that >> cat lkarchive | grep feel | wc >>will complete and not just that, it will run pretty reasonably because >>for UNIX _every_ process is important and gets cpu and IO time. >>When you start trying to add special low latency tasks, you endanger >>liveness. And preempt is especially corrosive because one of the >>mechanisms UNIX uses to assure liveness is to make sure that once a >>process starts it can do a significant chunk of work. >> > > You're claiming that preemption by nature is not Unix-like?
Unix started out life as a _time-sharing_ OS. It never claimed to be preemptive or real time. For those, you waited a while, then got to run MACH. ---------------------------------------------------------------------- - Rick Stevens, SSE, VitalStream, Inc. rstevens@vitalstream.com - - 949-743-2010 (Voice) http://www.vitalstream.com - - - - Change is inevitable, except from a vending machine. - ----------------------------------------------------------------------
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