Manoj Apte wrote: > > Paul, > > Good to see someone in the industry talk in terms of time based > scheduling. I have been working on developing a time driven scheduler for > a message passing library (MPI/RT) on rtlinux. MPIRT requires time > driven support, and I couldnt find ANY operating system that had that > built in, (except RT-Mach.. but it is.. Mach.) RT-Linux had the EDF > scheduler by Ripoll. I started from that and am modifying it to be > more like the Mach resource reservation model. > > One of the few people I talked to, who are in the RTOS industry, said > their customers never ask for time-based, so they dont bother. So do you > guys actually use time based scheduling? What embedded OS allows you > to schedule according to prescribed deadlines, and worst case compute > times to be able to give guarantees against failure? Who measures worst > case compute times for the rt tasks ?.. how? > :) > > lotsa questions > > Manoj > > ============================================================================== > _|_ > MANOJ APTE -----------(o)----------- 500 Louisville St, #59 > High Performance Computing Lab Starkville, MS 39759 > phone: (601) 325 7503 phone: (601) 323 8160 > > Engineering Research Center. email: [EMAIL PROTECTED] > phone: (601) 325 2476 http://www.erc.msstate.edu/~manoj > ============================================================================== > > --- [rtl] --- > To unsubscribe: > echo "unsubscribe rtl" | mail [EMAIL PROTECTED] OR > echo "unsubscribe rtl <Your_email>" | mail [EMAIL PROTECTED] > ---- > For more information on Real-Time Linux see: > http://www.rtlinux.org/~rtlinux/ Custom RTOS's used in defense and telephony often consider time. A telephony RTOS used by the fastest tandem switch in existence is a message engine which does time based scheduling. In my opinion, the RTOS vendors may be mistaking the fact that people like off-the-shelf protocol, board and device support for an endorsement of their scheduling or message passing technology. When most folks buy an RTOS, they are looking to buy time-to-market. THey are typically sold a tool chain, including compiler and debugger, training, and a maintenance contract. They also know that they can go and hire employees or consultants experienced in that environment. In telephony, the availability of ( often third party supplied) protocols like TCP/IP, x.25, h.323, etc. mat be more of a driving force than scheduling throughout most of the ( less-time critical) parts of the system. Aren't there some time based schedulers for ChorusOS? Chorus is still used by Alcatel, Lucent, and several other big telecom companies on existing products, and is being re-packaged by Sun as a real-time platform for embedded Java. -- Alcatel USA Internet: [EMAIL PROTECTED] 1000 Coit Road Plano, Texas 75075 **** The opinions expressed are not those of DSC Communications, Inc. **** "Keep things as simple as possible, but no simpler". A. Einstein -- Alcatel USA Internet: [EMAIL PROTECTED] 1000 Coit Road Plano, Texas 75075 **** The opinions expressed are not those of DSC Communications, Inc. **** "Keep things as simple as possible, but no simpler". A. Einstein
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