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- Newsgroups: comp.realtime
- Path: sparky!uunet!zaphod.mps.ohio-state.edu!cis.ohio-state.edu!news.sei.cmu.edu!jbg
- From: jbg@sei.cmu.edu (John Goodenough)
- Subject: Re: real_time systems
- Message-ID: <1992Dec18.145029.3356@sei.cmu.edu>
- Sender: netnews@sei.cmu.edu (Netnews)
- Organization: The Software Engineering Institute
- References: <1992Dec16.213018.12351@linus.mitre.org> <1gpoj4INNi5p@cuda.add.itg.ti.com> <BzEsnz.6nn@cs.uiuc.edu> <BzEvMK.BDM@acsu.buffalo.edu>
- Distribution: comp
- Date: Fri, 18 Dec 1992 14:50:29 EST
- Lines: 33
-
-
- In article <BzEvMK.BDM@acsu.buffalo.edu>, stsai@acsu.buffalo.edu (Shuoh-Ren Tsai) writes:
-
- |> It seems many Industry people are interested in Rate Monotonic Scheduling.
- |> Would anyone out there post some articles about the real IMPLEMENTATION cases
- |> about it?
-
- In a recent USENIX proceedings, SUN wrote about how they were revamping SUN OS
- 5.0 for real-time use by searching out and reducing periods of priority
- inversion. This qualitative use of rate monotonic analysis has proven to be a
- very effective use of the theory by several organizations, most of which have
- not written papers about it.
-
- At the 3rd International Workshop on Networking Support for Digital Audio and
- Video held in San Diego, a paper titled "Real-Time Scheduling Support in
- Ultrix 4.2 for Multimedia Communication" talks about changes in the Ultrix 4.2
- kernel to avoid priority inversion. Another paper, by Roger Needham, "An
- Approach to Real-Time Scheduling but is it really a problem for Multimedia?"
- only talks about which protocol is sufficient to avoid "bad behavior" caused
- by priority inversion and lock blocking. It reaches the conclusion that
- simple priority inheritance "ought to be good enough".
-
- Lynx OS is supporting various rate monotonic scheduling constructs. Some Ada
- compiler vendors provide varying degrees of rate monotonic scheduling support
- (Alsys, Verdix, and DDC-I).
-
- NASA has adopted rate monotonic analysis for Space Station Freedom software.
-
- At least two training companies, Telos and Tri-Pacific, are offering very
- effective training courses on rate monotonic analysis.
-
- John B. Goodenough Goodenough@sei.cmu.edu
- Software Engineering Institute 412-268-6391
-