From mboxrd@z Thu Jan 1 00:00:00 1970 X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on polar.synack.me X-Spam-Level: X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00 autolearn=ham autolearn_force=no version=3.4.4 X-Google-Language: ENGLISH,ASCII-7-bit X-Google-Thread: 103376,348865ddb50d3a12 X-Google-Attributes: gid103376,public X-Google-ArrivalTime: 2002-04-05 14:05:58 PST Path: archiver1.google.com!postnews1.google.com!not-for-mail From: dennison@telepath.com (Ted Dennison) Newsgroups: comp.lang.ada Subject: Re: Glade :- he distributed Annex Date: 5 Apr 2002 14:05:57 -0800 Organization: http://groups.google.com/ Message-ID: <4519e058.0204051405.531c0f88@posting.google.com> References: <3cab031b@filemon.telecable.es> <4519e058.0204050615.4f133f1f@posting.google.com> <7vit76kth4.fsf@vlinux.voxelvision.no> NNTP-Posting-Host: 65.115.221.98 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit X-Trace: posting.google.com 1018044358 26149 127.0.0.1 (5 Apr 2002 22:05:58 GMT) X-Complaints-To: groups-abuse@google.com NNTP-Posting-Date: 5 Apr 2002 22:05:58 GMT Xref: archiver1.google.com comp.lang.ada:22164 Date: 2002-04-05T22:05:58+00:00 List-Id: Ole-Hjalmar Kristensen wrote in message news:<7vit76kth4.fsf@vlinux.voxelvision.no>... > dennison@telepath.com (Ted Dennison) writes: > > Considering that TCP itself can't be used for that kind of real-time > > application (and IP itself can't either, except under certian > > circumstances), that's a pretty safe statement. > On the other hand UDP/IP is perfectly good enough to run fault tolerant > *soft* real time systems in a workstation cluster. In other words, good enough > for a telephone company, but don't try running your engine controller on it. Mostly. As I alluded to, it *can* be used for hard real-time, under some very specific circumstances (dedicated direct link, with no other applications using it, no outside traffic forwarded onto it, and a RT IP stack). The main non-determinisim in IP comes in with the collision/retry mechanisim, and with routing issues. We did this with the last simulator I worked on. It allowed us to use a well-known API, and industry standard PC's. It would have made the whole thing damn cheap, if it weren't for the >$200K of custom hardware we had to drive. :-) -- T.E.D. Home - mailto:dennison@telepath.com (Yahoo: Ted_Dennison) Homepage - http://www.telepath.com/dennison/Ted/TED.html