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Article #1372

Re: realtime application

#1372
From: Sean D. True
Date: Thu, 03 Sep 1992 16:15
23 lines
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In article <Btyt27.JqD@world.std.com> fred@world.std.com (Fred A Putnam) writes:

>If you think you can take a data acq app that is currently running on DOS
>with a 250 Hz interrupt rate, and get two of those to run in real time in
>two OS/2 "DOS boxes", you're mistaken.  The DOS boxes won't run in real
>time at all because they are being time-sliced with each other and with the
>rest of OS/2.  The timer ticks are virtualized, and do not track in real time.

>Sorry, but I don't think this plan will fly..

Unfortunately, Fred is clearly right. A more effective solution might
be to run DOS on a bunch of PC's (even SBCs) and use them to double buffer
into a network file server. A simple semaphore system using the file system
could be implemented without much trouble. The data rate into the network
file server will probably be the limiting step, although you could probably
saturate your available network bandwidth pretty quickly.

Tools to make this easy should be common. They aren't. If you can settle
for programs-in-a-can, LabTech Notebook is pretty darn good.
================================================================
Sean D. True
Rational Systems, Inc.
seant@ratsys.com -- uunet!rational!seant
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Newsgroups: comp.os.os2.programmer
Path: arc1-ca.pugleaf.net!sparky!uunet!ratsys.com!sunfish.ratsys.com!seant
From: seant@sunfish.ratsys.com (Sean D. True)
Subject: Re: realtime application
Message-ID: <seant.63.0@sunfish.ratsys.com>
Sender: usenet@uunet!rational (Network News Desk)
Organization: Rational Systems, Inc.
References: <1992Sep2.064726.6351@nuscc.nus.sg> <Btyt27.JqD@world.std.com>
Date: Thu, 3 Sep 1992 16:15:18 GMT
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