Experimental Physics and Industrial Control System
Subject: |
Re: Open source Real-time Oss / open source OS |
From: |
Andrew Johnson <[email protected]> |
To: |
EPICS Core Talk <[email protected]> |
Date: |
Fri, 10 Jun 2005 10:45:41 -0500 |
NB: This is now a core-talk thread, not tech-talk...
Ralph Lange wrote:
Real time OS problems are no different than other OS problems in terms
of how and why (not) EPICS is running. It's the same OSI layer that has
to be implemented for a new OS.
Dalesio, Leo `Bob` wrote:
It seems that we are diverging on these. It is a little worrisome, as
operating system problems are ones that are very difficult to find and
fix. It would seem most efficient to limit the number of these that we
employ.
This may be somewhat idealistic of me, but...
This is exactly the reason why for quite a while I have been wanting us
to have an _automated_ regression test suite. There should be a whole
series of tests that we can run with one command which checks out that
the OSI layer for the platform it's running on does everything that
iocCore expects it to do, and gives an overall pass/fail result at the
end. (R3.14's libCom/test programs fail several of these requirements
for a test suite.)
Someone who is porting EPICS to a new OS should just have ensure their
code passes that test suite and (if we have sufficient test coverage)
they can be reasonably confident that both iocCore and the CA libraries
will run on the new OS. If they find a problem running EPICS on their
new OS that wasn't caught by our tests, we obviously missed something in
our test coverage or assumptions, and need to write another test to
catch that problem.
That's the theory. In practice, once we've found a problem we tend to
just fix it, and not think about it any more. I guess it's really a
question of the effort involved - there's more effort and pressure to
get something working than there is to ensure it won't happen again for
someone else. This is why commercial companies (and probably NIF too)
employ as many testers as they do, but I don't really expect we'll ever
get that kind of resource level available to us.
Sorry, I guess I'm not really expecting anyone to respond to this, just
forget I ever wrote it...
- Andrew
--
Podiabombastic: The tendency to shoot oneself in the foot.
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- RE: Open source Real-time Oss / open source OS Jeff Hill
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