When you say "zero caching" -- how do you accomplish that? (It would help
with debugging).
Paul Alfille
On Fri, Sep 10, 2010 at 5:02 AM, Molnar Domokos <[email protected]> wrote:
> Hi,
>
> I have just read the thread *owfs-mounted directory fails first time after
> inactivity
> period<http://sourceforge.net/mailarchive/message.php?msg_name=4C7825D1.2070809%40chapus.net>
> *and may have something related to it.
>
> I have been running owfs lights out to control my HVAC at home for about 3
> years, I have switches and temp sensors on it, and it works in "real time"
> so I had to resolve the stability issue with programming around.
>
> My HVAC controller reads the temperature of the furnace in a loop as it
> needs to act fast on temperature changes by switching on/off the gas burner
> and water pumps and magnetic valves. As a result I have a fair bit of
> experience with the stability of owfs.
>
> It is not very stable so I my controller does the following:
> Level1: The code catches the read/write exception of owfs provided files
> and retries max. 10 times, if does not succeed then
> Level2: Kills owfs with -9, umounts /mnt/1wire and restarts owfs
> If Level2 error happens it logs the event.
>
> Level1 error happens about every other day, while Level2 happens less
> frequently but it really is random.
>
> Here is the log for Level2 events from 1st of August this year. As you can
> see sometimes it goes on for 10, even 20 days w/o Level2 errors, then it
> just happens. Nothing changes in the usage pattern of the network or the
> controller, all sensors are continuously read, and all PIOs are written.
>
> The exceptions are mostly "No such file or directory" but sometimes
> "Software caused connection abort" happens too.
>
> It runs on a CentOs 5.4., with owfs 2.7p39, with zero caching as I need the
> new values every time.
>
>
>
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