Just write a daemon to write to a database as they're read and have the clients read from the database.
C > On Sep 23, 2015, at 5:35 AM, Alex R. Gibbs <agi...@lpl.arizona.edu> wrote: > > Hello, > > We have dozens of DS18B20 temperature sensors at 3 telescopes. I'd like to > poll > them and cache the results so that other programs can retrieve the latest > temperatures with less than 50ms delay. It doesn't matter if the values are > a > few minutes old; just that clients don't have to wait for a response. I am > using owserver 3.1p0 on CentOS 6.5 64bit with a LinkHub-E. > > Is it possible to configure owserver to continuously poll devices on it's > own? > The owserver cache works but of course once a value in the cache expires the > next request for it forces a read of the device, making the client wait about > 800ms. If owserver can be set to poll devices then I can set the expire time > such that this usually never happens. > > I tried having a background program poll the uncached values in owserver more > often than the volatile timeout so that the cached values are never > considered > expired. However, a client still has to wait for a cached value if it is > currently being read out due to an uncached request, even if the cached value > isn't expired. If that was changed I think this would work. > > Any suggestions on how to setup polling so that a client can always get a > cached > value immediately? I have a feeling I'll need to either modify owserver or > write my own server wrapper. > > Thanks, > Alex > > -- > Alex R. Gibbs - agi...@lpl.arizona.edu > Principal Engineer - Catalina Sky Survey > Lunar & Planetary Lab - University of Arizona > -- > > ------------------------------------------------------------------------------ > Monitor Your Dynamic Infrastructure at Any Scale With Datadog! > Get real-time metrics from all of your servers, apps and tools > in one place. > SourceForge users - Click here to start your Free Trial of Datadog now! > http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers ------------------------------------------------------------------------------ Monitor Your Dynamic Infrastructure at Any Scale With Datadog! Get real-time metrics from all of your servers, apps and tools in one place. SourceForge users - Click here to start your Free Trial of Datadog now! http://pubads.g.doubleclick.net/gampad/clk?id=241902991&iu=/4140 _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
