put more master to get faster reads 2011/3/22 Pascal Baerten <pascal.baer...@gmail.com>: > by itself, owfs does not actively poll the slaves. it only access the bus to > get the informations queried by the client application (ls, owread, ...) > 1-wire is a slow bus on which many sensors (slave) may be attached. > Discovering every slaves connected and reading theirs state is a relatively > long process that consume time and bandwidth. This may become an issue when > client(s) keep querying owfs for sensor data at too short intervals. > To overcome this, owfs maintain in an internal cache the informations > delivered to the client(s). > Some informations are known to be static because they don't change by itself > (address, type, templow, ...) and other are flagged volatile (temperature, > sensed, count, ...) . > Cache lifetime depends on this volatility. (by default, volatile values are > marked expired 15 seconds after they where collected) That means that owfs > will access the bus to obtain updated values if the cached data is expired, > but this occurs ONLY when a client ask for this data. > > > > > > as most of information is static, > > 2011/3/22 Roberto Spadim <robe...@spadim.com.br> >> >> you should read the directory, or cat the value if using owfs (filesystem) >> to 'poll' the ow network >> >> 2011/3/22 nick <n...@kiwi-hacker.net>: >> >>> My current setup checks outdoor and greenhouse temp to determine >> >>> whether to turn on a 240VAC power switch to heat up (or cool down) >> >>> the greenhouse. owfs polls every 15 seconds? >> > >> >> owfs never poll on itself ! >> > >> > If owfs never polls itself, how does the cached directory structure get >> > updated? Maybe i am misunderstanding something here...? >> > >> > Cheers. >> > >> > >> > >> > >> > ------------------------------------------------------------------------------ >> > Enable your software for Intel(R) Active Management Technology to meet >> > the >> > growing manageability and security demands of your customers. Businesses >> > are taking advantage of Intel(R) vPro (TM) technology - will your >> > software >> > be a part of the solution? Download the Intel(R) Manageability Checker >> > today! http://p.sf.net/sfu/intel-dev2devmar >> > _______________________________________________ >> > Owfs-developers mailing list >> > Owfs-developers@lists.sourceforge.net >> > https://lists.sourceforge.net/lists/listinfo/owfs-developers >> > >> > >> >> >> >> -- >> Roberto Spadim >> Spadim Technology / SPAEmpresarial >> >> >> ------------------------------------------------------------------------------ >> Enable your software for Intel(R) Active Management Technology to meet the >> growing manageability and security demands of your customers. Businesses >> are taking advantage of Intel(R) vPro (TM) technology - will your software >> be a part of the solution? Download the Intel(R) Manageability Checker >> today! http://p.sf.net/sfu/intel-dev2devmar >> _______________________________________________ >> Owfs-developers mailing list >> Owfs-developers@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/owfs-developers > > > > -- > Pascal > www.brain4home.eu > to subscribe, send a mail to <list-subscr...@brain4home.eu> > > ------------------------------------------------------------------------------ > Enable your software for Intel(R) Active Management Technology to meet the > growing manageability and security demands of your customers. Businesses > are taking advantage of Intel(R) vPro (TM) technology - will your software > be a part of the solution? Download the Intel(R) Manageability Checker > today! http://p.sf.net/sfu/intel-dev2devmar > _______________________________________________ > Owfs-developers mailing list > Owfs-developers@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/owfs-developers > >
-- Roberto Spadim Spadim Technology / SPAEmpresarial ------------------------------------------------------------------------------ Enable your software for Intel(R) Active Management Technology to meet the growing manageability and security demands of your customers. Businesses are taking advantage of Intel(R) vPro (TM) technology - will your software be a part of the solution? Download the Intel(R) Manageability Checker today! http://p.sf.net/sfu/intel-dev2devmar _______________________________________________ Owfs-developers mailing list Owfs-developers@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/owfs-developers
