Experimental Physics and
Industrial Control System

[email protected] · Thu, 25 Aug 2011 16:24:21 -0700

I am  familiar with the excellent pyepics, but not yet with RDDtools.
Could you please send me a copy of your python and RDD scriptS so I better understand?
Also, I assume you can plot different process variables (from
different RDD db) on the same graph with your framework. Is this
correct?
--
E

On 16:20 Thu 25 Aug     , Peter Jemian wrote:
> 
> 
> ----- Original Message -----
> > I looked at RRDtool.
> > Although that is not a backup utility, that's definitly something I
> > want to use to move away from
> > timeseries using SDDS. (which I also use)
> > Just a question: how do you take a time serie of thousands of PV with
> > rrdtool at one time T?
> > I assume you had to develop a ca plugin/utility, didn't you?
> > 
> 
> Built support for a specific beam line in Python using PyEpics.
> Set CA monitor on each PV.  Python job runs in the background.
> Cron job checks periodically to make sure python job restarts 
> if python job has excepted out.
> 
> The supported beam line has ca. 10^2 PVs which is not the same load as your O(10^3) PVs.  Interesting to try.  In my scheme, each PV gets its own RRD database.  Easier to add new PVs without perturbing the existing ones.
> 
> Pete

-- 
Emmanuel

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System