Experimental Physics and Industrial Control System
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
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