Experimental Physics and
Industrial Control System

Peter Jemian <[email protected]> · Thu, 25 Aug 2011 16:20:37 -0500 (CDT)

----- 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

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System