Experimental Physics and
Industrial Control System

[email protected] · Mon, 1 Jul 2013 11:54:38 -0700 (PDT)

Hi Bob,

Thank you. I found the page for sddslogonchange. Is there a page for the
PV History Tool as well?

-Patrick

> On 06/28/13 12:25, [email protected] wrote:
>> Hi Emmanuel,
>>
>> Thank you for your reply. I think there may be a difference though. I
>> believe that the SCR applications use snapshots taken at periodic
>> intervals in time? What I had in mind was something that places monitors
>> on the process variables and archives the values only when they change.
>> The queries I described would then be done on that recorded data.
>>
>> MASAR does look like a nice program though.
>>
>> Thank you,
>> Patrick
>>
>>>> store and query data as I have described, but I am wondering if I am
>>>> reinventing the wheel. Does a tool such as this already exist?
>>> Yes.
>>> You are describing a feature of Save/Compare/Restore applications.
>>> SCR are also know as epics-backup application (i.e take a snapshot of a
>>> running machine, compare 2 snapshots, compare a snapshot with the
>>> running
>>> machine)
>>>
>>> You next question is where to get such a piece of software. Well...
>>> I am using SDDS save/compare/restore (very old)
>>> SCORE may have the described feature as well (used at SNS and SLAC)
>>>
>>> <Shameless plug for MASAR>
>>> I am currently looking at MASAR part of epics-4, which is straight
>>> forward
>>> to install, but still in development.
>>> For example, comparisons of 2 snapshots using the pyQt GUI is missing.
>>> A CSS GUI is also a work-in-progress.
>>> At this time, most of the development is at the GUI level
>>> So if you don't mind a text output (i.e. in a terminal), you can use
>>> MASAR
>>> with its python API and have something working by tonight.
>>> </Shameless plug for MASAR>
>>>
>>>
>>>
>>>
>>
> That sounds a lot like our sddslogonchange logger paired with our PV
> History Tool GUI. We have the logger running all the time and recording
> any changes to individual PVs with an optional tolerance level. We can
> then use our PV History Tool to plot the changes and to restore the PVs
> to any given time.
>
> --Bob Soliday
>
>

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System