Experimental Physics and
Industrial Control System

quock <[email protected]> · Sun, 13 Sep 2009 08:48:35 -0500

Hi Noboru,

The beauty of storing information about EPICS PVs (along with IOC

architecture, installed controls hardware, etc.) in a relational

database is that it allows one to easily track the history of an IOC's

configuration such as when new PVs were added to an IOC and when PVs

were deleted from an IOC.

EPICS-IRMIS workshops held over the past few years have drawn much

interest, support and collaboration from several accelerator facilities

(CLS, SLAC, BNL, MSU-NSCL and more). An IRMIS workshop was held this

past spring at Brookhaven National Laboratory and was led by Gabriel

Carcassi. Gabriel and I will both be attending the ICALEPCS 2009

conference, perhaps Gabriele and I can arrange a side-session meeting or

an evening meeting to discuss future enhancements for IRMIS and recent

updates to IRMIS version 3 sometime during the week of the ICALEPCS

conference.

Debby Quock
Controls Group
Advanced Photon Source
Argonne National Laboratory

Noboru Yamamoto wrote:

Hi,

Patrick Thomas wrote:
> Hi,
>
> I was wondering if there was anyway to get a list of all the process
> variables currently loaded in all the IOCs. I read that when a request

> for a particular process variable is made, each IOC gets the request

and

> has to look in its databases to see if it contains it. Is it

possible to

> instead have it return all the process variables it does have?
>

> I was also wondering if anyone has had trouble getting the sound to

work

> when compiling the alarm handler on Linux?
>
> Thank you,
> Patrick

A thread in TechTalk titled "Listing channels” by David Dudley dated

May 06, 2008 and responces may also help you.

In these responces, I reporeted my device support for waveform record:
devWfDbRecfection

 1. A device support for waveform record. It get a list of record

types/fields of specified record/name of reocrds from EPICS DB using

dbStaticLib.

 2.Now Supports CHAR and UCHAR as FTVL. It returns comma separated

list of informaiont as char array.(2009.3.20)

and tar.gz file is available at:
  http://www-acc.kek.jp/EPICS_Gr/products/Records/DbReflectionApp.tgz

To achieve your goal, you need to install records using this device

support in ALL IOCs you have.

Alternatively,

You can use dbDumpRecord and dbDumpRecorType commands,or just "dbl",

in iocsh to dump those information to a file. Again you need to add

these command(s) in every st.cmds in your system.

If you can safely assume you know the location of all start-up command

files of running IOC, a PV Crawler can find all records in your system.

In this case, we also assume that database files used in the start up
commands have not changed since last reboot of IOCSH.

Anyway, It is interesting that this kind of question raised several

times in TechTalk, and several different solutions were shown. Doesn't

it means we need to do something in the Collaboration, "provide FAQ on

this subject" or "Define new protocol

to retrieve these information" for examples?

Regards,

Noboru Yamamoto
J-PARC control group/J-PARC center(KEK & JAEA)
EPICS group/KEK
JAPAN

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System