Experimental Physics and
Industrial Control System

Michael Davidsaver <[email protected]> · Mon, 17 Dec 2012 12:29:41 -0500

On 12/17/2012 6:14 AM, Carlos Pascual wrote:

Ronaldo,
Thanks for the tip.

I looked at channel finder docs and I gather that somehow one needs to manually
add the info to the directory itself. I mean, that the channel finder cannot by
itself discover available PVs.

If possible I would like to avoid such requirement of manually creating the
database.

At NSLS2 the process to automatically keep channelfinder up to date is this:

Each IOC init script ends with

dbl > records.dbl
system "cp records.dbl /cf-update/$HOSTNAME.$IOCNAME.dbl"

The two variables are set from the environment by a shell wrapper script

for Linux systems, and manually for RTEMS systems.

The location /cf-update is exported from an NFS server and mounted by

all IOC host systems. The NFS server has a process which monitors for

new/updated files in this directory.

http://channelfinder.hg.sourceforge.net/hgweb/channelfinder/python.channelfinder.api/file/f0d7b9404db3/cf_monitor.sh

When a record list is updated the cf-update-ioc script is run which

handles sending the new information to the channelfinder service.

Once the NFS server has been setup this works fairly well. The ongoing

problem is to ensure that all IOCs create a record listing file. Also,

by design the cf-update-ioc script only adds records, so it a

maintenance task to periodically purge orphaned entries.

Michael

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System