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<== Date ==> <== Thread ==>

Subject: RE: Listing channels
From: "Jeff Hill" <johill@lanl.gov>
To: "'David Dudley'" <daviddu@cctexas.com>
Cc: "'EPICS core-talk'" <core-talk@aps.anl.gov>, "'EPICS Tech-Talk'" <tech-talk@aps.anl.gov>
Date: Wed, 7 May 2008 09:46:16 -0600
> 1. Is there a method or application anywhere that can generate a list of
> the channels on a remote IOC?  I mean, a program I can point at the
> IOC's address and have it generate a list of all the channels on that
> unit?

>From my perspective...

Presumably, the IOC should when it boots contact a list of (possibly
redundant) servers who know about hierarchical names providing to each a
complete list of the IOC's PV names. The protocol might have some requests
like this.

O define an object name specifying its type
O undefined an object name
O define a type name, specifying the types of its members and or its
interfaces
O undefined a type

Presumably there are already some portable open source name resolution
systems that provide this type of functionality.

No matter how it gets implemented, a feature addressing the type of things
that David is needing to implement _should_ be on the list for addition to
EPICS base.

Jeff

> -----Original Message-----
> From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov]
> On Behalf Of David Dudley
> Sent: Tuesday, May 06, 2008 8:27 PM
> To: tech-talk@aps.anl.gov
> Subject: Listing channels
> 
> Got 3 little questions:
> 
> 1. Is there a method or application anywhere that can generate a list of
> the channels on a remote IOC?  I mean, a program I can point at the
> IOC's address and have it generate a list of all the channels on that
> unit?
> 
> 2. Does SDDS require X in order to compile?  It's a given that SDDSPlot
> is probably going to need X, but most of the apps don't have GUI's, so
> must X be available in order to compile them?  If not, how do you
> generate the non-X programs?
> 
> 3. Is there a program that will extract a portion of an SDDS file?  In
> order to use SDDS for archiving (which it looks like it might be very
> useful for), it's going to have to run forever on the IOC unit.  If I
> need to generate a dataset from a SDDS datafile, how do I pull out just
> the period (say... everything from yesterday, midnite to midnite) from a
> file that has much, much more information in it (days, weeks, or months
> ...)?  I can come up with stuff to cause it to restart, say once a week,
> but how do I pull out a subset of information?
> 
> David Dudley


Replies:
Re: Listing channels Noboru Yamamoto

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